УСТРОЙСТВО И СПОСОБ НАЗНАЧЕНИЯ АНТЕНН ДЛЯ СИСТЕМЫ СОТОВОЙ МОБИЛЬНОЙ СВЯЗИ

Изобретение относится к системам мобильной связи и предназначено для увеличения производительности системы посредством использования изменяющейся по частоте характеристики канала. Изобретение раскрывает в частности способ для эффективного выбора и назначения антенн, который включает в себя передачу на пользовательское оборудование (UE) информации, указывающей конфигурацию множества Опорных сигналов информации о статусе канала (CSI-RS) посредством относящейся к UE сигнализации во время попытки первоначального доступа с помощью UE; прием от UE результатов измерения CSI-RS, указывающих сконфигурированные CSI-RS, передачу CSI-RS, соответствующих набору доступных распределенных портов (D-порты) на основе информации об уровне принятого сигнала, включенной в результаты измерения CSI-RS, и определение CSI-RS набора выбранных D-портов для использования в связи на основе информации обратной связи, принятой от UE. 5 н. и 15 з. п. ф-лы, 8 ил, 1 табл.

СПОСОБ УПРАВЛЕНИЯ ПЕРЕДАЧЕЙ ДАННЫХ ПО НИСХОДЯЩЕМУ КАНАЛУ С ИСПОЛЬЗОВАНИЕМ ТЕХНОЛОГИИ MIMO И БАЗОВАЯ СТАНЦИЯ

Изобретение относится к области беспроводной связи и используется для сочетания различных способов управления передачей в технологии MIMO с каналами передачи с учетом состояния нисходящих физических каналов и позволяет повысить эффективность связи всей системы путем сочетания оптимальных технологий управления MIMO-передачей. Способ управления передачей в нисходящем канале от базовой станции с несколькими антеннами к мобильной станции с несколькими антеннами включает шаги: применение MIMO-разнесения без обратной связи в одном или нескольких общих каналах управления, канале MBMS и канале управления L1/L2 и применение MIMO-мультиплексирования с обратной связью и/или MIMO-разнесения в общем канале данных. 2 н. и 26 з.п. ф-лы, 22 ил.

ИСПОЛНЕНИЕ ОПОРНОГО СИГНАЛА ДЛЯ LTE A

Изобретение относится к системам беспроводной связи, а конкретнее к использованию опорного сигнала для поддержки унаследованного пользовательского оборудования LTE А, и предназначено для повышения производительности за счет отправления сигнала несколько раз по разным передающим антеннам. Изобретение раскрывает системы и методологии, которые обеспечивают создание антенных портов, которые соответствуют двум или более группам пользовательского оборудования (UE). Рассматриваемое изобретение может организовать две или более группы пользовательского оборудования и сигнализировать соответствующий антенный порт каждой из двух или более групп. Рассматриваемое изобретение дополнительно может передать информацию отображения, опорный сигнал или задержку, имеющую отношение к линейной комбинации, чтобы идентифицировать антенные порты. На основе такой переданной информации можно декодировать опорный сигнал, чтобы идентифицировать каждый антенный порт. 12 н. и 72 з.п. ф-лы, 11 ил.

СПОСОБ И УСТРОЙСТВО ДЛЯ ВЫБОРА ВИРТУАЛЬНЫХ АНТЕНН

Описываются технологии для передачи данных от виртуальных антенн вместо физических антенн. Техническим результатом является эффективное использование мощности передачи, доступной для передающих антенн. Для этого каждая виртуальная антенна может отображаться на некоторые или на все физические антенны с помощью различных отображений. Оценивается эффективность разных наборов, по меньшей мере, из одной виртуальной антенны на основании одного или более показателей, таких как качество сигнала, пропускная способность, общая скорость, и так далее. Для использования выбирается набор виртуальных антенн с наилучшей эффективностью. Если выбор виртуальных антенн выполняется принимающим устройством, то информация о состоянии канала для выбранного набора виртуальных антенн может быть отправлена на передающее устройство. Информация о состоянии канала может переносить данные о выбранной виртуальной антенне (антеннах), качестве сигнала или скорости (скоростях) для выбранной виртуальной антенны (антенн), ...

СПОСОБ И УСТРОЙСТВО В СИСТЕМЕ БЕСПРОВОДНОЙ СВЯЗИ

... 1. Способ повторной передачи данных в режиме гибридного автоматического запроса повторной передачи, HARQ, в многоантенной системе беспроводной связи, осуществляемый пользовательским оборудованием, UE, причем упомянутый способ содержит этапы, на которыхпринимают (S30) информацию обратной связи по квитированию/отрицательному квитированию, ACK/NACK, относящуюся к данным, передаваемым в двух потоках данных: первичном потоке и вторичном потоке, причем упомянутая информация обратной связи по ACK/NACK включает в себя ACK/NACK, связанное с данными первичного потока, и ACK/NACK, связанное с данными вторичного потока; иповторно передают (S50) после снижения ранга от режима передачи ранга 2, в котором данные передаются в первичном потоке и вторичном потоке, до режима передачи ранга 1, в котором данные передаются в первичном потоке и в котором только один поток доступен для передачи, данные, связанные с NACK из вторичного потока, в первичном потоке.2. Способ по п. 1, причем упомянутый способ содержит ...

БАЗОВАЯ СТАНЦИЯ, ПОЛЬЗОВАТЕЛЬСКОЕ УСТРОЙСТВО И СПОСОБ УПРАВЛЕНИЯ СВЯЗЬЮ

... 1. Базовая станция в системе радиосвязи, в которой применяется разнесение передачи в восходящих линиях связи, а устройство пользователя, содержащее множество антенн, переключает антенны в соответствии с периодом переключения антенн, передаваемым с базовой станции, и передает опорный сигнал в восходящей линии связи, включающая в себя модуль измерения опорного сигнала, выполненный с возможностью измерения уровня приема опорного сигнала; модуль определения периода переключения, выполненный с возможностью определения периода переключения антенн при передаче опорного сигнала на основе уровня приема, измеренного модулем измерения опорного сигнала; и передающий модуль, выполненный с возможностью передачи периода переключения антенн, определенного модулем определения периода переключения. ! 2. Базовая станция по п.1, отличающаяся тем, что включает в себя таблицу, содержащую соответствие между уровнями приема опорного сигнала и периодами переключения антенн при передаче опорного сигнала зондирования ...

СПОСОБ УПРАВЛЕНИЯ ПЕРЕДАЧЕЙ ДАННЫХ ПО НИСХОДЯЩЕМУ КАНАЛУ С ИСПОЛЬЗОВАНИЕМ ТЕХНОЛОГИИ MIMO И БАЗОВАЯ СТАНЦИЯ

... 1. Способ управления передачей в нисходящем канале от базовой станции с несколькими антеннами к мобильной станции с несколькими антеннами, включающий следующие стадии: ! применение MIMO-разнесения без обратной связи в одном или нескольких общих каналах управления, канале MBMS и канале управления L1/L2; и ! применение MIMO-мультиплексирования с обратной связью и/или MIMO-разнесения в общем канале данных. ! 2. Способ управления передачей в нисходящем канале по п.1, отличающийся тем, что: ! MIMO-мультиплексирование включает перемножение вектора предкодирования с передаваемым сигналом и ! при передаче общего канала данных количество потоков при MIMO-мультиплексировании и вектор предкодирования для каждого из потоков определяются для пользователя с передачей сосредоточенного типа, которому выделяется блок ресурсов, включающий несколько непрерывно расположенных поднесущих, на основе состояния канала этого блока ресурсов. ! 3. Способ управления передачей в нисходящем канале по п.1, отличающийся ...

ИСПОЛНЕНИЕ ОПОРНОГО СИГНАЛА ДЛЯ LTE A

... 1. Способ, используемый в системе беспроводной связи, содержащий этапы, на которых: ! идентифицируют, по меньшей мере, две группы пользовательского оборудования (UE); ! сигнализируют разное количество входов антенн, по меньшей мере, двум группам UE; и ! создают входы антенн, соответствующие каждой группе UE, причем каждый вход антенны включает в себя подмножество некоторого количества физических передающих антенн, и количество входов антенн равно количеству входов антенн, сигнализированных той группе UE. ! 2. Способ по п.1, в котором некоторые входы антенн для другой группы UE являются одинаковыми. ! 3. Способ по п.1, в котором линейная комбинация применяется к физическим антеннам для получения некоторых входов антенн. ! 4. Способ по п.3, в котором линейная комбинация выбирается для преобразования разнесения передачи в частотное разнесение. ! 5. Способ по п.3, в котором линейная комбинация зависит от частоты. ! 6. Способ по п.3, в котором линейная комбинация является разнесением с циклической ...

ПРОТОКОЛ ПОДГОТОВКИ ВЫБОРА АНТЕНН ДЛЯ БЕСПРОВОДНОЙ МЕДИЦИНСКОЙ АППАРАТУРЫ

... 1. Устройство визуализации, содержащее: ! секцию главной установки, которая содержит антенную систему с множеством антенных позиций и, по меньшей мере, одной антенной (26'); ! беспроводное локальное устройство (22), расположенное по соседству с субъектом в области визуализации секции главной установки, причем беспроводное локальное устройство (22) содержит беспроводной приемопередатчик (24) для беспроводной связи с, по меньшей мере, одной антенной (26) главной установки; ! модуль (40a) управления антенной, который предписывает передачу пакетов запроса подготовки из антенны (26') главной установки; и, ! процессор беспроводного устройства (22), который реагирует на прием пакета запроса подготовки заданием приемопередатчику (24) локального устройства передать пакет подготовки выбора антенны в антенну (26') главной установки; ! процессор (40b) оценки данных, который оценивает пакет подготовки выбора антенны для проверки того, удовлетворяет ли упомянутый пакет критериям связи, причем, модуль ...

Drahtloses Kommunikationssystem unter Verwendung von verteilten umschaltbaren Antennen

Kommunikationsystem mit flexibler Sendekonfiguration

Mobile communication

Wireless communications methods and apparatus

MMSE reception of DS-CDMA with transmit diversity

A pilot signal enters a first MMSE receiver (201) and a second signal enters a second MMSE receiver (202). The first MMSE receiver (201) performs a channel estimate for the received pilot signal, determines a mean-square error of the pilot signal, and operates to minimize the mean-square error of the pilot estimate by constantly updating a weighting vector. An estimate of the pilot channel exits the first MMSE receiver (201). The MMSE weighting vector (206) is also fed into the second MMSE receiver (202) and is applied to the second channel. Symbol estimates (or in other embodiments, chip estimates) exit the second MMSE receiver (202) and enter channel circuitry (204), where normal channel processing occurs.

Digital radio communication system

Feedback of a digital signal to determine latency mismatch error response of the transceiver signal path of an antenna array element

A network element 300 for a wireless communication system to couple 302 at least one base station to an antenna array 330. The network element 300 comprises a number of independent transceiver circuits 312 coupled to respective antenna elements 328 of the antenna array 330 and logic for applying a complex digital signal to at least one transceiver signal path of a transceiver circuit 312. A feedback path 363 provides feedback of the complex digital signal to allow determination of latency mismatch error response of the at least one transceiver signal path to be used in further adjustment of a transceiver signal. Delay logic (610 fig.6) is arranged to receive a complex digital signal and provide a modified representation of the received complex digital signal in response to the latency mismatch error response of the at least one transceiver signal path.

PROCEDURE FOR THE CONTROLLING OF THE SIGNAL TRANSMISSION IN A SYSTEM WITH SEVERAL ENTRANCES AND SEVERAL EXITS

ADAPTIVE FEEDBACK FOR MIMO OF COMMUNICATION SYSTEMS

MINUTES-STEERED ANTENNA SELECTION

PROCEDURE AND SYSTEM FOR THE SELECTION OF ANTENNAS IN OFDMA NETWORKS

TRANSMISSION DIVERSITY

SYSTEM AND PROCEDURE FOR SENDING AND RECEIVING FROM INFORMATION IN A MULTI-PATH ENVIRONMENT WITH DIVERSITY

SENDENANTENNENDIVERSITY

TDM SPACE DIVERSITY SYSTEM

Method and arrangements for communication of channel quality information in a telecommunications system

AUTOMATIC ANTENNA SELECTION FOR MESH BACKHAUL NETWORK NODES

Mobile terminal initiated and assisted antenna selection

Radio communication device and transmission antenna switching method

Transmit diversity method and system

MOBILE TERMINAL INITIATED AND ASSISTED ANTENNA SELECTION

In a cellular, broadband radio access network, such as a High Performance Local Area Network Type 2 (HIPERLAN/2), which employs multiple antennas per base station, the process of identifying and selecting the most appropriate base station antenna to support a given mobile terminal may be accomplished more effectively by allowing the mobile terminal to initiate antenna selection and, thereafter, to identify the most appropriate one of the multiple base station antennas. By utilizing the mobile terminal in this capacity, the process of antenna selection can be accomplished more effectively even if there is relatively little uplink communication between the mobile terminal and its corresponding base station.

ANTENNA ALLOCATION APPARATUS AND METHOD FOR CELLULAR MOBILE COMMUNICATION SYSTEM

A method and apparatus for selecting and allocating antennas efficiently are provided.. The method includes transmitting, to a User Equipment (UE), information indicating a configuration of a plurality of Channel Status Information Reference Signals (CSI-RSs) through UE specific signaling during an initial access attempt with the UE; receiving, from the UE, CSI-RS measurement results indicating configured CSI-RSs; transmitting CSI-RSs corresponding to a set of available distributed ports (D-ports) based on received signal strength information included in results of the CSI-RS measurement; and determining a CSI-RS of a selected D-port set for use in communications based on feedback information received from the UE.

