去蜂窝大规模MIMO系统中预编码算法研究  

Precoding algorithm for cell-free massive MIMO system

作　　者：朱翠涛[1] 赵瑶 ZHU Cuitao;ZHAO Yao(Hubei Key Lab. of Intelligent Wireless Communications, South-Central University for Nationalities,Wuhan 430074, China)

机构地区：[1]中南民族大学智能无线通信湖北省重点实验室,武汉430074

出　　处：《中南民族大学学报（自然科学版）》2021年第4期381-386,共6页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：国家自然科学基金资助项目(61671483);湖北省自然科学基金资助项目(2016CFA089)。

摘　　要：为降低去蜂窝大规模MIMO系统中预编码算法复杂度,提出一种基于Neumann级数的低复杂度预编码算法.该算法首先计算信道矩阵转置与信道矩阵共轭的乘积得到正定Hermitian矩阵,接着根据Neumann级数收敛条件,对正定Hermitian矩阵进行加权处理,最后通过Neumann级数多项式展开近似获得正定Hermitian矩阵的逆矩阵.仿真结果表明,此算法在保持频谱效率稳定的同时降低了预编码算法的复杂度.In order to reduce the complexity of precoding algorithm in cell-free massive MIMO system,a low-complexity precoding algorithm based on Neumann series is proposed.The algorithm calculates the product of the channel matrix transpose and the channel matrix conjugate to obtain a positive definite Hermitian matrix,then weights the positive definite Hermitian matrix according to the convergence condition of the Neumann series,and finally the inverse matrix of the positive definite Hermitian matrix is obtained approximately by the Neumann series polynomial expansion.Simulation results show that this method reduces the complexity of the precoding algorithm while maintaining the stability of spectrum efficiency.

关 键 词：去蜂窝大规模MIMO Neumann级数预编码 HERMITIAN矩阵 

分 类 号：TN929.5[电子电信—通信与信息系统]