中国邮电高校学报(英文) ›› 2007, Vol. 14 ›› Issue (3): 28-33.doi: 1005-8885 (2007) 03-0028-06

• Wireless • 上一篇    下一篇

Multiuser beamforming based on max SINR for downlink spatial multiplexing MIMO

马鹏飞; 郑侃; 王文博   

  1. Wireless Signal Processing and Network Laboratory, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • 收稿日期:2006-12-22 修回日期:1900-01-01 出版日期:2007-09-30

Multiuser beamforming based on max SINR for downlink spatial multiplexing MIMO

MA Peng-fei; ZHENG Kan; WANG Wen-bo   

  1. Wireless Signal Processing and Network Laboratory, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2006-12-22 Revised:1900-01-01 Online:2007-09-30

摘要:

In this article, a method based on max signal interference noise ratio (SINR) criterion is proposed, to mitigate the interuser interference for downlink multiuser spatial multiplexing multi-input multi-output (MIMO) systems. Unlike the zero forcing (ZF) scheme in which the SNR is decreased when the interference is eliminated completely, max SINR method makes a compromise between noise and interuser interference. When the number of substreams is larger than the difference between the number of base station antennas and the sum of interference mobile station antennas, the ZF is infeasible. An existing coordinated TX-RX block diagonalization (COOR BD) method uses preprocessing at the receiver to cancel the interuser interference. However, it cannot obtain more receive diversity gain because of the preprocessing. Analysis and simulation show that the max SINR scheme has better performance than the ZF method. Moreover, when the ZF is infeasible, the max SINR scheme can obtain more receive diversity gain than COOR BD in the two-user case.

关键词:

array signal processing; beamforming; MIMO systems; spatial multiplexing

Abstract:

In this article, a method based on max signal interference noise ratio (SINR) criterion is proposed, to mitigate the interuser interference for downlink multiuser spatial multiplexing multi-input multi-output (MIMO) systems. Unlike the zero forcing (ZF) scheme in which the SNR is decreased when the interference is eliminated completely, max SINR method makes a compromise between noise and interuser interference. When the number of substreams is larger than the difference between the number of base station antennas and the sum of interference mobile station antennas, the ZF is infeasible. An existing coordinated TX-RX block diagonalization (COOR BD) method uses preprocessing at the receiver to cancel the interuser interference. However, it cannot obtain more receive diversity gain because of the preprocessing. Analysis and simulation show that the max SINR scheme has better performance than the ZF method. Moreover, when the ZF is infeasible, the max SINR scheme can obtain more receive diversity gain than COOR BD in the two-user case.

Key words:

array signal processing; beamforming; MIMO systems; spatial multiplexing

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