WIRELESS COMMUNICATION SYSTEM USING DISTRIBUTED SWITCHED ANTENNAS

Increased coverage and macro diversity from a single base station in a wireless communication system by having a base station coupled to N antennas is described. Increased coverage and macro diversity are achieved by transmitting from the base station N control messages each via one of the antennas, and transmitting a data message addressed to a mobile unit via a particular one of the antennas previously assigned to the mobile unit for an active call. The mobile unit receives the control messages and the data message and analyzes the control messages to identify from the antennas a best antenna. * The mobile unit then transmits to the base station a new antenna request identifying the best antenna in an uplink control slot of a frame. The uplink control field is associated with the particular one of the antennas. The base station uses the best antenna to transmit subsequent data messages addressed to the mobile unit. A random access technique, to allow mobile units that are going from an ...

A METHOD AND APPARATUS FOR ENHANCING COMMUNICATION RECEPTION AT A WIRELESS COMMUNICATION TERMINAL

A system provides transmit diversity with feedback to enhance the reception of communication signals at a wireless communication terminal. Multiple antennae are provided at the base station. The multiple antennae transmit multi-carrier information signals such as OFDM including pilot tones. The wireless communication terminal receives the pilot tones and performs processing on those tones to detect the relationship between the information signals transmitted from the various antennae of the base station. A feedback signal, based on the comparison of the pilot tones communicates back to the base station information about the channels of the respective transmit antennae to the terminals. The base station modifies the transmission processing associated with the various transmit antennae based upon the feedback signal. The modified processing improves the reception of the information signals at the wireless communication terminal.

Communication device and space-division duplex method thereof

The application discloses a communication device and a space-division duplex method thereof, wherein the communication device includes at least one first channel, at least one second channel, and at least two antennae which are independent of the first channel and the second channel. The method includes the following steps: acquiring state information of a channel between the communication device and an opposite terminal; according to the state information of the channel, selecting a first antenna corresponding to the first channel and a second antenna corresponding to the second channel, from the antennae; connecting the first channel with the first antenna and connecting the second channel with the second antenna; at the same time and on the same frequency resource, using the first channel and the first antenna connected with the first channel to transmit signals and using the second channel and the second antenna connected with the second channel to receive signals, or using the first ...

A method of transmitting at least one sub-packet based on feedback information in a wireless communication system

A method of transmitting subsequent sub-packets in a wireless communication system using a hybrid automatic request (HARQ) technique is disclosed. The method includes receiving feedback information from at least one receiving end, transmitting a transmit packet via at least one overhead channel, wherein the transmit packet includes information on carrier and antenna combination selected for subsequent transmission, and transmitting at least one sub-packet according to the selected carrier and antenna combination.

METHOD FOR SELECTING AN ANTENNA

Procédé de sélection d'une antenne dans un système comprenant un premier dispositif et au moins un deuxième dispositif, le système formant un réseau de communication de type TDMA dans lequel chaque communication se fait dans des trames, au moins le premier dispositif comprenant une pluralité d'antennes couvrant chacune un secteur prédéfini au voisinage de ladite pluralité. Les trames utilisées dans ledit système sont organisées en une succession de groupes de trames consécutives, chaque groupe étant organisé suivant une structure de groupe associant chaque trame à un couple formé d'une antenne du premier dispositif et d'un second dispositif, chaque couple possible étant associé à une trame différente du groupe en fonction d'une position de ladite trame dans ledit groupe. Le procédé comprend pour chaque dispositif comprenant une pluralité d'antennes : obtenir (62, 66, 73) une information représentative d'une qualité de communication entre une antenne dudit dispositif et une antenne du premier ...

Mobile communications system digital word transmission/reception having radio channel state determined and high priority words relatively good channel transmitted/low priority relatively poor channels transmitted.

L'invention concerne un appareil et un procédé d'émission/ réception de données utilisant un groupement d'antennes (90, 92, 94, 96) dans un système de communications du service mobile. Un Noeud B mesure un état d'émission de chaque antenne d'émission, classe les données d'émission en fonction d'une priorité et transmet à un équipement d'utilisateur des données à haute priorité par une antenne d'émission ayant un état d'émission relativement bon et des données à basse priorité par une antenne d'émission ayant un état d'émission relativement mauvais. Domaine d'application : communications du service mobile, etc.

ANTENNA SWITCHING IN A CLOSED LOOP TRANSMIT DIVERSITY SYSTEM

METHOD AND APPARATUS FOR PROVIDING ANTENNA DIVERSITY IN A WIRELESS COMMUNICATION SYSTEM

TRANSMITTING DIVERSITY SYSTEM AND METHOD THEREOF

다중 안테나 통신 시스템에서의 안테나 개수 결정 방법 및 장치

... 송신 장치의 소비 파워를 계산하는 단계; 상기 송신 장치의 채널 용량을 계산하는 단계; 및 상기 소비 파워와 채널 용량을 이용하여 상기 송신 장치의 에너지 효율을 최대화하는 안테나 개수를 결정하는 단계를 포함하는 안테나 개수 결정 방법이 개시된다.

A method of transmitting at least one sub-packet based on feedback information in a wireless communication system

ADAPTIVE MODULATION APPARATUS AND A METHOD THEREOF USING A MULTIPLE ANTENNA SELECTIVE METHOD AND USING A PLURALITY OF ANTENNAS

PURPOSE: An adaptive modulation apparatus and a method using a multiple antenna selective method and using a plurality of antennas are provided to minimize the frequency efficiency and the antenna selection delay by communicating data according to the channel environment of an antenna. CONSTITUTION: A multiple antenna transmission apparatus(101) selects one transmission antenna among a plurality of transmission antennas(103). The purpose transmission rate of the selected transmission antenna is determined. A multiple antenna receiving device(105) selects one RX-antenna among a plurality of RX-antennas(107). By utilizing the selected RX-antenna, the purpose transmission rate is received from the multiple antenna transmission apparatus. The channel status value of RX-antenna is measured based on the received purpose transmission rate. The channel status value is the received signal power, SNR(Signal to Noise Ratio), and the value of LLR(Log Likelihood Ratio). © KIPO 2009 ...

METHOD FOR SELECTING AN ANTENNA AND TRANSMITTING DATA IN THE MIMO WIRELESS LAN ENVIRONMENT, CAPABLE OF MAXIMIZING DATA TRANSMISSION EFFICIENCY THROUGH ANTENNA DIVERSITY

PURPOSE: A method for selecting an antenna and transmitting data in the MIMO wireless LAN environment is provided to reduce the cost required for implementing a system by simplifying the hardware structure of an RF- chain. CONSTITUTION: A method for transmitting data to an access point from a plurality of stations in an MIMO wireless LAN system includes the following steps of: sensing channel states for a plurality of transmission antennas in each station(S210); selecting at least one of transmission antennas according to the sensed channel states(S220); and transmitting a data frame to the access point through the selected at least one antenna(S230). © KIPO 2009 ...

균일한 ＷＬＡＮ 다중-ＡＰ 물리 계층 방법

... 섹터화된 송신에서의 트레이닝 및 피드백에 대한 방법 및 장치가 개시된다. IEEE 802.11 스테이션은 AP로부터 섹터 트레이닝 공지 프레임을 수신할 수 있다. 스테이션은 그 후 AP로부터 복수의 트레이닝 프레임들을 수신할 수 있으며, 여기에서 복수의 트레이닝 프레임들 각각은 짧은 프레임간 간격(short interframe space; SIFS)만큼 분리되고, 복수의 트레이닝 프레임들 각각은 상이한 섹터화된 안테나 패턴을 이용하여 수신된다. 스테이션은 복수의 트레이닝 프레임들에 기초하여 섹터를 표시하는 섹터 피드백 프레임을 생성할 수 있다. 스테이션은 섹터 피드백 프레임을 AP에 전송할 수 있다. 섹터 피드백 프레임은 섹터화된 송신에 등록하기를 원하다고 표시할 수 있다. 대안으로, 섹터 피드백 프레임은 섹터들을 변경하기를 원한다고 표시할 수 있다.

método e dispositivo para relatar falha no raio de célula de servidor secundário e meio de armazenamento

A method and apparatus for achieving transmit diversity and spatial multiplexing using antenna selection based on feedback information

A method of achieving transmit diversity in a wireless communication system is disclosed. The method comprises encoding and modulating data stream based on feedback information, demultiplexing symbols to at least one encoder block, encoding the demultiplexed symbols by the at least one encoder block, transforming the encoded symbols by at least one inverse fast Fourier transform (IFFT) block, and selecting antennas for transmitting the symbols based on the feedback information.

Method and system for providing antenna diversity

An antenna switch diversity algorithm, and systems and methods to provide antenna diversity by implementing the algorithm in, for example, an IEEE 802.11a compliant environment, are presented. In accordance with the algorithm, one antenna of at least two antennas is designated as a default antenna at a communications device that sends and receives transmit and receive packets. The default antenna designation is changed depending on long-term and short-term learning processes implemented in, for example, software and hardware. The long-term and short-term learning processes analyze packet transmission and reception results of the antennas. The antenna switch diversity algorithm is applicable to multiple antennas.

Antenna switching method of wireless communication system

Antenna switching diversity

An antenna switching diversity radio communication system includes a base station and a radio terminal. Transmission and reception is separated in both time and frequency in both base station and radio terminal. Reception quality uplink is measured(S1) on a set of several antennas belonging to the base station. The base station stores and later retrieves this quality measure for selecting (S3) one of the antennas for uplink reception. The radio terminal measures (S2) and reports (S4) downlink reception quality to the base station, which stores (S5) this information to later select (S6) one of the antennas for downlink transmission.

METHOD AND SYSTEM FOR SELECTING ANTENNAS IN OFDMA NETWORKS

A method and a system for selecting antennas in an orthogonal frequency division multiple access (OFDMA) network. The network includes a base station and mobile stations. The mobile station includes multiple antennas. The base station and the mobile stations communicate with each other using frames. The base station transmits a down-link (DL) subframe of the frame to the mobile station. The DL subframe allocates one or more symbols and one or more subcarriers of an up-link (UL) subframe of the frame for antenna selection signals. The mobile station transmits the UL subframe including the antenna selection signals at the allocated subcarriers and symbols to the base station. Then, the base station selects a subset of the antennas based on the antenna selection signals.

RADIO BASE STATION APPARATUS AND RADIO COMMUNICATION METHOD

In FDD wireless communication, a terminal measures reception quality and reports on the mesurement results to a base station, while the base station switches transmission antennas based on the report of the reception quality. As a result, a proper transmission antenna can be selected on the basis of the received signal in FDD communication.

MMSE RECEPTION OF DS-CDMA WITH TRANSMIT DIVERSITY

A pilot signal enters a first MMSE receiver (201) and a second signal enters a second MMSE receiver (202). The first MMSE receiver (201) performs a channel estimate for the received pilot signal, determines a mean-square error of the pilot signal, and operates to minimize the mean-square error of the pilot estimate by constantly updating a weighting vector. An estimate of the pilot channel exits the first MMSE receiver (201). The MMSE weighting vector (206) is also fed into the second MMSE receiver (202) and is applied to the second channel. Symbol estimates (or in other embodiments, chip estimates) exit the second MMSE receiver (202) and enter channel circuitry (204), where normal channel processing occurs.

MOBILE RADIO COMMUNICATIONS APPARATUS AND BASE STATION THEREOF, AND METHOD OF ANTENNA SELECTION

Mobile radio communications apparatus having a plurality of transmitting antennas for performing transmission upon selecting whichever of these plurality of antennas is appropriate, wherein the appropriate antenna can be selected even in a case where an object that influences antenna characteristics is in close proximity to the antenna is disclosed. The level of reflected-waves from whichever of the antennas (3, 4) has been selected by a switch 44 is measured by a reflected-wave measurement circuit (48). If the amount of level variation exceeds a predetermined value, the other antenna is used by changing over the switch (44).

METHOD FOR FEEDBACK OF CORRELATION OF BEAMS IN WIRELESS COMMUNICATION SYSTEM AND USER EQUIPMENT

A method of beam information feedback in a wireless communication system is disclosed including transmitting, from a base station (BS) to a user equipment (UE), reference signals using multiple beams, and transmitting, from the UE to the BS, first feedback information that indicates at least one of a first correlation level between a pair of beams within each of beam groups and a second correlation level between a pair of the beam groups. The multiple beams are grouped into the beam groups.

Adaptive method of transmitting and receiving a signal in a multi-antenna system, corresponding transmission and reception devices, computer program products and signal

A method is provided for receiving a signal, corresponding to a data signal transmitted by a transmitter to a receiver via a transmission channel. The method includes the following steps: analyzing the signal received, delivering an information item representative of the transmission channel; determining, periodically and/or as a function of a variation of the transmission channel: at least one distribution of the transmission antennas into at least one group of at least one antenna as a function of the information item representative of the transmission channel, wherein at least one group includes at least two transmission antennas for at least one of the determinations; and specific efficiencies assigned respectively to each of the groups of antennas for each distribution as a function of the information item, and transmitting to the transmitter a parameterization signal defining the at least one distribution and the specific efficiencies.

Beam and power allocation method for MIMO communication system

The present invention provides the multiuser Multiple-Input Multiple-Output (MIMO) systems with a feedback method which includes measuring, at the terminal, received Signal to Noise Ratios (SNRs) for all transmit antennas, selecting one of precoding matrixes, which has best SNRs, retrieving an index mapped to the selected preceding matrix from a predetermined mapping table, and transmitting the index with the SNRs of the selected precoding matrix. In the present invention, it is possible to reduce feedback information amount without degradation of the sum rate performance of the system since the feedback information is transmitted in a form of index implying appropriate precoding matrix and corresponding SNRs.

Uplink control channel beam switch procedure

Methods, systems, and devices for wireless communications are described. One method may include receiving, by a user equipment (UE) in a downlink shared data channel, a beam switch command instructing the UE to switch from a first uplink control beam to a second uplink control beam. The UE may select an uplink control beam to transmit acknowledgment feedback based on whether decoding the beam switch command is successful, and transmit, in an uplink control channel via the selected uplink control beam, the acknowledgment feedback indicating whether decoding the beam switch command was successful.

