• 移动互联与通信技术 •

### 大规模MIMO系统中基于Lanczos方法的低复杂度预编码

1. 1.杭州电子科技大学 通信工程学院,杭州 310018; 2.中国计量大学 信息工程学院,杭州 310018
• 收稿日期:2017-10-26 出版日期:2019-02-15 发布日期:2019-02-15
• 作者简介:曹海燕(1975—),女,副教授、博士,主研方向为无线通信;周冬,硕士研究生;方昕,副教授;王秀敏,教授。
• 基金项目:

国家自然科学基金(61501158,61379027);浙江省自然科学基金(LY14F010019,LQ15F01004)。

### Low Complexity Precoding Based on Lanczos Method in Massive MIMO System

CAO Haiyan 1,ZHOU Dong 1,FANG Xin 1,WANG Xiumin 2

1. 1.Institute of Communications Engineering,Hangzhou Dianzi University,Hangzhou 310018,China; 2.Institute of Information Engineering,China Jiliang University,Hangzhou 310018,China
• Received:2017-10-26 Online:2019-02-15 Published:2019-02-15

Abstract:

Aiming at the problem that the computational complexity of the required matrix inversion of Zero Forcing(ZF) precoding matrix is very high due to the large number of antennas and users in large-scale MIMO systems,a low complexity ZF precoding scheme based on Lanczos Method(LM) is proposed.In the proposed iterative algorithm,according to the channel matrix of massive MIMO systems which has diagonally dominant characteristics,the first term of the Neumann series of the inverse of the channel large matrix is taken as the initial value of the iteration,that speeds up the convergence rate of the algorithm,and the complexity of ZF precoding can be reduced from O(K3) to O(K2).Simulation results show that the algorithm approaches the channel capacity and Bit Error Rate (BER) of traditional ZF precoding scheme with fast convergence speed.