R bits user selection switch feedback for zero forcing MU-MIMO based on low rate codebook

被引：0
作者：
Shiyuan Li
Qimei Cui
Xiaofeng Tao
Xin Chen
机构：
[1] Beijing University of Posts and Telecommunications (BUPT),Wireless Technology Innovation (WTI) Institute, Key Laboratory of Universal Wireless Communications, Ministry of Education
来源：
EURASIP Journal on Wireless Communications and Networking | / 2012卷
关键词：
MU-MIMO; feedback; user slection; user pairing;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Channel feedback for multi-user (MU)-multiple-input multiple-output (MIMO) has been widely studied and some results have been got with random vector quantization scheme. However, while the low rate fixed codebook feedbacks are adopted, the performance of zero forcing (ZF) MU-MIMO will decrease as the unpredictable inter-user interference is introduced because of quantized channel state information (CSI). To decrease inter-user interference in low rate fixed codebook feedback, an enhanced user selection switch (USS) feedback scheme for ZF MU-MIMO is proposed in this article. In USS feedback, the extra USS information is added after quantized CSI and received signal-to-noise ratio feedback. The USS information indicates inter-user interference and it can be used in user selection procedure to avoid large inter-user interference. Simulation results show that the proposed USS feedback scheme is efficient to solve the problems of unpredictable inter-user interference in conventional feedback scheme with low rate codebook in ZF MU-MIMO.
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