Method and System for Generating Antenna Selection Signals in Wireless Networks

Embodiments of the invention describe a method for antenna selection (AS) in a wireless communication network, the network comprising user equipment (UE), wherein the UE comprises a plurality of subsets of antennas including a first subset of antennas and a second subset of antennas, and wherein the UE is configured to transmit a sounding reference signal (SRS) from a subset of antennas at a time. The method transmits a first SRS from the first subset of antennas, transmits a second SRS from the second subset of antennas, receives, in response to the transmitting the first SRS and the second SRS, information identifying an optimal subset of antennas from the first subset of antennas and the second subset of antennas, and transmits user data from the optimal subset of antennas.

Method and apparatus for power control of sounding reference signal (SRS) transmission

Methods and apparatus for sounding reference signal (SRS) power control for a wireless transmitter/receiver unit (WTRU) are disclosed. These methods and apparatus include methods and apparatus for carrier-specific and carrier-common SRS power control in WTRUs that utilize carrier aggregation techniques. These methods and apparatus also include methods and apparatus for SRS power control in WTRUs utilizing both carrier aggregation and time division multiplexing (TDM) techniques. Additionally, these methods and apparatus include methods and apparatus for SRS power control for WTRUs utilizing multiple input multiple output MIMO operation. Methods and apparatus for SRS overhead reduction and power management in a WTRU are also disclosed.

Apparatus and method for determining transmit/receive antenna in communication system using multiple antennas

Disclosed are an apparatus and a method for determining a transmit/receive antenna in a Multiple Input Multiple Output (MIMO) communication system. At least one sub-channel matrix including transmit antenna information and receive antenna information is generated. From the at least one sub-channel matrix, a sub-channel matrixhaving a maximum value Frobenius norm is determined. The transmit and receive antenna information are then extracted from the determined sub-channel matrix.

WIRELESS COMMUNICATION SYSTEM, BASE STATION, MOBILE STATION, BASE STATION CONTROL PROGRAM, AND MOBILE STATION CONTROL PROGRAM

An access method, transmission power, an antenna to be used, and the number of antennas are controlled in consideration of a PH indicating a transmission power headroom. A wireless communication system which includes a base station and a mobile station and in which the mobile station performs data transmission to the base station by allocating a transmission signal converted into a frequency signal to contiguous frequency bands or non-contiguous frequency bands divided into a predetermined number, wherein, when retransmission occurs in the data transmission the mobile station has performed by allocating the transmission signal converted into the frequency signal into the non-contiguous frequency bands, the base station determines a transmission power headroom of the mobile station in the allocation of the transmission signal to the non-contiguous frequency bands, and, if a result of the determination shows that there is not a transmission power headroom, the base station instructs the mobile ...

METHOD AND SYSTEM FOR USE OF QUADRATURE HYBRIDS FOR CLOSED AND OPEN LOOP BEAM FORMING TRANSMIT DIVERSITY

METHOD FOR OPERATING A RADIO COMMUNICATION SYSTEM, RECEIVER STATION AND SENDING STATION FOR A RADIO COMMUNICATION SYSTEM

Wireless system with transmitter with multiple antennas and combining open loop and closed loop transmit diversity

DIVERSITY TRANSMISSION METHOD AND SYSTEM

METHOD AND SYSTEM FOR HIGH-SPEED FADING PACKET DIVERSITY TRANSMISSION

PROBLEM TO BE SOLVED: To reduce the influence of fading by incorporating a modulator, a multiplier, and a plurality (M) of antennas for transmitting received phase offsets and modulated information packets in a transmitter. SOLUTION: A transmitter 50A is provided with a modulator 67, a plurality (M) of multipliers 68, and a plurality (M) of transmission antennas 69 composed of power amplifier circuits. The modulator 67 is a 4-DPSK modulator and modulates information packets received from an information source 60 together with carrier signals. The M sets of multipliers 68 are used for giving M sets of fixed-phase offsets to modulated information packets transmitted from the M sets of antennas 69. Therefore, the M sets of fixed-phase offsets is given respectively to M pieces of packets in a packer stream together with channel order M and the influence of the fading of a plurality of paths is reduced. COPYRIGHT: (C)1996,JPO ...

RADIO SYSTEM PROVIDED WITH PLURAL TRANSMISSION ANTENNAS FOR CONNECTING OPEN LOOP AND CLOSED LOOP TRANSMISSION DIVERSITIES

PROBLEM TO BE SOLVED: To eliminate the problem of a multi-path, without complicating a configuration by combining the communication techniques of open loop and closed loop diversities and exchanging a plurality of signals which are generated in an encoding circuit. SOLUTION: A base station BST is provided with two pairs of four antennas AT1-AT4, an open loop diversity system is adopted by the pairs of antennas AT1, AT2 and AT3, AT4, and a closed loop diversity system is adopted to parts between the pairs. In an open-loop communication function, signals S1 and S2 having a weight W1 are respectively transmitted from a space time block encoding diversity STTD encoder 44 by times T' and 2T' through the use of the antenna AT1 and also the signal S having a weight W2 and negative and positive coupling values are respectively transmitted from the STTD encoder 46 by the time T' and 2T' through the use of the antenna AT2. In a closed-loop function, a user UST extracts the weights W1 and W2 from ...

БАЗОВАЯ СТАНЦИЯ, ПОЛЬЗОВАТЕЛЬСКОЕ УСТРОЙСТВО И СПОСОБ ПЕРЕДАЧИ СИГНАЛА, ИСПОЛЬЗУЕМЫЙ В СИСТЕМЕ МОБИЛЬНОЙ СВЯЗИ

Изобретение относится к области мобильной связи, а именно к базовой станции, пользовательскому устройству и способу, применяемым в системах мобильной связи, использующих ASTD (Antenna Switching Transmit Diversity, разнесение при передаче с переключением антенн) с обратной связью. Техническим результатом является улучшение в частоте ошибок при передаче информации о выборе антенны из базовой станции в пользовательское устройство в случае применения способа ASTD с обратной связью. Для этого базовая станция содержит блок хранения, выполненный с возможностью хранения информации о качестве, отражающей состояния канала для различных передающих антенн пользовательского устройства в заранее заданной полосе частот, включающей в себя несколько элементов ресурсов; блок планирования, выполненный с возможностью генерации информации планирования, отражающей назначение элементов ресурсов на основе информации о качестве; и блок передачи, выполненный с возможностью передачи в пользовательское устройство ...

СПОСОБ И УСТРОЙСТВО В СИСТЕМЕ БЕСПРОВОДНОЙ СВЯЗИ

Изобретение относится к средствам повторной передачи данных в режиме гибридного автоматического запроса повторной передачи. Технический результат заключается в обеспечении экономичных по времени и устойчивых передач и повторных передач HARQ в случае снижения ранга в многоантенной системе беспроводной связи. Указанный результат достигается за счет выполнения этапов способа повторной передачи данных в режиме гибридного автоматического запроса повторной передачи, HARQ. В многоантенной системе беспроводной связи посредством пользовательского оборудования UE: принимают информацию обратной связи по квитированию/отрицательному квитированию, ACK/NACK, относящуюся к данным, передаваемым в двух потоках данных: первичном потоке и вторичном потоке, причем упомянутая информация обратной связи по ACK/NACK включает в себя ACK/NACK, связанное с данными первичного потока, и ACK/NACK, связанное с данными вторичного потока; и повторно передают, после снижения ранга от режима передачи ранга 2, в котором данные ...

ЛИНЕЙНОЕ ПРЕДВАРИТЕЛЬНОЕ КОДИРОВАНИЕ ДЛЯ СИСТЕМЫ ДУПЛЕКСНОЙ ПЕРЕДАЧИ С ВРЕМЕННЫМ РАЗДЕЛЕНИЕМ

Изобретение относится к технике связи и может быть использовано для линейного предварительного кодирования в системах беспроводной связи с дуплексной передачей с временным разделением со многими входами и многими выходами (MIMO). Способ формирования явной и неявной обратной связи, относящейся к каналу прямой линии связи, для линейного предварительного кодирования заключается в том, что оценивают канал прямой линии связи, чтобы сформировать матрицу, осуществляют квантование части матрицы, чтобы выдать в результате явную обратную связь, и передают квантованные данные по каналу обратной линии связи, который обеспечивает неявную обратную связь, соответствующую оставшейся части матрицы, причем неявная обратная связь не является идентичной явной обратной связи, и при этом неявная обратная связь обеспечивает информацию о части матрицы, отличной от квантованной части. Технический результат - упрощение оценки прямого канала путем использования неявной и явной обратных связей. 10 н. и 29 з.п. ф-лы ...

УПРАВЛЕНИЕ РАДИОКАНАЛОМ В КОМБИНИРОВАННОЙ СОТЕ

Изобретение относится к области связи. Технический результат заключается в обнаружении со сравнительно высокой степенью надежности того, может ли пользовательский терминал осуществлять прием и использовать определенный нисходящий канал в определенном участке соты. Устройство (1) узла связи множественного доступа с кодовым разделением каналов (CDMA) содержит по меньшей мере два разделенных в пространстве антенных модуля (2, 3), по меньшей мере один радиомодуль (7) и по меньшей мере один блок (8) управления. Каждый антенный модуль (2, 3) имеет по меньшей мере одну соответствующую зону (5, 6) покрытия и соединен с центральным блоком (4). Блок (8) управления устроен так, чтобы изменять свойства передачи на пользовательский терминал (9) по меньшей мере первого антенного модуля (2), так, чтобы первым антенным модулем (2) в выделенном канале осуществлялась передача большей или меньшей мощности. Блок (8) управления выполнен с возможностью отслеживать принятые команды (10, 10') внутреннего цикла ...

СПОСОБ И УСТРОЙСТВО ДЛЯ ПЕРЕДАЧИ ПРИЕМА ДАННЫХ С ПОМОЩЬЮ АНТЕННОЙ РЕШЕТКИ В СИСТЕМЕ МОБИЛЬНОЙ СВЯЗИ

... 1. Способ передачи данных с передатчика, имеющего совокупность первых антенн, в приемник, имеющий совокупность вторых антенн, по многочисленным радиоканалам в системе мобильной связи, заключающийся в том, что определяют состояния радиоканалов и передают высокоприоритетные данные через первые антенны, имеющие сравнительно хорошие состояния каналов, а низкоприоритетные данные - через первые антенны, имеющие сравнительно плохие состояния каналов. 2. Способ по п.1, отличающийся тем, что радиоканалы являются каналами нисходящей линии связи. 3. Способ по п.1, отличающийся тем, что передатчик определяет состояния радиоканалов и передает информацию о состояниях каналов в приемник. 4. Способ по п.1, отличающийся тем, что приемник определяет состояния радиоканалов и передает информацию о состояниях каналов обратно в передатчик. 5. Способ по п.1, отличающийся тем, что дополнительно группируют данные, принятые через вторые антенны, в соответствии с состояниями каналов и демодулируют сгруппированные ...

СПОСОБ ДЛЯ ПЕРЕДАЧИ ДАННЫХ МЕЖДУ ПОЛЬЗОВАТЕЛЬСКИМ ОБОРУДОВАНИЕМ И БАЗОВОЙ СТАНЦИЕЙ В БЕСПРОВОДНОЙ РАДИОСЕТИ

Drahtloses Kommunikationssystem unter Verwendung von verteilten umschaltbaren Antennen

Verfahren und System zur Close-Loop-Sendestrahlformung in MIMO-Systemen mit begrenzter Rückkopplung

Verfahren, umfassend: Ausklammern von Phaseninformationen aus einer Strahlformungsmatrix und Senden von mindestens einem Parameter, der die Strahlformungsmatrix ohne die Phaseninformationen beschreibt.

Verfahren und Gerät zum senden und empfängen von Statusangaben des Abwartskanals in einem Mobilkommunikationssystem das selektive Sendediversität unterstutzt

Wireless communication methods and apparatus

Diversity for digital data transmission

A mobile transmitter for transmitting error protected digital data divided into blocks which are interleaved in time. Data is transmitted sequentially to a plurality of antennas 60 by switching transmission to each antenna for a period shorter than the duration of an interleaved block. At least one receiving antenna 50 is coupled to a receiver which incorporates an error protection decoder to extract the original digital data from the received signal. A summation means may be coupled with different delays to the receivers for combining received signals, includes means for simulating apparent antenna movement to reduce interference effects between receivers. The separation between antennas should be sufficient to allow error protection coding to extract the original data. The signal amplitudes at different antennae may be continuously altered to adjust relative phase and to maintain signal transmission in the absence of mulitpath. Switching between antennas may take place using a cross fade ...

Apparatus and method for transmitting and receiving data using an antenna array in a mobile communication system

Antenna switching method and method for transmitting and receiving signals for the same

A closed-loop antenna switching method, a reference signal allocating method, and a feedback signal transmitting method for the same are disclosed. Namely, by transmitting a reference signal via the plurality of transmitting antennas via the antenna switching for reference signal transmission for each prescribed multiple period of an antenna selection period, efficient antenna index information can be fed back. By setting an antenna switching period to a prescribed multiple of an antenna selection period, it is able to prevent power loss and data decoding performance degradation. And, the present invention includes transmitting a sounding reference signal (SRS) for each band selection period via at least one of the plurality of transmitting antennas and transmitting at least one data demodulation reference signal (DMRS) between the band selection periods via an antenna for not transmitting data by reference signal transmission antenna switching.

SEND DIVERSITY PROCEDURES AND SYSTEM

RADIO COMMUNICATION SYSTEM

FLEXIBLE MULTI-SECTOR MULTI-ANTENNA SYSTEM

PROCEDURE FOR THE ENTERPRISE OF A RADIO COMMUNICATION SYSTEM, A SLAVE STATION AS WELL AS A MASTER STATION FOR A RADIO COMMUNICATION SYSTEM

System and method for beam switching and reporting

A UE may select a first beam for communication with a base station. The UE may attempt, through the selected first beam, at least one RACH procedure with the base station. The UE may determine that the at least one RACH procedure failed with the base station. The UE may send, after a successful RACH procedure with the base station, information indicating that the at least one RACH procedure failed. In an aspect, the UE may select a new beam for communication with the base station after the determination that the at least one RACH procedure failed, and at least a portion of the successful RACH procedure may be performed through the selected new beam.

