Channel puncturing based low-complexity belief propagation detection for multi-user MIMO systems  

作　　者：Cai Xingwei Ji Wei Qiu Ling Liang Xiaowen 

机构地区：[1]Key Laboratory of Wireless-Optical Communications,Chinese Academy of Sciences,School of Information Science and Technology,University of Science and Technology of China,Hefei 230026,China

出　　处：《The Journal of China Universities of Posts and Telecommunications》2020年第6期8-16,共9页中国邮电高校学报（英文版）

基　　金：This work was supported bythe National Natural Science Foundation of China(61672484).

摘　　要：A low complexity punctured belief propagation(BP)detection utilizing channel puncturing for multi-user multiple-input multiple-output(MU-MIMO)systems is proposed in this paper.This paper constructs a cycle-free fator graph by puncturing certain non-zero entries in a transformed channel matrix,and proposes an adjusted BP algorithm with a more exact a posteriori message updating equation.The proposed algorithm converges rapidly in several iterations due to the cycle-free structure in the factor graph.Nevertheless,puncturing brings distorted noise and thus leads to performance degradation.To tackle this issue,this article further designs a layered detection with the help of maximum likelihood detector(MLD).Simulations demonstrate that the proposed detection algorithm achieves the identical performance to MLD with much lower complexity.

关 键 词：MU-MIMO rich scattering wireless environment BP layered DETECTION algorithm 

分 类 号：TN929.5[电子电信—通信与信息系统]