Abstract:
본 발명은 다중 입출력 무선통신 시스템에서 단말기의 빔 성형(beamforming)에 관한 것으로, 단말기의 동작은, 다수의 빔 성형 가중치 벡터들 각각을 통해 빔 성형된 사운딩 신호들을 순차적으로 송신하는 과정과, 상기 사운딩 신호들을 이용하여 기지국에 의해 결정된 상향링크 가중치 벡터 및 최대 채널 품질 값을 나타내는 제어 정보를 수신하는 과정과, 상기 상향링크 가중치 벡터에 따라 빔 성형된 송신 신호를 다수의 안테나들을 통해 송신하는 과정을 포함하여, 단말기의 빔 성형을 통해 채널 품질을 최대화할 수 있고, 특히, 상기 단말기의 빔 성형에 기반하여 상향링크 공간분할 다중 접속을 수행함으로써 상향링크의 전송용량을 극대화할 수 있다 MIMO, 빔 성형, 공간분할 다중 접속, 무선통신 시스템
Abstract:
PURPOSE: A device and a method for suppressing interference between adjacent sectors in a communication system based uplink SDMA are provided to perform cooperation scheduling and uplink power control in a communication system based on uplink SDMA, thereby suppressing interference between adjacent sectors. CONSTITUTION: A path loss determining unit receives a downlink signal from adjacent sectors and determines average receiving power per each sector(202). The path loss determining unit calculates average downlink path loss per each sector using the average receiving power per each sector(204). A transmission power determining unit determines maximum transmission power from the downlink path loss per each sector based on minimum path loss. A controller transmits the determined maximum transmission power to a base station.
Abstract:
PURPOSE: An apparatus and a method for uplink beam forming and space-division multiple access in a multi-input multi-output wireless communication system are provided to form a beam, thereby maximizing an SINR(Signal to Interference Noise Ratio). CONSTITUTION: An apparatus for uplink beam forming and space-division multiple access in a multi-input multi-output wireless communication system includes a generator, one transmission RF chain(116), an RF switch(117), and beam formers(118). The generator generates an uplink signal. The transmission RF chain converts a baseband signal from the generator to a signal of an RF band. The RF switch switches an RF signal from the transmission RF chain to one among the beam formers. One of the beam former multiplies the RF signal from the RF switch with a corresponding weight vector and transmits it through antennas(101,102,103).
Abstract:
본 발명은 다중 입출력(MIMO : Multiple Input Multiple Output) 무선통신 시스템에 관한 것으로, 수신단은, 송신단과의 각 서브밴드(Subband)별 채널을 추정하는 추정부와, 상기 채널 정보를 이용하여 공간 상관 행렬을 산출하는 산출부와, 상기 공간 상관 행렬 및 상기 채널 정보를 이용하여 송신단의 프리코딩(Precoding)에 사용될 단위(Unitary) 프리코딩 행렬을 선택하는 선택부를 포함하여, 프리코딩 시 각 서브밴드에 대해 동일한 단위 프리코딩 행렬의 열 벡터를 조합하여 사용함으로써, 시스템은 적은 양의 피드백으로 높은 채널 용량을 유지할 수 있다. 다중 입출력(MIMO : Multiple Input Multiple Output), 코드북(Codebook), 프리코딩 행렬(Precoding Matrix), 열 벡터(Column Vector)
Abstract:
PURPOSE: A power control device for minimizing uplink interference of an indoor base station in a mobile communication system and a method thereof are provided to minimize the interference about outdoor user and transmit uplink data of high quality. CONSTITUTION: A power control device for minimizing uplink interference of an indoor base station in a mobile communication system and a method thereof are as follows. An interference and noise level information are acquired from the outdoor base station(302). The maximum permissible interference amount of the inside of a user terminal is adaptively controlled according to an interference and noise level. The maximum transmission electric power of the inside of the user terminal is calculated by the maximum permissible interference amount of the inside(316).
Abstract:
A precoding apparatus in a MIMO(Multiple Input Multiple Output) wireless communication system and a method thereof are provided to maintain high channel capacity with a small amount of feedback information by combining and using column vectors of an identical unitary precoding matrix for each subband in precoding in a MIMO wireless communication system. A receiving block in a MIMO wireless communication system comprises a channel estimation part(112), a correlation matrix calculation part(114), and a codebook selection part(116). The channel estimation part estimates a channel with a transmitting block for each subband. Based on the channel information estimated by the channel estimation part, the correlation matrix calculation part produces a spatial correlation matrix. Using the spatial correlation matrix and the channel information, the codebook selection part selects a unitary precoding matrix to be used for the precoding of the transmitting block.