Massive MIMO Antenna Arrangement Considering Spatial Efficiency and Correlation between Antennas in Mobile Communications

Kiyoaki ITOI  Masanao SASAKI  Hiroaki NAKABAYASHI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E103-B   No.5   pp.570-581
Publication Date: 2020/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2019EBP3011
Type of Manuscript: PAPER
Category: Antennas and Propagation
Keyword: 
massive MIMO,  mathematical optimization,  channel response,  correlation coefficient,  ray-tracing,  

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Summary: 
This paper presents an algorithm to arrange a large number of antenna elements in the limited space of massive MIMO base station antenna without degrading the communication quality under a street-cell line-of-sight environment in mobile communications. The proposed algorithm works by using mathematical optimization in which the objective function is the correlation coefficient between the channel responses of two elements of the base station antenna, according to an algorithm constructed based on the results obtained through basic examinations of the characteristics of the correlation coefficient between channel responses. The channel responses are computed by using the propagation path information obtained by ray-tracing. The arrangements output by the proposed algorithm are mainly evaluated by channel capacity comparison with uniformly spaced arrangements on the vertical plane in single user and multiuser environments. The evaluation results of these arrangements in downlink demonstrate the superiority of the arrangements generated by the proposed algorithm, especially in term of robustness against an increase in the number of users.