Data transmission method and radio system

Radio base station apparatus and radio communication method

Wireless communications system employing selective diversity transmission, method for selectively enabling diversity transmission, and a wireless telecommunications network employing the system or the method

TSTD APPARATUS AND METHOD FOR A TDD CDMA MOBILE COMMUNICATION SYSTEM

Disclosed a transmission apparatus in a CDMA mobile communication system. Transmission frames each have a plurality of time slots, and each of the time slots includes two data parts having the same length, a midamble intervening between the data parts, and a guard period for dividing the consecutive time slots. The transmission apparatus modulates the frames into a radio signal with a modulation signal and transmits the modulated radio signal using a plurality of antennas. A power amplifier amplifies the radio signal. A controller generates a switching control signal in a guard period of time slots of a frame associated with the radio signal amplified by the power amplifier. A switch switches the amplified radio signal from the power amplifier between a first and a second antenna in response to the switching control signal.

AUTOMATIC ANTENNA SELECTION FOR MESH BACKHAUL NETWORK NODES

Methods and devices related to wireless networking. A wireless device has multiple directional antennas and multiple backhaul radio modules which provide point to point wireless links with other wireless devices. Each radio module can use any one of the available directional antennas to link to one other routing device. Antennas are automatically selected for each wireless device by merely setting one device in a "hunt" mode and setting another device in a "listen" mode. Devices in a hunt mode cycle through the available antennas by sequentially transmitting transmit messages to devices in the listen mode using each of the available antennas in turn. Devices in the listen mode also cycle through their available antennas by sequentially "listening" for transmit messages. A listen mode device, receives transmit messages on each of its available antennas, and, after gathering the relevant data, determines which of its antennas is best suited for communicating with the hunt mode device. The ...

METHODS AND APPARATUS OF PROVIDING TRANSMIT AND/OR RECEIVE DIVERSITY WITH MULTIPLE ANTENNAS IN WIRELESS COMMUNICATION SYSTEMS

... ²²²Transmit and/or receive diversity is achieved using multiple antennas. In some ²embodiments, a single transmitter chain within a wireless terminal is coupled ²over time to a plurality of transmit antennas (312). At any given time, a ²controllable switching module (310) couples the single transmitter chain to ²one the plurality of transmit antennas. Over time, the switching module ²couples the output signals from the single transmitter chain to different ²transmit antennas. Switching decisions are based upon predetermined ²information, dwell information, and/or channel condition feedback information. ²Switching is performed on some dwell and/or channel estimation boundaries. In ²some OFDM embodiments, each of multiple transmitter chains is coupled ²respectively to a different transmit antenna. Information to be transmitted is ²mapped to a plurality of tones. Different subsets of tones are formed for and ²transmitted through different transmit chain/antenna sets simultaneously. The ²balance ...

MULTIPLE-INPUT, MULTIPLE-OUTPUT (MIMO) SYSTEMS WITH MULTIPLE TRANSMISSION MODES

... ²²²Techniques to transmit data on a number of transmission channels in a multi-²channel communication system using multiple transmission schemes requiring ²less channel-state information (CSI). These schemes may include a partial-CSI ²transmission scheme that transmits a single data stream on each transmit ²antenna selected for use and a "beam-forming" transmission scheme that ²allocates all transmit power to a single transmission channel having the best ²performance. Each transmission scheme may provide good or near-optimum ²performance for a specific range of operating conditions (or operating SNRs). ²These multiple transmission schemes may then be combined in a piece-wise ²fashion to form a "multi-mode" transmission scheme that covers the full range ²of operating conditions supported by the MIMO system. The specific ²transmission scheme to be used for data transmission at any given moment would ²then be dependent on the specific operating condition experienced by the ²system at that ...

AUTOMATIC ANTENNA SELECTION FOR MESH BACKHAUL NETWORK NODES

Methods and devices related to wireless networking. A wireless device has multiple directional antennas and multiple backhaul radio modules which provide point to point wireless links with other wireless devices. Each radio module can use any one of the available directional antennas to link to one other routing device. Antennas are automatically selected for each wireless device by merely setting one device in a "hunt" mode and setting another device in a "listen" mode. Devices in a hunt mode cycle through the available antennas by sequentially transmitting transmit messages to devices in the listen mode using each of the available antennas in turn. Devices in the listen mode also cycle through their available antennas by sequentially "listening" for transmit messages. A listen mode device, receives transmit messages on each of its available antennas, and, after gathering the relevant data, determines which of its antennas is best suited for communicating with the hunt mode device. The ...

METHOD AND APPARATUS FOR ALLOCATING RESOURCES IN A MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) COMMUNICATION SYSTEM

Techniques to schedule downlink data transmission to a number of terminals in a wireless communication system. In one method, one or more sets of terminals are formed for possible data transmission, with each set including a unique combination of one or more terminals and corresponding to a hypothesis to be evaluated. One or more sub-hypotheses may further be formed for each hypothesis, with each sub-hypothesis corresponding to specific assignments of a number of transmit antennas to the one or more terminals in the hypothesis. The performance of each sub-hypothesis is then evaluated, and one of the evaluated sub-hypotheses is selected based on their performance. The terminal(s) in the selected sub-hypothesis are then scheduled for data transmission, and data is thereafter coded, modulated, and transmitted to each scheduled terminal from one or more transmit antenna assigned to the terminal.

MULTIPLE-INPUT, MULTIPLE-OUTPUT (MIMO) SYSTEMS WITH MULTIPLE TRANSMISSION MODES

Techniques to transmit data on a number of transmission channels in a multi- channel communication system using multiple transmission schemes requiring less channel-state information (CSI). These schemes may include a partial-CSI transmission scheme that transmits a single data stream on each transmit antenna selected for use and a "beam-forming" transmission scheme that allocates all transmit power to a single transmission channel having the best performance. Each transmission scheme may provide good or near-optimum performance for a specific range of operating conditions (or operating SNRs). These multiple transmission schemes may then be combined in a piece-wise fashion to form a "multi-mode" transmission scheme that covers the full range of operating conditions supported by the MIMO system. The specific transmission scheme to be used for data transmission at any given moment would then be dependent on the specific operating condition experienced by the system at that moment.

METHOD FOR PROGRAMMING DATA TRANSMISSION TO TERMINALS OF A WIRELESS COMMUNICATION SYSTEM VIA A SPACE COMMUNICATION LINE; WIRELESS COMMUNICATION SYSTEM, THE SYSTEM TERMINAL, AND A DEVICE FOR PROGRAMMING DATA TRANSMISSION TO THE SYSTEM TERMINALS (VARIANTS)

Radio communication method and radio communication device

The invention provides a radio communication method and a radio communication device. Conventionally, if the number of transmission antennas is greater than that of reception antennas, different signals simultaneously transmitted from the transmission antennas cannot be separated from one another at the receiving end, resulting in a significant degradation of received-signal quality. A transmitter and a receiver each have a plurality of antennas. The transmitter transmits a pilot signal. The receiver receives the pilot signal, calculates transmission-related information corresponding to the pilot signal, selects, based on this calculated information, a transmission signal to be used by the transmitter, and notifies the transmitter of the selected signal. The transmitter selects, from the informed transmission signal, transmission antennas and uses the selected antennas to transmit information signals, so that a signal separation can be easily performed at the receiving end.

Mixed mode preamble for mimo wireless communications

A preamble of a frame for a multiple input multiple output (MIMO) wireless communication for a first transmit antenna of the MIMO communication includes a legacy preamble portion in accordance with a legacy wireless communication protocol. The preamble of the frame for the MIMO wireless communication for the first transmit antenna also includes a current protocol preamble portion in accordance with a protocol of the MIMO wireless communication. The preamble of a frame for at least a second antenna of the MIMO communication includes a cyclically shifted legacy preamble portion for the frame. The preamble of the frame for the MIMO wireless communication for the second transmit antenna also includes a second current protocol preamble portion in accordance with a protocol of the MIMO wireless communication.

Wireless transmission apparatus and precoding method

A wireless transmission apparatus able to reliably increase outage capacity according to the state of a propagation path. This apparatus is a wireless transmission apparatus ( 100 ) which transmits a plurality of streams to a wireless reception apparatus; wherein a time/space allocation determining unit ( 107 ) determines the spatial multiplex stream number based on the desired multipath number and the number of reception antenna ports of the wireless reception apparatus, said desired multipath number being calculated based on the detected multipath number, the number of reception antenna ports, and the desired error rate for the plurality of streams; a stream dividing unit ( 109 ) divides the transmission data into a plurality of streams of that spatial multiplex stream number; a transmission weight calculation unit ( 108 ) calculates a transmission weight based on the desired multipath number, spatial multiplex stream number, and a channel estimation value; and a time precoding unit ( 1103 ) and a spatial precoding unit ( 111 ) use the transmission weight to precode the plurality of streams.

Method and apparatus for transmitting reference signal in multi-antenna system

A method for transmitting a reference signal in a multi-antenna system is provided. The method includes: selecting at least one orthogonal frequency division multiplexing (OFDM) symbol in a subframe containing a plurality of OFDM symbols; allocating a channel quality indication reference signal (CQI RS) capable of measuring a channel state for each of a plurality of antennas to the selected at least one OFDM symbol; and transmitting the CQI RS, wherein the CQI RS is allocated to an OFDM symbol which does not overlap with an OFDM symbol to which a common reference signal to be transmitted to all user equipments in a cell or a dedicated reference signal to be transmitted to a specific user equipment in the cell is allocated.

Communication device and communication method, computer program, and communication system

Suitable beam pattern control is performed while performing access control based on physical carrier sense. A communication device transmits frames having a long preamble under a state where signals will not reach unless a beam pattern is formed, thereby enabling access control based on physical carrier sense, and under a state where signals will sufficiently reach without a beam pattern being formed transmits frames having a shorter preamble, thereby suppressing transmission overhead. Also, a beam pattern and preamble type are decided based on transmission/reception history of access control following CSMA/CA procedures.

Method and apparatus for reporting channel state information of multi-channel in wireless local area network system

A method for reporting channel state information (CSI), performed by a beamformee, in a wireless local area network system using multi-channels is provided. The method includes receiving, from a beamformer, an NDP announcement (NDPA) frame announcing that a null data packet (NDP) frame follows the NDPA frame, receiving the NDP frame from the beamformer, estimating a channel from a training symbol of the NDP frame and transmitting to the beamformer a CSI report frame containing a result obtained by estimating the channel, wherein the channel is a multi-channel acquired by aggregating first and second channels which are non-contiguous to each other, and wherein the CSI report frame includes an average signal to noise ratio (SNR) for each space-time stream of the first channel and a steering matrix for each subcarrier of the first channel and an average SNR for each space-time stream of the second channel and a steering matrix for each subcarrier of the second channel.

Link layer multicasting systems and methods

Beamforming systems and methods are disclosed. In accordance with one method, indications of channel matrices for a plurality of receivers are obtained. Further, a beamformer matrix is formulated as a linear combination of columns of hermitians of the channel matrices. In addition, coefficients of the hermitians in the linear combination are determined to compute the beamformer matrix such that a lowest reception rate among reception rates of each of the receivers is maximized. Data signals are transmitted to the receivers by applying the computed beamformer matrix to data symbols to maximize the lowest reception rate.

Polarization Re-alignment for Mobile Satellite Terminals

A system for allowing ground terminals, specifically mobile ground terminals, to dynamically and electronically realign signal polarizations to match that of incoming and outgoing signal polarizations from designated space assets, specifically communications from satellites, comprising an adaptive re-orientation technique based on a cost minimization function, and a means of direct calculations of weighting components based on the knowledge of the orientation and bearing of both the satellites and the ground terminals. The embodiment will allow a mobile ground terminal to electronically realign itself to the signals of a satellite, without the need for mechanical processes to physically re-orient the antenna array.

Ack/nack transmission for multi-carrier operation

Techniques for acknowledging data transmissions in a multi-carrier wireless communication network are disclosed. In some aspects, a user equipment (UE) receives a data transmission on at least one component carrier (CC) in a plurality of configured CCs. The UE determines acknowledgement/negative acknowledgement (ACK/NACK) information for the data transmission and determines an uplink channel for sending the ACK/NACK information. When the ACK/NACK information is sent on a PUCCH, the UE may perform power control based on which CCs in the plurality of configured CCs data is received. When the ACK/NACK information is sent on a PUSCH, the UE may determine a number of resource elements based on its CC configuration.

Ack/nack transmission for multi-carrier operation with downlink assignment index

Techniques for acknowledging data transmissions in a multi-carrier wireless communication network are disclosed. In one aspect, a UE determines a number of acknowledgement/negative acknowledgement (ACK/NACK) bits for a data transmission on one more component carriers (CCs) based on information obtained from a grant. The grant may be a downlink grant or an uplink grant, and the information obtained may include a number of CCs scheduled for data transmission and/or identifiers of the scheduled CCs. The UE may determine the number of ACK/NACK bits for acknowledging the data transmission based on the number of scheduled CCs and the identifier of each scheduled CC.

Signaling method and apparatus to enable multiple antenna communications in wireless systems

A method ( 200 ) for signaling a transmission mode in a wireless communication networks comprises selecting a signature sequence corresponding to the transmission mode of a transmitting device (S 210 ); forming, for each antenna in the transmitting device, a synchronization field based on the selected signature sequence, wherein the synchronization field is included in a preamble (S 220 ); and transmitting, from each antenna in the transmitting device, the data frame that comprises the preamble.

