Invention Grant
- Patent Title: Quantized precoding for 2TX multiple antenna systems
- Patent Title (中): 2TX多天线系统的量化预编码
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Application No.: US13155861Application Date: 2011-06-08
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Publication No.: US08254998B2Publication Date: 2012-08-28
- 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 Joseph Kolodka; Akitaka Kimura
- Main IPC: H04M1/00
- IPC: H04M1/00

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.
Public/Granted literature
- US20110268213A1 Quantized Precoding For 2TX Multiple Antenna Systems Public/Granted day:2011-11-03
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