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应用科学学报

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MIMO 广播信道中信噪比优化的用户选择

王 静，王 炎, 尤肖虎
  

  1. 东南大学 移动通信国家重点实验室，江苏 南京 210096
  • 收稿日期:2007-10-10 修回日期:2007-12-26 出版日期:2008-05-31 发布日期:2008-05-31

SNR-Optimized User Selection Scheme in MIMO Broadcast Channels

WANG Jing, WANG Yan, YOU Xiao－hu   

  1. National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China
  • Received:2007-10-10 Revised:2007-12-26 Online:2008-05-31 Published:2008-05-31

被引次数

10

摘要： 当MIMO广播系统中存在很多用户时，需要进行用户选择。该文考虑基站端信道信息需从用户端反馈的频分复用系统，提出基于系统平均信噪比优化准则的用户选择算法。首先采用预设门限，将信道增益大于此门限的用户瞬时信道信息反馈至发送端。然后基站端从待选用户集合中选择一组用户，使得相应信道矩阵的最小特征值最大。所提算法可以达到满的复用增益，同时还能得到满意的和容量和BER性能。与穷举法相比，由于采用预设门限，使得信道信息的反馈量和基站在候选用户中进行选择的次数有明显降低。

关键词: 用户选择, 多天线广播信道, 和容量, 反馈量

Abstract: In this paper, we investigate the user selection algorithm in MIMO BC systems with many users. Consider frequency division duplex (FDD) systems, where channel state information (CSI) at the base station is obtained via feedback mechanisms from the users. An algorithm aiming to optimize the average signal-to-noise ratio (SNR) is presented. After setting a threshold value, only users whose channel gains are above the set threshold are considered. Among these candidate users, the transmitter selects a set of users whose minimum eigenvalue is maximal among the possible user sets. The proposed algorithm can achieve the full multiplex gain and get a desirable sum capacity and BER performance. Meanwhile, compared with the exhaustive search scheme, the system overheads, such as the amount of feedback and number of selections in the base station, decrease evidently.

Key words:

user selection, MIMO BC systems, sum capacity, amount of the feedback