Precoding with reduced feedback for coordinated multipoint transmission on the downlink

Techniques for reducing the number of bits needed to specify the best precoding vector for each mobile station in a wireless communication network that employs multi-point transmission are disclosed. An exemplary method begins with the estimation of path loss between a mobile station and each of a plurality of geographically separated transmitter sites, each transmitter site having at least one transmitter antenna. Based on the estimated path losses, one of a plurality of pre-determined subsets (codebooks) of a pre-determined set of antenna precoding vectors is selected. A group index identifying the selected subset is then transmitted to the mobile station. Subsequently, a vector index is received from the mobile station, the vector index corresponding to a precoding vector in the selected subset, and data is transmitted to the mobile station, using the precoding vector applied to the transmitter antennas at the plurality of transmitter sites.

method of pre-equalizing a data signal by time reversal in fdd

Pre-equalizing a data signal transmitted in frequency division duplex by an originating entity having a set of originating antennas to a destination entity having a set of destination antennas, including: transmitting a first pilot by a destination antenna; the originating entity estimating a first impulse response of a first channel; an iterative step including an originating antenna transmitting a second pilot modulated by the first impulse response; the destination entity estimating and time reversing a combined impulse response of the first and second channels; the destination antenna transmitting a third pilot modulated by the time-reversed response; estimating a composite response of the channels; re-iterating the iterative step for some originating antennas; and re-iterating the steps of transmitting a first pilot, estimating the first response, and the iterative step for some destination antennas; and determining pre-equalization coefficients for the data signal from a combination of a set of composite impulse responses.

Orthogonal Resource Selection Transmit Diversity

Methods are disclosed for transmitting a plurality of information bits using resource selection on multiple antennas. In one or more embodiments, the methods include: selecting a first and a second orthogonal resource from an allocation of more than two orthogonal resources according to the state of the plurality of information bits; transmitting a first symbol in a first symbol instant on a first antenna using the first orthogonal resource; and transmitting a second symbol in the first symbol instant on a second antenna using the second orthogonal resource. In some embodiments, the first and second orthogonal resources are different and the first symbol is either a reference symbol or a modulation symbol.

Channel state information transmission method appraratus and system

A precoding method, a precoding apparatus, a Frequency Domain Equalization (FDE) method, and an FDE apparatus are provided in the embodiments of the present invention. The precoding method includes: performing offset modulation for a transmitting signal vector; calculating a precoding matrix according to the offset-modulated transmitting signal vector and a receiver decision signal vector, where the precoding matrix is used for performing precoding for the transmitting signal vector; and performing precoding for the transmitting signal vector according to the precoding matrix. Linear precoding is performed by using the offset-modulated signal on the transmitter, and therefore, the interference caused by multiple antennas and multipath propagation is reduced, the system BER is reduced, and the complexity of implementation is low.

Methods and systems for enabling feedback in wireless communication networks

Aspects of the present invention provide additional MAC functionality to support the PHY features of a wireless communication system framework. The additional MAC functionality aids in enabling feedback from wireless terminals to base stations. In some aspects of the invention the feedback is provided on an allocated feedback channel. In other aspects of the invention the feedback is provided by MAC protocol data units (PDU) in a header, mini-header, or subheader. The feedback may be transmitted from the wireless terminal to the base station autonomously by the wireless terminal or in response to an indication from the base station that feedback is requested. Aspects of the invention also provide for allocating feedback resources to form a dedicated feedback channel. One or more of these enhancements is included in a given implementation. Base stations and wireless terminals are also described upon which methods described herein can be implemented.

Mobile station apparatus and communication method

Provided is a base station capable of suppressing increase of overhead of allocation result report in frequency scheduling in multi-carrier communication and obtaining a sufficient frequency diversity effect. In the base station, encoding units ( 101 - 1 to 101 - n ) encode data (# 1 to #n) to mobile stations (# 1 to #n), modulation units ( 102 - 1 to 102 - n )modulate the encoded data so as to generate a data symbol, a scheduler ( 103 ) performs frequency scheduling according to a CQI from each mobile station so as to uniformly allocate data to the respective mobile stations for a part of RB extracted from a plurality of RB, and an SCCH generation unit ( 105 ) generates control information (SCCH information) to report the allocation result in the scheduler ( 103 ) to the respective mobile stations.

Method and system for providing beamforming feedback in wireless communication systems

Techniques to support beamforming for stations in a wireless network are described. A station may support beamforming with implicit or explicit feedback by having capabilities to transmit and receive sounding frames, responding to training request by sending a sounding frame, and responding to request for explicit feedback. In one explicit beamforming embodiment, the station may send a first frame with an explicit feedback request and may also send a Null Data Packet (NDP) having at least one training field but no data field. The station may receive a second frame with explicit feedback, which may be derived based on the NDP. The station may derive steering information based on explicit feedback and may then send a steered frame with beamforming based on the steering information. Other aspects, embodiments, and features are also claimed and described.

Radio transmission control method, radio receiver apparatus, and radio transmitter apparatus

Conventionally, if the number of transmission antennas is greater than that of reception antennas, different signals simultaneously transmitted from the transmission antennas cannot be separated from one another at the receiving end, resulting in a significant degradation of received-signal quality. A transmitter and a receiver each have a plurality of antennas. The transmitter transmits a pilot signal. The receiver receives the pilot signal, calculates transmission-related information corresponding to the pilot signal, selects, based on this calculated information, a transmission signal to be used by the transmitter, and notifies the transmitter of the selected signal. The transmitter selects, from the informed transmission signal, transmission antennas and uses the selected antennas to transmit information signals, so that a signal separation can be easily performed at the receiving end.

Method and apparatus for antenna diversity in multi-input multi-output communication systems

Transmission schemes that can flexibly achieve the desired spatial multiplexing order, spatial diversity order, and channel estimation overhead order are described. For data transmission, the assigned subcarriers and spatial multiplexing order (M) for a receiver are determined, where M≧1. For each assigned subcarrier, M virtual antennas are selected from among V virtual antennas formed with V columns of an orthonormal matrix, where V≧M. V may be selected to achieve the desired spatial diversity order and channel estimation overhead order. Output symbols are mapped to the M virtual antennas selected for each assigned subcarrier by applying the orthonormal matrix. Pilot symbols are also mapped to the V virtual antennas. The mapped symbols are provided for transmission from T transmit antennas, where T≧V. Transmission symbols are generated for the mapped symbols, e.g., based on OFDM or SC-FDMA. Different cyclic delays may be applied for the T transmit antennas to improve diversity.

Method of generating adaptive codebook and multiple input multiple output communication system using the adaptive codebook

Provided is a method of generating an adaptive codebook and a multiple input multiple output (MIMO) communication system using the adaptive codebook. A transmitter and a receiver may generate, from a base codebook based on a matrix associated with statistics of a channel matrix, the adaptive codebook maintaining a unitary characteristic. The transmitter may perform scheduling, transmit filter design, and precoding using adaptive codebook based feedback information.

Signaling to protect advanced receiver performance in wireless local area networks (lans)

Certain aspects of the present disclosure relate to techniques that may be used to help control aspects of beamforming by a beamformee. According to certain aspects, a beamformee may be able to signal, to a beamformer, a maximum number of transmit spatial streams to use for single-user beamformed transmissions.

Radio communication apparatus and radio communication method

A radio communication device capable of lightening the influence of a frequency selective fading in the wide-band transmission of a single carrier thereby to prevent deterioration of error rate characteristics. In this device, an FFT unit subjects a modulated signal inputted from a modulation unit to a Fourier transformation. A pilot insertion unit inserts a pilot symbol into a plurality of individual frequency components of the modulated signal. Weight multiplication units multiply the individual frequency components and the pilot symbols inserted into the individual frequency components, by weight coefficients set at a weight coefficient setting unit. IFFT units subject the frequency components to an inverse Fourier transformation, thereby to convert the frequency components into time domains.

Apparatus for interference cancelling in wireless communication system and method using the same

An interference cancellation method include detecting macro terminals which experience interference between a first signal output from a macro base-station and a second signal delivered from a femto terminal that is greater than a reference value; determining the number of channels of the femto base-station by subtracting the number of the detected macro terminals from the number of antennas of the femto base-station; generating a transmission beamforming weight vector using channel information of a signal interfered by the first signal and the second signal and channel information of the first signal; and providing a service, using the transmission beamforming weight vector, to as many femto terminals as the number obtained by subtracting the number of the detected macro terminals, which experience the interference greater than the reference value, from the number of the antennas of the femto base-station.

Mu-mimo access point and user station including methods for multi-user group management

Embodiments of a MU-MIMO access point, user station and method for multi-user group management are generally described herein. In some embodiments, a MU-MIMO access point may assign a MU group identifier (GID) and a group member index (GMI) to each of a plurality of associated user stations. The MU-MIMO access point may transmit a MU-MIMO transmission that includes a plurality of spatial streams. The MU-MIMO transmission may be destined for the user stations of a single MU group indicated by a GID that is included within the MU-MIMO transmission. A subset of the spatial streams may be intended for each user station of the indicated MU group that is identified by the GID transmitted within the MU-MIMO transmission. A user station may use its assigned GMI along with an N sts field in the MU-MIMO transmission to determine which of the spatial streams to demodulate.

Antenna array for supporting multiple beam architectures

The present invention relates to an antenna array for supporting multiple beam architectures. For example, a transceiver may include an antenna array. The antenna array includes a plurality of antenna elements, where the plurality of antenna elements is configured to support at least two beam architectures in a cell site. Each beam architecture is associated with a different configuration of sectors and beamforming signals. According to one embodiment, each beam architecture is associated with a different wireless standard. According to another embodiment, each beam architecture is associated with a different carrier within one wireless standard. The antenna elements may be arranged as a circular array.

Communication method, and transmitting apparatus and receiving apparatus using that communication method

A transmission apparatus includes a plurality of antennas and a frame configurator that selects, in a first unit time either a first transmitting method which transmits a modulated signal from at least one of the plurality of antennas, or a second transmitting method which transmits a plurality of modulated signals from the plurality of antennas, for a first carrier group arranged for a first terminal and either the first transmitting method or the second transmitting method for a second carrier group arranged for a second terminal. The frame configurator selects, in a second unit time either the first transmitting method or the second transmitting method for the first carrier group arranged for a third terminal and either the first transmitting method or the second transmitting method for the second carrier group arranged for a fourth terminal, wherein each of carrier groups includes one or more sub-carriers.

System and Method for Transparent Coordinated Beam-Forming

A method for reducing interference at a first user equipment (UE) includes receiving, by a second communications controller, a request to reduce interference at the first UE, the first UE being served by a first communications controller. The method also includes determining, by the second communications controller, a beam adjustment in accordance with uplink transmission measurements of the first UE and a second UE, the beam adjustment to aim a transmission to the second UE away from the second UE and towards an angle orthogonal to a first direction of the first UE relative to the second communications controller, the second UE being served by the second communications controller. The method further includes pre-adjusting, by the second communications controller, the transmission with the beam adjustment, and transmitting, by the second communications controller, the pre-adjusted transmission to the second UE.

Receive only smart ground-terminal antenna for geostationary satellites in slightly inclined orbits

A receive only smart antenna with a command pointing option for communicating with geostationary satellites that autonomously detects the directions from which desired signal are received, and steer the multiple beams accordingly. An array feed is used to illuminate a parabolic reflector. Each feed element of the receive only smart antenna is associated with a unique beam pointing direction. As a receiver is switched to different feed elements, the far-field beam is scanned, making it possible to track a geostationary satellite in a slightly inclined orbit. This eliminates the need for mechanical tracking and maintains high antenna gain in the direction of the geostationary satellite. The receive only smart antenna also features capabilities to form multiple simultaneous beams supporting operations of multiple geo-satellites in closely spaced slightly inclined orbits. The designs can support orthogonal beams for enhanced bandwidth capacity via multiple beams with excellent spatial isolation.

Method for transmitting channel quality information, and apparatus for same

The present invention relates to a wireless communication system. In particular, the present invention relates to a method and apparatus for transmitting channel quality information using a terminal, wherein the method comprises the steps of: receiving CoMP configuration information from a serving transmission point; receiving a downlink signal from a plurality of transmission points; and transmitting channel quality information on one or more downlink sub-bands for each transmission point to the serving transmission point, wherein the plurality of transmission points select the same one or more downlink sub-bands in consideration of the CoMP configuration information.

Method of transmission from multiple transmit chains based on a cost function for electromagnetic radiation

Embodiments of methods and apparatuses for transmission using a plurality of transmit chains based on a cost function for electromagnetic radiation are disclosed. One method is utilizing a plurality of chains, adjusting at least one of a phase or an amplitude of at least one of the transmit chains based on a cost function, wherein the cost function comprises a criterion for quality of reception at an intended receiver and a threshold for electromagnetic radiation.

Out-of-band emission cancellation

A transmission signal pre-processing method and apparatus for out-of-band emission cancellation are disclosed. For each of N subchannels in a band weighting each of N subchannel symbols by a calculated value in the range from 0 to 1 is performed. Precoding said N weighted symbols, organised as an N×1 matrix, by multiplication by a unitary matrix is then performed.

Fixed multiple access wireless communication

Disclosed is a user terminal for wireless communication with a remote access point, the user terminal comprising: a mapping module adapted to map one or more input data bits to an uplink symbol; a delay module adapted to apply a delay to the uplink symbol; a transmit module adapted to modulate the delayed symbol into a frequency channel; and a directional antenna oriented along a dominant path to the access point, the antenna being adapted to transmit the modulated symbol to the access point, wherein the delay is chosen such that the transmitted symbol arrives at the access point simultaneously with a further symbol modulated into the frequency channel and transmitted by a further user terminal.

Method and device for feeding back spatial channel state

A method for feeding back spatial channel state and a device for feeding back spatial channel state are disclosed by the invention. The method for feeding back spatial channel state according to an embodiment of the present invention includes: determining the probability of being scheduled of the spatial channel; determining feedback information based on the probability of being scheduled of the spatial channel; and transmitting the determined feedback information; wherein more feedback information is used for the spatial channel having high probability of being scheduled than that of the spatial channel with low probability of being scheduled.

