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

被引：0
|
作者：
CHEN Zhi-yong
机构：
来源：
The Journal of China Universities of Posts and Telecommunications | 2009年 / 16卷 / 05期
基金：
中国国家自然科学基金;
关键词：
MU-MIMO; channel inversion precoding; CQI feedback; AMC; lower bound SINR; zero-forcing;
D O I：
暂无
中图分类号：
TN919.72 [无线数据通信];
学科分类号：
0810 ; 081001 ;
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.
引用
收藏
页码：20 / 24
页数：5
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