Performance evaluation of channel inversion precoding for 
downlink multi-user MIMO system

doi:10.1016/S1005-8885(08)60263-0

中国邮电高校学报(英文) ›› 2009, Vol. 16 ›› Issue (5): 20-24.doi: 10.1016/S1005-8885(08)60263-0

Performance evaluation of channel inversion precoding for
downlink multi-user MIMO system

陈智勇，王文博，彭木根, 李韧

Wireless Signal Processing and Network Laboratory, Key Laboratory of Universal Wireless Communication, Ministry of Education,
Beijing University of Posts and Telecommunications, Beijing 100876, China

收稿日期:2008-10-20 修回日期:1900-01-01 出版日期:2009-10-30
通讯作者: 陈智勇

Performance evaluation of channel inversion precoding for
downlink multi-user MIMO system

CHEN Zhi-yong ,WANG Wen-bo, PENG Mu-gen, LI Ren

Wireless Signal Processing and Network Laboratory, Key Laboratory of Universal Wireless Communication, Ministry of Education,
Beijing University of Posts and Telecommunications, Beijing 100876, China

Received:2008-10-20 Revised:1900-01-01 Online:2009-10-30
Contact: CHEN Zhi-yong

摘要/Abstract

摘要：

In downlink multi-user multi-input multi-output (MU-MIMO) system, not every user (user equipment (UE)) can calculate accurately signal to interference and noise ratio (SINR) without prior knowledge of the other users’ precoding vector. To solve this problem, this article proposes a channel inversion precoding scheme by using the lower bound of SINR and zero-forcing (ZF) algorithm. However, the SINR mismatch between lower bound SINR and actual SINR causes the inaccurateness of adaptive modulation and coding (AMC). As a result, it causes degradation in performance. Simulation results show that channel inversion precoding provides lower throughput than that of single user multi-input multi-output (SU-MIMO) at high signal-to-noise ratio (SNR) (>14 dB), due to the SINR mismatch, although the sum-rate of channel inversion precoding is higher than that of SU-MIMO at full SNR regime.

关键词:

MU-MIMO,;channel;inversion;precoding,;CQI;feedback,;AMC,;lower;bound;SINR,;zero-forcing;

Abstract:

Key words:

MU-MIMO, channel inversion precoding, CQI feedback, AMC, lower bound SINR, zero-forcing

CHEN Zhi-yong ,WANG Wen-bo, PENG Mu-gen, LI Ren. Performance evaluation of channel inversion precoding for
downlink multi-user MIMO system[J]. Acta Metallurgica Sinica(English letters), 2009, 16(5): 20-24.

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Performance evaluation of channel inversion precoding for
downlink multi-user MIMO system

Performance evaluation of channel inversion precoding for
downlink multi-user MIMO system

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Performance evaluation of channel inversion precoding for downlink multi-user MIMO system

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Performance evaluation of channel inversion precoding for
downlink multi-user MIMO system

Performance evaluation of channel inversion precoding for
downlink multi-user MIMO system