Multiple input multiple output and beam-forming data transmission method and device

The present invention provides a method and system for transmitting Multiple Input Multiple Output (MIMO) beam forming data. The method comprises: performing MIMO coding on data streams to obtain the coded data streams; obtaining weight values W=(W i,j ) Tx×S for beam forming of an antenna array of Tx×S of a transmitting end based on channel information from the antenna array of the transmitting end to antennas of a receiving end, where Tx is the number of transmitting antennas of the transmitting end, S is the number of the MIMO-coded data streams, and S≦Tx; and weighting the coded data streams with the weight values W=(W i,j ) Tx×S for beam forming, and transmitting the weighted data streams by corresponding antennas, where the data transmitted by antenna i is superposed data Σ j=1 S W i,j x j , i=1, . . . , Tx, j=1, . . . , S, and x j is j th coded data stream.

Cognitive radio base station and communication method thereof in multi-user multiple-input multiple output cognitive radio network system

A communication method for a cognitive radio (CR) base station in a multi-user multiple-input multiple-output (MIMO) CR communication system including the CR base station and CR terminals, may include calculating, from an interference channel, an orthogonal projection matrix to be used for removing interference on a primary user through use of a zero forcing (ZF) processing scheme, and obtaining a beamforming weight vector for each of the CR terminals, through use of the orthogonal projection matrix.

Phased-array antenna and phase control method therefor

The precision of phase correction is improved. Provided are a detection unit ( 40 ) that detects a phase of arrival of a pilot signal at each of antenna panel on the basis of the pilot signal and a reference signal commonly transmitted to each antenna panel; a position specifying unit ( 51 ) that specifies a position of each of the antenna panels relative to a reference panel defined as an antenna panel for reference among the plurality of the antenna panels, on the basis of the phase of arrival and an angle of arrival formed between the direction of arrival of the pilot signal and the antenna panel; and a phase-shift setting unit ( 52 ) that sets respective phase shifts for the signals radiated from individual antenna elements on the basis of information about the positions of the antenna panels specified by the position specifying unit ( 51 ).

Radio base station apparatus, mobile terminal apparatus and radio communication method

The present invention provides a radio base station apparatus, a radio terminal apparatus and a radio communication method that can realize highly efficient fallback mode when transmission diversity is adopted in fallback mode in an LTE-A system. With the radio communication method of the present invention, a radio base station apparatus, in fall back mode, performs scheduling for fallback mode, which takes into account the reference signal structures in fallback mode, and transmits a transmission signal after the scheduling by open loop control transmission diversity, and a mobile terminal apparatus receives a downlink signal including mode information, and, in fallback mode, performs channel estimation for fallback mode based on the mode information, and demodulates the downlink signal using the acquired channel estimation value.

Communication control method, communication system, and management server

Provided is a communication control method including: determining whether or not reception quality of a second reception device satisfies a predetermined reference in a communication system including a first transmission device, a first reception device, a second transmission device secondarily using a frequency having been assigned to the first transmission device, and the second reception device; and, when it is determined that the reception quality of the second reception device does not satisfy the predetermined reference, additionally performing reception beam steering by the first reception device, beam steering by the first transmission device, reception beam steering by the second reception device, or transmission beam steering by the second transmission device in a predetermined order.

Control Channels in Multicarrier OFDM Transmission

A base station transmits control information on a subframe of a first carrier starting from the first OFDM symbol of the subframe. The control information provides transmission format and scheduling information for data packets transmitted on a first data channel of the first carrier. The base station transmits a control message on the first data channel to a wireless device. The control message configures radio resources of a second data channel to start from the first OFDM symbol of subframes of a second carrier. The base station transmits data packets on the second data channel.

Method and System of Beamforming a Broadband Signal Through a Multiport Network

Aspects of a method and system for beamforming a broadband signal through a multipart network are provided. In this regard, a plurality of signals received via a plurality of antennas may be detected and a plurality of transmit signals may be generated, wherein a phase of at least one of the plurality of transmit signals is responsive to at least one of the detected phases of the received signals. Each of the generated plurality of transmit signals may be separately amplified to generate a plurality of amplified signals. A plurality of the amplified signals may be input to a plurality of first ports is of a multi-port network, wherein at least one second port of the multi-port network may be responsive to signals input to at least two of the plurality of first ports.

Closed-loop efficiency modulation for use in network powered applications

Methods for reducing power dissipation from an input power source in a telecommunications system are disclosed. In one embodiment the method includes: utilizing a first I2C device to monitor an input voltage and input current to a remote unit; providing the input voltage and input current to a main microprocessor for calculating an input power; utilizing a second I2C device to monitor an output voltage and output current from the remote unit; providing the output voltage and output current to the main microprocessor for calculating an output power; calculating a power efficiency of the remote unit at the main microprocessor based on the input power and the output power; utilizing a third I2C device to provide the power efficiency of the remote unit to a digital power manager; and utilizing the digital power manager to control the DA trim output to a DC/DC converter.

Method for single stream beamforming with mixed power constraints

System and method for calculating a transmitter beamforming vector related to a channel vector h under per-antenna power constraints combined with total power constraint, under per-antenna power constraints combined with overall line of site (LOS) effective isotropic radiated power (EIRP) and under all three constraints. Calculating a transmitter beamforming vector may be done in the transmitter, in the receiver and feedback to the transmitter or in both. The method may be adapted to perform with a multi-antenna receiver and with multi-carrier systems.

Method and apparatus for downlink multiuser mimo transmission in a wireless network

A base station transmits to a number of relay stations in a wireless network using a beamforming matrix. The beamforming matrix is generated by first obtaining a column vector from a beamforming matrix associated with each of the relay stations. An intermediate matrix is then generated using these column vectors. A zero-forcing procedure is then utilized to process the intermediate network to generate the final beamforming matrix.

Multiple antenna transmission with per-antenna power constraints

A method, apparatus, and system to transmit signals using multiple antennas with per-antenna power constraints. The method includes initializing a precoding algorithm to a complex matrix. The precoding algorithm is for precoding signals transmitted by a plurality of antennas. The method includes iteratively processing the precoding algorithm on a per-antenna basis by, at each iteration, sequentially updating a precoder for each of the plurality of antennas. The method includes, after each iteration, determining whether the precoding algorithm has converged based on a change in a rate of mutual information across iterations. Additionally, the method includes, in response to determining that the precoding algorithm has converged, transmitting the signals using the precoding algorithm.

Backhaul enhancements for cooperative multi-point (comp) operations

Certain aspects of the present disclosure relate to techniques for backhaul enhancements for cooperative multi-point (CoMP) operations. An aggressor node may take pre-scheduling decisions in advance of beamformed data transmissions based on the pre-scheduling decisions. The aggressor node may communicate the pre-scheduling decisions to one or more victim nodes, for example, via a backhaul link between the aggressor node and the one or more victim nodes. A victim node may take scheduling decisions based at least on the pre-scheduling decisions of the aggressor node to coordinate beamformed transmissions from the victim node with the beamformed transmissions from the aggressor node.

Integrity and Quality Monitoring and Signaling for Sounding and Reduced Feedback

A method of sounding and feedback with channel quality information and reduced overhead is provided. A receiving station receives a sounding signal transmitted from an access point over multiple sub-channels of a wide channel in a wireless network. The receiving station detects channel quality based on the received sounding signal for each sub-channel. The receiving station then performs channel estimation based on the received sounding signal and thereby determining feedback information. Finally, the receiving station transmits a feedback message to the access point, the feedback message contains NULL feedback information, reduced feedback information, or channel integrity/quality indicators based on the channel quality information for each sub-channel. Based on the feedback message, the access point may repeat the sounding process, narrow the transmission bandwidth, or select only stations who have indicated uncorrupted channel sounding for MU-MMO transmission.

METHOD AND APPARATUS FOR TRANSCEIVING SIGNALS IN A DISTRIBUTED ANTENNA SYSTEM

The present invention relates to a terminal which receives signals from a base station, and to a method in which the terminal receives signals from the base station in a distributed antenna system (DAS). The terminal receives, from the base station having a plurality of antennas, control information on one or more active transmission antennas allocated to the terminal, from among the plurality of antennas, and receives signals from the base station via said one or more active transmission antennas. 1. A method of receiving a signal , which is received from a base station by a user equipment in a distributed antenna system (DAS) , the method comprising the steps of:1) receiving control information on at least one effective transmitting antenna allocated to the user equipment among a plurality of antennas from the base station including the plurality of antennas; and2) receiving the signal via the at least one effective transmitting antenna from the base station.2. The method of claim 1 , wherein the control information comprises at least one selected from the group consisting of information on the number of the at least one effective transmitting antenna claim 1 , index information of the at least one effective transmitting antenna and received signal strength information for each of the plurality of antennas.3. The method of claim 2 , further comprising the step of mapping at least one PAI to logical antenna indexes (LAI) according to a predetermined mapping rule.4. The method of claim 3 , wherein the predetermined mapping rule configures the LAI with an index of the effective transmitting antenna in performance order according to a power gain for each effective transmitting antenna.5. The method of claim 1 , wherein the control information comprises at least one selected from the group consisting of information on one or more pilot pattern indexes (PPI) supportive of the user equipment and information on PPI having an interference influence on the user equipment.6. ...

Techniques for dynamic resource allocation

Techniques are disclosed that dynamically allocate communications resources in a wireless communications network, such as a wireless personal area network (WPAN). For instance, a wireless communications device may obtain a resource allocation. This resource allocation includes a time slot (e.g., a TDMA time slot) within a wireless communications medium. The device determines a first portion of the time slot in which it intends to transmit data. Also, the wireless communications device relinquishes a second portion of the time slot that occurs after the first portion of the time slot. Based on this relinquishment, a central controller device may reallocate the second portion of the time slot.

Node in a Communication System with Switchable Antenna Functions

The present invention relates to a node ( 1 ) in a wireless communication system, the node ( 1 ) comprising at least a first and second antenna function ( 2, 3 ), and a first and second radio chain ( 4, 5 ). At least at the start of a first mode of operation, each antenna function ( 2, 3 ) is connected to a corresponding radio chain ( 4, 5 ). The node further comprises a switching network ( 6 ) and a beamforming network ( 7 ), which switching network ( 6 ), at least at the start of a second mode of operation, is arranged to disconnect at least one antenna function ( 2 ) from its corresponding radio chain ( 4 ) and connect it to another of the radio chains ( 5 ) via at least a part of the beamforming network ( 7 ), such that at least two antenna functions ( 2, 3 ) are connected to the same radio chain ( 5 ). The node ( 1 ) is arranged to perform beamforming for said at least two antenna functions ( 2, 3 ) by means of said beamforming network ( 7 ), the switching network ( 6 ) being arranged to switch between the first mode and the second mode.

Wireless communication device, wireless communication system, wireless communication method, and program

There is provided a wireless communication device including a communication unit that transmits a reference signal, a first multiplication unit that performs multiplication of first transmission weight that is determined based on reception of the reference signal by a communication partner, and a second multiplication unit that performs multiplication of second transmission weight that is determined based on reception of the reference signal by the communication partner. The communication unit transmits a reference signal with weight that is obtained by multiplying the reference signal by the first transmission weight after determination of the first transmission weight.

Systems and Methods for Signal Frequency Division in Wireless Communication Systems

An exemplary system comprises at least one antenna, first and second signal paths, and an N-plexer. The antenna may be configured to receive first and second diversity receive signals. The antenna is further configured to transmit first and second diversity transmit signals. The first signal path may have a frequency converter configured to downconvert the first diversity receive signal to an intermediate frequency and to upconvert the first diversity transmit signal to a radio frequency. The second signal path may have a frequency converter configured to downconvert the second diversity receive signal to an intermediate frequency and to upconvert the second diversity transmit signal to the radio frequency. The N-plexer may be configured to provide the first and second diversity receive signals to a cable and to provide from the cable the first and second diversity transmit signals to the first signal path and the second signal path, respectively.

Beamforming using base and differential codebooks

Embodiments of methods and apparatus for determining and/or quantizing a beamforming matrix are disclosed. In some embodiments, the determining and/or quantizing of the beamforming matrix may include the use of a base codebook and a differential codebook. Additional variants and embodiments are also disclosed.

Apparatus and method for providing multi-antenna scheme in wireless communication system

Provided are an apparatus and method for providing a multi-antenna scheme in a wireless communication system by using a plurality of terminals. In a downlink receiving scheme at a mobile terminal, a terminal group is established comprising the mobile terminal and at least one adjacent terminal The mobile terminal receives a first signal from a base station, and at least one second signal through a short-range communication network from the at least one adjacent terminal The at least one second signal is representative of the first signal transmitted from the base station as received at the at least one adjacent terminal A received signal is detected as an antenna array signal on the basis of the first and at least one second signals. A similar scheme may be used for uplink transmissions, in which a virtual antenna array is established with a terminal group for transmitting uplink.

Devices and Methods Related to Improvements in Coordinated Multipoint Transmission Arrangements

For coordinated multipoint transmission arrangements there is provided a device, including a controller module, configured to control a plurality of transmission points, each constituted by a set of at least one transmit antenna, to transmit data to another device in a coordinated transmission from at least a subset of the plurality of transmission points, wherein each subset with resources allocated thereto defines a respective coordinated transmission scheme, wherein the controller module is configured to transmit information on resources pertaining to multiple coordinated transmission schemes, and send at least one biasing parameter associated to at least one of the transmission schemes, to be applied for biasing a channel quality parameter. Another device includes a controller module, configured to report feedback responsive to such coordinated transmission, and the controller module is, among others, configured to apply the at least one biasing parameter to derived channel quality parameters.

Wireless communication system, radio base station apparatus and radio terminal apparatus

A wireless communication system comprises radio base station apparatuses each of which transmits an estimation pilot in advance for estimating the quality of a downlink communication after a spatial signal processing performed after a time unified among the radio base station apparatuses; and radio terminal apparatuses each of which receives the estimation pilot to determine the quality of the downlink communication, thereby reporting the determined downlink communication quality to the radio base station apparatus via an uplink channel. The estimation pilot is transmitted at the same time and frequency established among the radio base station apparatuses by use of the same directivity beam as used for transmitting the data after the unified time.

