发明申请
- 专利标题: WIRELESS COMMUNICATION APPARATUS
- 专利标题(中): 无线通信设备
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申请号: US12052405申请日: 2008-03-20
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公开(公告)号: US20080311859A1公开(公告)日: 2008-12-18
- 发明人: Vishakan Ponnampalam , Magnus Stig Torsten Sandell
- 申请人: Vishakan Ponnampalam , Magnus Stig Torsten Sandell
- 申请人地址: JP Tokyo
- 专利权人: KABUSHIKI KAISHA TOSHIBA
- 当前专利权人: KABUSHIKI KAISHA TOSHIBA
- 当前专利权人地址: JP Tokyo
- 优先权: GB0705343.2 20070320
- 主分类号: H04B7/00
- IPC分类号: H04B7/00
摘要:
Channel estimation in a MIMO communications system comprises performing a decomposition of an initial channel matrix estimate associated with a first subcarrier of a plurality thereof defined in the channel to identify eigenvectors associated with that subcarrier of the received signal, and defining a first beamforming transformation to be applied to the received signal on the basis of the eigenvectors. Then, for each of the other subcarriers, an additional decomposition is performed in order to determine a further beamforming transformation for each of said one or more other subcarriers, wherein said additional decompositions are carried out incrementally such that information determined in one of said decompositions contributes to a later executed decomposition. Further described is a method of transmitting from a multiple antenna transmitter defining a plurality of subcarriers in space, and time or frequency, comprising the same iterative process. This transmitting can be carried out using smoothed beamforming applied in accordance with aspects of the invention.