DocumentCode :
76841
Title :
Low-complexity ZF precoding method for downlink of massive MIMO system
Author :
Yuwei Ren ; Guixian Xu ; Yingmin Wang ; Xin Su ; ChuanJun Li
Author_Institution :
Sch. of Inf. & Commun. Eng., Beijing Univ. of Posts & Telecommun., Beijing, China
Volume :
51
Issue :
5
fYear :
2015
fDate :
3 5 2015
Firstpage :
421
Lastpage :
423
Abstract :
In massive multiple-input-multiple-output (MIMO) systems, the downlink zero-forcing (ZF) precoding method needs to compute the pseudoinverse of large matrices, which introduces high computational complexity, especially when the number of antennas is large or infinite. Although, based on Neumann series expansion, several approximation algorithms could reduce the complexity, calculating the optimisation coefficients would cost large amounts of resources and produce large delay. A novel method, also based on Neumann series expansion, is proposed. In this method, the multiplication of full matrices is transformed into multiplication of diagonal matrices by hollow matrices, effectively reducing computational complexity. Meanwhile, consideration of a simple expression of optimisation coefficients so as to avoid large delay is very useful in high-mobility scenarios. Analysis and simulation results show the effectiveness of the proposed method.
Keywords :
MIMO communication; approximation theory; communication complexity; matrix inversion; matrix multiplication; optimisation; precoding; series (mathematics); Neumann series expansion; antennas; approximation algorithms; computational complexity; diagonal matrices; downlink ZF precoding method; hollow matrices; massive MIMO system; matrices multiplication; matrix pseudoinverse computation; multiple input multiple output; optimisation coefficients; zero forcing;
fLanguage :
English
Journal_Title :
Electronics Letters
Publisher :
iet
ISSN :
0013-5194
Type :
jour
DOI :
10.1049/el.2014.3602
Filename :
7047398
Link To Document :
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