发明授权
US07917176B2 Structured codebook and successive beamforming for multiple-antenna systems
有权
结构化码本和多天线系统的连续波束成形
- 专利标题: Structured codebook and successive beamforming for multiple-antenna systems
- 专利标题(中): 结构化码本和多天线系统的连续波束成形
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申请号: US11674330申请日: 2007-02-13
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公开(公告)号: US07917176B2公开(公告)日: 2011-03-29
- 发明人: Mohammad Ali Khojastepour , Xiaodong Wang , Mohammad Madihian
- 申请人: Mohammad Ali Khojastepour , Xiaodong Wang , Mohammad Madihian
- 申请人地址: US NJ Princeton
- 专利权人: NEC Laboratories America, Inc.
- 当前专利权人: NEC Laboratories America, Inc.
- 当前专利权人地址: US NJ Princeton
- 代理机构: Brosemer, Kolefas & Associates
- 代理商 Joseph Kolodka
- 主分类号: H04B1/02
- IPC分类号: H04B1/02
摘要:
A quantized multi-rank beamforming scheme for multiple-antenna systems such as a multiple-input-multiple-output (MIMO) wireless downlink. User equipment (UE) estimates downlink channel and transmit power and determines rank and power allocations. A quantized beamforming matrix is then determined by the UE using successive beamforming. The UE also determines channel quality indices (CQI) which it feeds-back to the wireless downlink base station along with the index of the quantized beamforming matrix. The base station uses the CQI information to select a UE for scheduling of downlink transmission and the quantized beamforming matrix index received from the selected UE to beamform the downlink transmission to the UE. Base station overhead and is minimized while providing near-optimal performance given the constraints of a limited feed-back channel and computational complexity of the UE.
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