大规模MIMO系统中基于权重二对角迭代的低复杂度预编码

doi:10.11959/j.issn.1000-0801.2018187

电信科学 ›› 2018, Vol. 34 ›› Issue (9): 63-69.doi: 10.11959/j.issn.1000-0801.2018187

大规模MIMO系统中基于权重二对角迭代的低复杂度预编码

曹海燕¹,周冬¹,许方敏¹,方昕¹,王秀敏²

¹ 杭州电子科技大学通信工程学院，浙江杭州 310018
² 中国计量大学信息工程学院，浙江杭州 310018

出版日期:2018-09-20 发布日期:2018-10-12
基金资助:
国家自然科学基金资助项目;国家自然科学基金资助项目;浙江省自然科学基金资助项目;浙江省自然科学基金资助项目

A low complexity precoding based on weighted two diagonal iteration in massive MIMO system

Haiyan CAO¹,Dong ZHOU¹,Fangmin XU¹,Xin FANG¹,Xiumin WANG²

¹ Telecommunication Engineering School,Hangzhou Dianzi University,Hangzhou 310018,China
² Information Engineering School,China Jiliang University,Hangzhou 310018,China

Online:2018-09-20 Published:2018-10-12
Supported by:
The National Natural Science Foundation of China;The National Natural Science Foundation of China;Education Department Foundation of Zhejiang Province of China;Education Department Foundation of Zhejiang Province of China

摘要/Abstract

摘要：

大规模MIMO系统中由于系统下行链路的迫零（zero forcing，ZF）预编码中存在大矩阵求逆运算，随着用户数与天线数的增加，其复杂度随之增加。为了降低复杂度，提出了一种基于雅克比（Jacobi）迭代算法的改进预编码算法，用下二对角矩阵作为迭代矩阵，并且将迭代结果与上一步迭代结果进行权重相加来加速迭代。根据大规模MIMO系统信道矩阵的对角占优特性，将矩阵求逆的诺依曼近似的第一项作为迭代的初始值进一步加速迭代。相比于传统迫零预编码方案，提出的方案可以降低一个量级的算法复杂度，并且保证了预编码方案的性能。

关键词: 大规模MIMO, 雅克比迭代, ZF预编码, 低复杂度, 权重二对角迭代

Abstract:

In massive MIMO systems,with the increase of the number of users and antennas,the complexity of the downlink zero forcing (ZF) precoding increases due to the existence of large matrix inversion.In order to reduce the complexity,an improved weighted two diagonal iteration precoding algorithm based on the Jacobi iterative algorithm was proposed.The low-two diagonal matrix was taken as iterative matrix,and the iterative results were weighed addition with the last results to accelerate the convergence speed of the iteration.According to the diagonally dominant characteristic of channel matrix in massive MIMO systems,the first term of the Neumann approximation of matrix inversion was used as the initial value of the iteration to accelerate the iteration further.Compared with the traditional ZF precoding,the proposed scheme can reduce the complexity with an order of magnitude and ensure the performance of the precoding scheme.

Key words: massive MIMO, Jacobi iteration, zero forcing precoding, low complexity, weighted two diagonal iteration

曹海燕,周冬,许方敏,方昕,王秀敏. 大规模MIMO系统中基于权重二对角迭代的低复杂度预编码[J]. 电信科学, 2018, 34(9): 63-69.

Haiyan CAO,Dong ZHOU,Fangmin XU,Xin FANG,Xiumin WANG. A low complexity precoding based on weighted two diagonal iteration in massive MIMO system[J]. Telecommunications Science, 2018, 34(9): 63-69.

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迭代次数	RM	JAC	G-JAC	WTM
i= 2	2(4K ²+8K)	8K ²	16K ²+8K	2(4K ²+8K)+4K
i=3	3(4K ²+8K)	12K ²	20K ²+8K	3(4K ²+8K)+4K
i=4	4(4K ²+8K)	16K ²	24K ²+8K	4(4K ²+8K)+4K
i=5	5(4K ²+8K)	20K ²	28K ²+8K	5(4K ²+8K)+4K

大规模MIMO系统中基于权重二对角迭代的低复杂度预编码

A low complexity precoding based on weighted two diagonal iteration in massive MIMO system

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