An Enhanced Jacobi Precoder for Downlink Massive MIMO Systems  

作　　者：Park Chan-Yeob Hyun-Ro Jae Jun-Yong Jang Song Hyoung-Kyu 

机构地区：[1]Department of Information and Communication Engineering,and Convergence Engineering for Intelligent Drone,Sejong University,Seoul,05006,Korea

出　　处：《Computers, Materials & Continua》2021年第7期137-148,共12页计算机、材料和连续体（英文）

基　　金：supported by the MSIT(Ministry of Science and ICT),Korea,under the ITRC(Information Technology Research Center)support program(IITP-2019-2018-0-01423);supervised by the IITP(Institute for Information&communications Technology Promotion);supported by the Basic Science Research Program through the National Research Foundation of Korea(NRF);funded by the Ministry of Education(2020R1A6A1A03038540).

摘　　要：Linear precoding methods such as zero-forcing(ZF)are near optimal for downlink massive multi-user multiple input multiple output(MIMO)systems due to their asymptotic channel property.However,as the number of users increases,the computational complexity of obtaining the inverse matrix of the gram matrix increases.Forsolving the computational complexity problem,this paper proposes an improved Jacobi(JC)-based precoder to improve error performance of the conventional JC in the downlink massive MIMO systems.The conventional JC was studied for solving the high computational complexity of the ZF algorithm and was able to achieve parallel implementation.However,the conventional JC has poor error performance when the number of users increases,which means that the diagonal dominance component of the gram matrix is reduced.In this paper,the preconditioning method is proposed to improve the error performance.Before executing the JC,the condition number of the linear equation and spectrum radius of the iteration matrix are reduced by multiplying the preconditioning matrix of the linear equation.To further reduce the condition number of the linear equation,this paper proposes a polynomial expansion precondition matrix that supplements diagonal components.The results show that the proposed method provides better performance than other iterative methods and has similar performance to the ZF.

关 键 词：Jacobi(JC) massive MIMO PRECONDITION polynomial expansion linear precoding 

分 类 号：TN9[电子电信—信息与通信工程]