Abstract:
PURPOSE: A phase compensating matrix calculation method and feedback method thereof for multi cell cooperation transmission are provided to fix a phase compensation matrix in a block diagonal structure. CONSTITUTION: An estimating unit(410) estimates a first channel between a serving base station and an object terminal and a second channel between an object terminal and a neighboring base center. A calculating unit calculates a first precoding vector and a second precoding vector based on the channels. A determining unit(430) determines a phase compensating matrix having a block diagonal structure based on the first predocing vector and the second precoding vector.
Abstract:
PURPOSE: A scheduling apparatus at an orthogonal frequency division multiple access system and a scheduling method thereof are provided to allocate a user of maximum channel quality to a subchannel block having a maximum channel quality difference by comparing channel quality differences at different subchannel blocks. CONSTITUTION: The whole numbers of subchannel blocks are set to be the same as that of users(S200). The selection reference value of the subchannel blocks is calculated(S202). An allocation subchannel block and the user are selected(S204). A process for determining whether allocation is performed or not is operated(S206,S210,S212). An allocation process is operated(S208,S214). An allocable subchannel block, subchannel block combination which is pre-allocated, and subchannel block combination which is not allocated according to a user are updated by reflecting a current allocation result(S216). An update procedure includes an allocable subchannel block range update process according to the user, an allocable subchannel block user updating process, and a verification process of unallocated subchannel block.
Abstract:
PURPOSE: A device and a method for delivering channel information of a wireless relay network are provided to simultaneously obtain channel quality signals between a terminal and a repeater, thereby improving system throughput. CONSTITUTION: A channel estimation device(210) estimates a channel value between a terminal and a repeater. The channel estimation device converts the channel value into CQI(Channel Quality Information). A CQI estimation device(330) performs linear prediction. The CQI estimation device obtains channel quality information between the repeater and the terminal. The channel estimation device(340) estimates channel quality information between a base station and the repeater.
Abstract:
다중 안테나 인지 라디오 시스템에서 간섭 채널 정보 교환을 바탕으로 한 효율적인 초기 백색화 전송 방법 및 장치가 제시된다. 본 발명에서 제안하는 다중 안테나 인지 라디오 시스템에서 간섭 채널 정보 교환을 바탕으로 한 효율적인 초기 백색화 전송 방법은 제1 시스템과 제2 시스템 사이의 간섭 링크에 대한 채널 정보 공유가 가능할 경우, 상기 제2 시스템의 제2 송신부가 상기 제1 시스템으로부터 제공된 간섭 채널의 방향 정보만을 이용하여 프리코딩을 수행하는 단계, 상기 프리코딩을 통해 상기 제1 시스템과 상기 제2 시스템 사이에 채널 정보를 교환하는 단계를 포함할 수 있다.
Abstract:
An apparatus and a method for allocating a sub channel in an orthogonal frequency division multiplexing access system are provided to improve performance of a system by allocating an adaptive sub channel to a channel state by changing the number of the carrier groups adaptively according to a channel environment. A base station receives the number of each carrier in cluster which each terminal feeds back(600). The base station confirms and selects the carrier in cluster which the largest terminal(602). The sub channel is comprised by selecting a sub carrier adjacent as much as the carrier in cluster by using the selected carrier in cluster(604). The modulated complex symbols are mapped to the subcarrier to correspond to the previously comprised sub channel(606). The mapped complex symbols are inverse fast Fourier Transformed and are converted into the sample data. The mapped complex symbols are transmitted to the terminal after an RF process(608).
Abstract:
PURPOSE: A communication apparatus and communication method for the dynamic control of a multi-cell cooperation transmission are provided to dynamically control the cooperation transmission of base stations according to a used code book and beam phase compensation. CONSTITUTION: A determining unit determines whether two or more base stations cooperate with each other(210). A precoding matrix determining unit calculates each precoding matrix of the base station(220). A gain efficiency calculating unit calculates the gain efficiency due to the cooperation transmission of the base station based on the precoding matrix(230).
Abstract:
PURPOSE: A scheduling apparatus at an orthogonal frequency division multiple access system and a scheduling method thereof are provided to allocate a user of maximum channel quality to a subchannel block having a maximum channel quality difference by comparing channel quality differences at different subchannel blocks. CONSTITUTION: The whole numbers of subchannel blocks are set to be the same as that of users(S200). The selection reference value of the subchannel blocks is calculated(S202). An allocation subchannel block and the user are selected(S204). A process for determining whether allocation is performed or not is operated(S206,S210,S212). An allocation process is operated(S208,S214). An allocable subchannel block, subchannel block combination which is pre-allocated, and subchannel block combination which is not allocated according to a user are updated by reflecting a current allocation result(S216). An update procedure includes an allocable subchannel block range update process according to the user, an allocable subchannel block user updating process, and a verification process of unallocated subchannel block.
Abstract:
본 발명은 중계기를 사용하는 이동통신 시스템에서 단말기와 중계기 간의 채널품질정보를 교환하기 위해 별도의 물리적 채널을 구축하거나 추가적으로 신호를 전송하지 않고도 기지국에서 중계기와 기지국 간의 채널품질정보는 물론 단말기와 중계기 간의 채널품질정보를 획득할 수 있도록 한 기술에 관한 것이다. 이러한 본 발명은 단말기로부터 수신된 파일럿신호를 근거로 단말기와 중계기 간의 채널값을 추정하여 채널품질정보로 변환출력하는 채널 추정장치와; 상기 단말기와 중계기 간의 채널품질정보와 중계기에서 중계기와 기지국 간의 채널 품질 측정을 위해 전송하는 파일럿신호를 네트워크 부호화하여 기지국 측으로 전송하는 네트워크 부호화기와; 상기 중계기의 네트워크 부호화기로부터 수신된 신호와 파일럿신호를 복호화하여 상기 채널품질정보를 획득하는 네트워크 복호화기와; 상기 네트워크 복호화기의 출력신호에 대해 선형 예측을 수행하여 단말기와 중계기 간의 채널품질정보를 획득하는 채널품질정보 추정기와; 상기 단말기와 중계기 간의 채널품질정보와 중계기로부터의 수신신호를 이용하여 중계기와 기지국 간의 채널품질정보를 추정하는 채널 추정기를 포함하여 구성하는 것에 의해 달성된다. 중계기, 채널품질정보, 네트워크부호화