Communication device and method for generating beamforming link

A communication device which generates a beamforming link between the communication device and an external device is provided. The communication device includes: a beamforming link generating unit which generates a first beamforming link between a first antenna of a plurality of antennas of the communication device and the external device, and which generates a second beamforming link between a second antenna of the plurality of antennas of the communication device and the external device; and a transmission unit which transmits data to the external device via each of the first beamforming link and the second beamforming link.

Transmission method, transmitter, and receiver for multi antenna wireless communication system

A transmitter includes first generator to generate pilot source signal by modulating pilot sequence, second generator to generate data source signal with time length longer than that of pilot source signal by modulating data sequence, first cyclic shifter to perform cyclic shift of first shift amount to pilot source signal to generate first pilot signal, second cyclic shifter to performs cyclic shift of second shift amount to data source signal to generate first data signal, third cyclic shifter to perform cyclic shift of third shift amount to pilot source signal to generate second pilot signal, fourth cyclic shifter to perform cyclic shift of fourth shift amount to data source signal to generate second data signal, first transmit antenna to transmit first pilot signal and first data signal, and second transmit antenna to transmit second pilot signal and second data signal.

Transmission Of Precoding Codebook Over An Air Interface

Embodiments of the present invention include a system for transmitting a precoding codebook over an air interface. The system includes a first station configured to signal a set of indicators via at least one antenna to a second station from which the precoding codebook is derived at the second station based on the signaled set of indicators. The set of indicators includes less information than the precoding codebook. 1. A system for transmitting a precoding codebook over an air interface , the system comprising:a first station configured to signal a set of indicators via a plurality of antennas to a second station from which the precoding codebook is derived at the second station based on the signaled set of indicators, the set of indicators including less information than the precoding codebook,wherein the set of indicators includes a sub-set of complex elements of the precoding codebook, wherein the complex elements of the sub-set are dependent upon each other,wherein a first antenna of the plurality of antennas is assigned a first antenna weight and a subsequent antenna is assigned a second weight, the second weight being a function of the first antenna weight and an antenna weight of a preceding antenna.2. The system of claim 1 , wherein the set of indicators includes a first set of codewords such that a second set of codewords can be derived at the second station based on a mirror operation.3. The system of claim 1 , wherein each complex element of the sub-set has a predefined magnitude or phase.4. The system of claim 1 , wherein the set of indicators includes a base phase for one of the plurality of antennas and an offset phase for other antennas of the plurality of antennas.5. The system of claim 1 , wherein the precoding codebook is a hierarchical codebook and the set of indicators includes an indicator indicating a level of a hierarchy and a set of matrices among matrices comprising the indicated level.6. The system of claim 1 , wherein the precoding ...

Method for Communicating with a User Equipment Using Plurality of Transmit Antennas

The invention relates to a method for communicating with a user equipment using a plurality of transmit antennas being capable of generating transmission beams in a communication network. The method includes deciding whether to generate either a first transmission beam using a first beamforming approach or to generate a second transmission beam using a second beamforming approach in dependency on a network condition. Based upon a result of the deciding, the first transmission beam or the second transmission beam is transmitted towards the user equipment.

Device and method for wcdma uplink transmissions

A NodeB for a WCDMA system, arranged to transmit instructions to a UE for the UE's uplink transmissions. The NodeB is arranged to transmit the instructions on a dedicated downlink physical channel which the NodeB is arranged to use for transmissions to a plurality of UEs and which comprises a plurality of radio frames, where each radio frame comprises a number of slots and each slot comprises a number of WCDMA symbols. The instructions to the UE comprise Transmit Power Commands as well as other instructions to the UE for the UE's uplink transmissions. The NodeB is arranged to use a first WCDMA slot format for the TPC commands to the UE and a second WCDMA slot format for the other instructions to the UE.

Transmitter and transmission method

A transmitter includes multiple transmit antennas, a conversion unit configured to generate multiple signal sequences corresponding to a predefined frequency bandwidth from one or more transmission streams associated with any of the transmit antennas, a precoding unit configured to weight the signal sequences with a precoding matrix selected from a codebook including multiple predefined precoding matrices, and a transmitting unit configured to convert an output signal from the precoding unit into a number of signals corresponding to the number of transmit antennas and transmit the converted signals from the transmit antennas. The precoding unit applies distinct precoding matrices to different signal sequences, and an association between the distinct precoding matrices and the different signal sequences is determined through open-loop control being independent of a feedback from a receiver.

Multiple transmit antenna interleaver design

An arrangement of interleavers allocates bits from an input symbol across sub-symbols transmitted via sub-carriers of multiple orthogonal frequency division multiplex (OFDM) carriers. The input bits are allocated in a fashion to provide separation across subcarriers, and rotation of sub-symbols across the OFDM carriers provides additional robustness in the present of signal path impairments.

System and method for channel-adaptive antenna selection

Systems and methods that provide channel-adaptive antenna selection in multi-antenna element communication systems are provided. In one embodiment, a method that selects a subset of receive antennas of a receiver to receive a transmitted RF signal may include, for example, one or more of the following: establishing possible subsets of the receive antennas; determining sets of channel parameter statistics corresponding to the possible subsets of the receive antennas; computing output bit error rates of the receiver, each output bit error rate being computed based on at least one set of channel parameter statistics; selecting a particular possible subset of the receive antennas based upon a criterion predicated on the computed output bit error rates; and connecting one or more RF chains of the receiver to the receive antennas of the selected particular possible subset.

Component carrier uplink maximum transmission power reporting scheme for carrier aggregation

Embodiments of the present disclosure describe method, apparatus, and system configurations for reporting uplink maximum transmission power for each component carrier of a carrier aggregation scheme. A method includes establishing, by a user equipment (UE), a communication link with an enhanced node B (eNB) station of an Internet Protocol (IP) based wireless communication network, and sending, by the UE to the eNB station, a message that includes information for a Power Headroom Report (PHR) and a value that indicates an uplink maximum transmission power P CMAX,c for individual active component carriers of a carrier aggregation scheme. Other embodiments may be described and/or claimed.

Hybrid codebook design for wireless systems

Briefly, in accordance with one or more embodiments, a codebook for wireless transmissions may be generated by dividing a codebook into a fixed set of codewords and an adaptive set of codewords. The adaptive set of codewords may be scaled to cluster together and then rotated to be centered or nearly centered about a target. The adaptive set of codewords may then be merged with the fixed set of codewords to provide a hybrid codebook. A codeword from the hybrid codebook may be selected for precoding a transmission to provide a minimum, or nearly minimum, quantization error.

Method and device for transmitting/receiving channel state information in a wireless communication system

The present invention relates to a wireless communication system, and more particularly, to a method and device for transmitting/receiving channel state information (CSI). A method for a terminal for transmitting CSI according to one embodiment of the present invention includes: a first step of receiving a reference signal for channel measurement from a base station; a second step of generating sub-band (SB) CSI for each of a plurality of SBs using the received reference signal in the terminal and sequentially transmitting the generated SB CSI to a base station; and a third step of sequentially transmitting each SB CSI to a base station according to an order different from that of the sequential transmission.

Contactless connector

A contactless connector includes a transmitter having a first transmit integrated circuit generating a first signal and a second transmit integrated circuit generating a second signal. A first pick-up antenna is adjacent the first transmit integrated circuit and conveys the first signal along a first transmission line to a first propagation antenna. A second pick-up antenna is adjacent the second transmit integrated circuit and conveys the second signal along a second transmission line to a second propagation antenna. The first and second propagation antennas transmit the first and second signals to a propagation path at different and separable polarizations to allow duplex communication with the propagation path.

Wireless communication method, wireless communication system, base station, and mobile station

A method for performing wireless communication includes performing a precoding process beforehand on a plurality of symbols at a base station; performing space block coding on the plurality of symbols at the base station after the precoding process; sending signals from a plurality of antennas of the base station; performing space block decoding on the signals received by a plurality of antennas at a mobile station; performing antenna combination and a deprecoding process on the signals at the mobile station after the signals have undergone the space block decoding; and estimating the plurality of symbols at the mobile station from the signals that have undergone the deprecoding process.

Method for Transmitting a Data Signal in a MIMO System

A method for transmitting a data signal by a transmission unit of a wireless multiple-input/multiple-output (MI MO) communication system. The communication system includes the transmission unit and a reception unit, the transmission unit having a plurality of transmission antennas and the reception unit having a plurality of reception antennas. The method includes performing a first transmission of a data signal, the first transmission including transmitting the data signal by each one of the plurality of transmission antennas, and performing a second transmission of the data signal at a time later than the first transmission, the second transmission including transmitting at least one spectrally modified signal variant of the data signal by at least one antenna of the plurality of transmission antennas.

Protocol for mu mimo operation in a wireless network

Various embodiments of the invention may modify the techniques used in conventional networks, to achieve techniques that are better suited for networks that use highly directional communications. A novel method is described for determining whether a channel in such a network is idle. In addition, various protocols and formats are disclosed that are intended for such a network.

Mobility-Resilient Multi-Antenna Communications

The antenna weight selection solution disclosed herein selects antenna weights for a multiple antenna communication system that transmits uplink or downlink data using multiple radiation patterns based on channel variability metrics determined for two or more sets of candidate antenna weights. In so doing the antenna weight selection solution disclosed herein reduces the channel variability associated with data transmissions, and therefore reduces the amount of feedback and/or the feedback rates required for the multiple antenna communication system.

Spatial Multiplexing in a Cellular Network

The present invention provides methods and apparatus for implementing spatial multiplexing in conjunction with the one or more multiple access protocols during the broadcast of information in a wireless network. A subscriber unit for use in a cellular system is disclosed. The subscriber unit includes: spatially separate receivers, a spatial processor, and a combiner. The spatially separate receivers receive the assigned channel composite signals resulting from the spatially separate transmission of the subscriber downlink datastream(s). The spatial processor is configurable in response to a control signal transmitted by the base station to separate the composite signals into estimated substreams based on information obtained during the transmission of known data patterns from at least one of the base stations. The spatial processor signals the base stations when a change of a spatial transmission configuration is required. The combiner combines the estimated substreams into a corresponding subscriber datastream.

Multiple-Input Multiple-Output System And Method

A multiple-input multiple-output (MIMO) system can transmit on multiple antennas simultaneously and receive on multiple antennas simultaneously. Unfortunately, because a legacy 802.11a/g device is not able to decode multiple data streams, such a legacy device may “stomp” on a MIMO packet by transmitting before the transmission of the MIMO packet is complete. Therefore, MIMO systems and methods are provided herein to allow legacy devices to decode the length of a MIMO packet and to restrain from transmitting during that period. These MIMO systems and methods are optimized for efficient transmission of MIMO packets.

Method and apparatus for tracking uplink beams in beamforming-based wireless communication system

A method and apparatus perform Uplink (UL) beam tracking in a beamforming-based wireless communication system. A Mobile Station (MS) repeatedly transmits code sequences mapped respectively to MS transmit beams through each MS transmit beam as many times as the number of Base Station (BS) receive beams while sweeping the MS transmit beams. The MS receives, from a BS, transmit beam information indicating at least one best transmit beam selected from the MS transmit beams by the BS, and allocation information used to allocate UL resources for UL feedback. The MS transmits best beam information indicating the at least one best transmit beam and a MS identifier to the BS using the UL resources.

Interference mitigation techniques for air to ground systems

A method for air to ground communication interference mitigation within an aircraft equipped with a multi-beam array antenna includes adjusting a modulation symbol interleaving and/or forward error correction of an aircraft receiver interface in response to detected interference from an interferer. The method further includes reducing a data rate of the aircraft receiver interface when the adjusting of the modulation symbol interleaving and/or forward error correction does not mitigate the detected interference. Another method for interference mitigation may include performing antenna beam-steering away from a geographic (GEO) arc during an aircraft turn. This method further includes reducing an aircraft transmitter transmit power when a signal quality of a forward link is within a predetermined range of a signal quality threshold.

Methods and apparatus of enhancing performance in wireless communication systems

Methods and apparatus for supporting and using multiple communications channels corresponding to different transmit technologies and/or access technologies in parallel within a cell of a wireless communications system are described. Mobile nodes support multiple technologies and can switch between the technology being used at a particular point in time, from a first channel corresponding to a first technology to a second channel corresponding to a different technology which provides better transmission characteristics, e.g., a better perceived channel quality. Mobiles maintain at least two sets of channel quality information at any one point in time. Mobiles select the better channel and communicate the channel selection to the base station or communicate channel quality information for multiple channels to the base station and allow the base station to select the channel corresponding to the technology providing the better conditions for the mobile. Different mobiles in the same cell may support different technologies.

Wireless communication device and wireless communication method

A wireless communication device transmits and receives a signal by a wireless communication using a millimeter wave frequency band. The wireless communication device includes an antenna section having directivities in a plurality of different directions, an antenna control section adapted to form a directivity in a prescribed direction among the plurality of directivities of the antenna section, a direction and position estimation section adapted to estimate direction and position information of a wireless communication device to be communicated with, which is a target for the wireless communication, in accordance with a receiving signal received by the antenna section having the directivity formed, and a display section adapted to display the estimated direction and position information of the wireless communication device to be communicated with.

Centralized control of intra-cell device-to-device communication

An apparatus and method to centrally establish and control intra-cell device-to-device connections on licensed bands of a wireless communications network are disclosed herein. An eNodeB receives a request from a first device to communicate with a second device or a request from the first device for content or service. The eNodeB schedules a device discovery between the first device and at least a candidate device. The eNodeB determines establishing the device-to-device connection between the first device and the candidate device based on a discovery report generated by one of the first or candidate device. The discovery report comprises information about signal quality of transmission from the other one of the first or candidate device that is received by the one of the first or candidate device during the scheduled device discovery.

