Invention Grant
US08391925B2 Method of precoding with a codebook for a wireless system with multiple transmission ranks and a quantized beamforming matrix 有权
用于具有多个传输级别的无线系统的码本和量化波束形成矩阵的预编码方法

  • Patent Title: Method of precoding with a codebook for a wireless system with multiple transmission ranks and a quantized beamforming matrix
  • Patent Title (中): 用于具有多个传输级别的无线系统的码本和量化波束形成矩阵的预编码方法
  • Application No.: US13029561
    Application Date: 2011-02-17
  • Publication No.: US08391925B2
    Publication Date: 2013-03-05
  • Inventor: Mohammad A. Khojastepour
  • Applicant: Mohammad A. Khojastepour
  • Applicant Address: US NJ Princeton
  • Assignee: NEC Laboratories America, Inc.
  • Current Assignee: NEC Laboratories America, Inc.
  • Current Assignee Address: US NJ Princeton
  • Agent Akitaka Kimura; Joseph Kolodka
  • Main IPC: H04M1/00
  • IPC: H04M1/00
Method of precoding with a codebook for a wireless system with multiple transmission ranks and a quantized beamforming matrix
Abstract:
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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