Spatio-Temporal Processing for Communication

A space-time signal processing system with advantageously reduced complexity. The system may take advantage of multiple transmitter antenna elements and/or multiple receiver antenna elements, or multiple polarizations of a single transmitter antenna element and/or single receiver antenna element. The system is not restricted to wireless contexts and may exploit any channel having multiple inputs or multiple outputs and certain other characteristics. Multi-path effects in a transmission medium cause a multiplicative increase in capacity. 1. An apparatus comprising:a baseband signal processor configured with a plurality of signal processing function modules comprising a plurality of transmit signal processors each of which being configured to assign elements of a symbol vector to a corresponding one of a plurality of antennas; anda transmit spatial processor that is configured to apply weights to outputs of the plurality of transmit signal processors so as to weight the elements of a symbol vector at each of a plurality of frequency bins to produce a plurality of weighted symbols, and to convert the plurality of weighted symbols to the time-domain using an inverse Fourier Transform procedure to produce a plurality of time-domain sequences.2. The apparatus of claim 1 , and further comprising a plurality of converters configured to convert the plurality of time-domain sequences to analog signals for modulation and transmission via the plurality of antennas.3. The apparatus of claim 2 , and further comprising a plurality of modulation and radio frequency (RF) modules claim 2 , each associated with a corresponding antenna claim 2 , configured to upconvert a corresponding analog signal to a carrier frequency for transmission via a corresponding antenna.4. The apparatus of claim 1 , further comprising a symbol encoder configured to encode a bit sequence into a sequence of multidimensional symbol vectors in the frequency domain representing data to be transmitted.5. The ...

Methods and apparatus for multi-dimensional data permutation in wireless networks

Methods and apparatus that seek to increase the diversity seen in wireless communication systems by intelligently implementing a joint multi-dimensional permutation approach. In an exemplary embodiment, this is accomplished by combining the permutation of various transmitter antennas, various data streams (for example, in a MIMO configuration) and various constellation-bit mappings into a coherent multi-dimensional permutation scheme. Subsequent retransmissions in combination with an initial transmission are utilized to obtain substantial signal flattening at a receiver which increases the likelihood that retransmissions that follow detected errors will successfully convey the transmitted data to the receiver. Both open and closed-loop approaches are contemplated which take advantage of the multi-dimensional permutation schemes. In addition, embodiments utilized in the context of retransmission mechanisms such as HARQ are also contemplated.

Information processing apparatus and information processing method, and non-transitory computer readable medium storing information processing program

Transmission channel estimation is performed for NT×NR reception signals and estimated transmission channel values are thereby output. The estimated transmission channel values are divided into N groups of NT×M estimated transmission channel values and a covariance matrix with M rows and N columns is obtained for each of the estimated transmission channel value groups. The N covariance matrixes are averaged over a predetermined range in terms of at least a time or a frequency (first averaging). Eigenvectors are generated based on respective N averaging outputs. Transmission channels between base station antennas and terminal antennas are generated from the eigenvectors and the estimated transmission channel values. Covariance matrixes are obtained for the generated transmission channels. The covariance matrixes are averaged over a different range from the range used in the first averaging (second averaging) and a beam forming weight is obtained by combining the generated eigenvectors.

Base station, communication system, and control method for transmission directionality at the base station

In a communication system provided with a plurality of base stations, first and second known signals are defined as known signals to be transmitted by the communication terminal. A plurality of carriers for use in transmission of the first known signal and a plurality of carriers for use in transmission of the second known signal are alternately arranged in a frequency direction in the first and second known signals in the same transmission frequency band. In each base station, at the time of transmitting a signal to a communication terminal that transmits the first known signal, the communication unit which transmits the communication terminal by use of a plurality of antennas performs null-steering in relation to transmission directivity at the plurality of antennas based on the first known signal from the communication terminal.

Rf baseband beamforming

Exemplary embodiments are directed to beamforming. A device may include a plurality of mixers, wherein each mixer is configured to receive at least one of a quadrature signal and an in-phase signal. The device may further include at least one RF phase rotator coupled to an output of each of the plurality of mixers and configured for rotating an envelope of the at least one of the quadrature signal and the in-phase signal to generate at least one of a rotated in-phase signal and a rotated quadrature signal.

Base station apparatus, user apparatus and communication control method

A base station apparatus in a radio communication system where transmit diversity is applied in uplinks includes a reference signal measurement unit configured to measure a receive level of the reference signal, a switch pitch determination unit configured to determine the antenna switch pitch of transmitting the reference signal based on the receive level measured by the reference signal measurement unit, and a transmitting unit configured to transmit the antenna switch pitch determined by the switch pitch determination unit.

Radio Base Station and Method Therein for Transmitting a Data Signal to a User Equipment in a Radio Communications Network

Embodiments herein relate to a method in a radio base station ( 12 ) for transmitting a data signal to a user equipment ( 10 ) in a radio communications network. The radio base station ( 12 ) is connected to an active antenna array of a number of active transmitting antennas and the radio base station ( 12 ) serves the user equipment ( 10 ) in the radio communications network. Each active transmitting antenna comprises sub elements. The radio base station ( 12 ) transforms a precoded data signal using a transformation, which transformation directs signals vertically. Furthermore, the radio base station ( 12 ) transmits the transformed data signal over at least one sub element to the user equipment ( 10 ). The transmitted data signal is enabled to be directed vertically, and the transformed data signal is limited to be transmitted in a direction within a range of elevation angles.

Method and system for beacon information provisioning, transmissions and protocol enhancements

A method for beacon information provisioning, transmissions and protocol enhancements includes defining multiple level beacons based on the attributes of beacon information fields/elements. A short beacon may be used in addition to a primary beacon in space-time block code (STBC) modes, non-STBC modes and in multiple bandwidth modes. The short beacons may also be used for Fast Initial Link Setup (FILS) and to extend system coverage range. Beacon transmissions may use adaptive modulation and coding set/scheme (MCS).

Method of transmitting reference signals in a wireless communication having multiple antennas

A method of transmitting signals by a transmitting end in a wireless communication system comprises sharing control information related to reference signal with a receiving end; generating one or more precoded reference signals considering a given rank; allocating the one or more precoded reference signals to have a specific pattern within a subframe, wherein the specific pattern is varied depending on the control information; and transmitting the subframe through multiple antennas to the receiving end.

Transmit Diversity Scheme

The present invention relates to methods for implementing transmit diversity in a telecommunication network. In particular there is provided an algorithm for performing transmit diversity encoding in a transmitter ( 100 ) and transmit diversity decoding in a receiver ( 1700 ) respectively. In the method processed pairs of data blocks ( 314.1 A, 314.1 B) are transmitted on a first antenna ( 112.1 ) on N sub-carriers in a first temporal order; and a second antenna ( 112.2 ) in the reverse temporal order.

Communication apparatus and communication method

Upon receipt of sounding signals from a plurality of communication devices including a communication partner device, an evaluation value processing unit calculates an evaluation value indicative of a characteristic of a transmission path based on the sounding signals from the plurality of communication devices. A transmission scheme setting unit sets, based on the evaluation value, adaptive array transmission that achieves both null steering and beamforming or beamforming dedicated transmission as a transmission scheme to the communication partner device.

Method and device for transmitting and receiving data in wireless communication system

The present invention relates to a method and device for transmitting and receiving data in a wireless communication system. Specifically, the method comprises: a step in which a relay node receives a relay physical downlink control channel (R-PDCCH) including indication information relating to at least one piece of information about a second antenna port and a second scramble ID from a base station by using information about a first antenna port and a first scramble ID; and a step in which the relay node receives a downlink data channel from the base station, wherein the downlink data channel comprises a first downlink data channel region assigned to a portion of a resource block pair to which the relay physical downlink control channel is assigned, and a second downlink data channel region assigned to the other portion of the resource block pair to which the relay physical downlink control channel is assigned, wherein the first downlink data channel region is received using the first antenna and the first scramble ID, and the second downlink data channel region is received using the indication information.

Method and device for feeding back precoding matrix indicator using interpolation

The present invention relates to a method and a device for feeding back a channel through precoding matrix indicator (PMI) interpolation. As one embodiment of the present invention, a method for feeding back a precoding matrix indicator (PMI) in a CoMP environment comprises the steps of: allowing a terminal to perform PMI interpolation by using PMIs that are included in the PMI window; allowing the terminal to select an optimum PMI by comparing the interpolated PMIs with a channel state of a current channel; and allowing the terminal to feed back the optimum PMI to a base station.

TERMINAL APPARATUS, BASE-STATION APPARATUS, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD

A base-station apparatus () and a terminal apparatus () communicate with each other in a communication system. When reporting reception quality information together with data to the base-station apparatus via a channel for use in data transmission, the terminal apparatus reports the reception quality information using a spatial multiplexing method identical to a spatial multiplexing method of the data if the reception quality information is reception quality information that is to be nonoperiodically reported, and reports the reception quality information using a spatial multiplexing method independent of the spatial multiplexing method of the data if the reception quality information is reception quality information that is to be periodically reported. When extracting the reception quality information reported together with the data from the terminal apparatus, the base-station apparatus extracts the reception quality information based on the assumption that the spatial multiplexing method of the reception quality information is identical to the spatial multiplexing method of the data if the reception quality information is nonoperiodically reported, and extracts the reception quality information based on the assumption that the spatial multiplexing method of the reception quality information is independent of the spatial multiplexing method of the data if the reception quality information is periodically reported. 112-. (canceled)13. A terminal apparatus that communicates with a base-station apparatus ,when reporting reception quality information together with data to the base-station apparatus via a channel for use in data transmission,reports partial precoder information that specifies at least one preferred candidate from among a plurality of candidates of precoders if the reception quality information is reception quality information that is to be nonoperiodically reported, andreports partial precoder information that specifies at least one preferred candidate ...

Method and apparatus for transmission mode design for extension carrier of lte advanced

A system and method includes transmission mode design for Extension Carrier of LTE-Advanced. The system includes a base station capable of communicating with subscriber stations using an extension carrier. The extension carrier is not backwards compatible and does not transmit any LTE Release 8-10 cell-specific reference signals (CRS) or Physical Downlink Control Channel. The system including transmission mode design for Extension Carrier of LTE-Advanced uses a basic demodulation reference signal transmission scheme (Basic DM-RS TS) when the PDSCH transmission uses DCI format 1A. Basic DM-RS TS uses DM-RS ports and does not uses CRS ports.

System and methods for compensation of i/q imbalance in beamforming ofdm systems

Disclosed are an system and method for compensation of I/Q imbalance in a beamforming OFDM system. The system comprises: a TX beamformer configured at a transmitter end of the beamforming OFDM system; a noise whitener configured at a receiver end of the beamforming OFDM system; and a RX MMSE configured at the receiver end of the beamforming OFDM system. At least one of the TX beamformer, the noise whitener and the RX MMSE receiver, or any combination thereof are capable of jointly processing a carrier and its image subcarrier to compensate the I/Q imbalance in the beamforming system.

Beamforming method, apparatus for polarized antenna array and radio communication device and system thereof

The invention discloses a beamforming method for polarized antenna array consisting of a plurality of antenna elements, applied to single layer beamforming or dual layer beamforming, which includes the steps: determining ( 201 ) first beamforming weights for phase compensation among the antenna elements within each polarization direction; determining ( 202 ) second beamforming weights for phase compensation between equivalent channels of two polarization directions; and calculating ( 203 ) hybrid beamforming weights as product of the first beamforming weights and the second beamforming weights. A beamforming apparatus for polarized antenna array is also provided in the invention as well as a radio communication device and a system thereof. With the invention, the single-layer and dual-layer beamforming weights are determined for the cross-polarized antenna array without requiring full channel knowledge or the aid of PMI. Computation complexity is lowered and full power amplifier utilization can be achieved.

Multi-user communication using sparse space codes

Multi-user sparse space codes are proposed as a new transmission scheme for uplink communication over a multi-user multiple-input-multiple-output (MIMO) communication channel.

Antenna selection and pilot compression in mimo systems

The disclosed embodiments relate to a system that facilitates antenna selection and pilot reduction in a multi-antenna system. During operation, in response to an activating event, the system performs a full pilot transmission by transmitting pilot signals through all available transmit antennas at a base station. The system then determines the selected subset of transmit antennas by receiving lists of selected antennas from mobile stations associated with preferred users, wherein a given mobile station selects a list of antennas in response to pilot signals received during the full pilot transmission. The system then combines the received lists to produce the selected subset, wherein the selected subset includes all antennas which appear in the received lists of selected antennas. Next, during normal system operation, the system periodically performs a selected pilot transmission by transmitting pilot signals through a selected subset of the available transmit antennas.

Transmission control

User equipment, a computer program product and method of setting antenna transmission weightings of user equipment in a wireless telecommunication network. The user equipment (vE 1 ) is operable to transmit on at least two antenna and communicate with at least two base stations (NB 1 , NB 2 ) in its active set. The method employed by the user equipment and computer program product comprises the steps of: receiving an indication of preferred antenna transmission weightings (W 1 ,W 2 ) from at least two base stations in said active set associated with said user equipment, calculating from said received indications of preferred antenna transmission weightings, an indication of compromise antenna transmission weightings which minimise the difference between said indication of compromise antenna transmission weightings and said indication of preferred antenna transmission weightings received from the base stations in said active set and setting said antenna transmission weightings in accordance with said calculated indication of compromise antenna transmission weightings.

Hierarchical channel sounding and channel state information feedback in massive mimo systems

Time, frequency and spatial processing parameters for communications between a base station and a mobile station are selected by transmitting synchronization signals in multiple slices of a wireless transmission sector for the base station, and receiving feedback from the mobile station of at least one preferred slice of the multiple slices. In response to selection of one of the slices as an active slice for communications between the base station and the mobile station, reference signals are transmitted in the selected active slice using a corresponding selected precoder and/or codebook. The mobile station estimates and feeds back channel state information (CSI) based on those reference signals, and the CSI is then employed to determine communication parameters for communications between the base station and mobile station that are specific to the mobile station.

Methods and arrangements for wideband precoding

The present invention relates to a network node and a mobile node, and to related methods for wideband precoding. The methods comprise determining a phase compensation vector which is frequency dependent for the at least one predefined precoding weight vector in a precoding codebook for multi-antenna transmission. The methods further comprise determining a second precoding weight vector which is phase compensated by multiplying the at least one predefined precoding weight vector by the phase compensation vector.