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A Study on Optimal Beam Patterns for Single User Massive MIMO Transmissions
Maki ARAI Kei SAKAGUCHI Kiyomichi ARAKI
Publication
IEICE TRANSACTIONS on Communications
Vol.E102B
No.2
pp.324336 Publication Date: 2019/02/01 Publicized: 2018/07/30 Online ISSN: 17451345
DOI: 10.1587/transcom.2018EBP3030 Type of Manuscript: PAPER Category: Antennas and Propagation Keyword: massive MIMO, beamforming, beam pattern, directivity, spherical mode expansion, capacity maximization,
Full Text: FreePDF(2.7MB)
Summary:
This paper proposes optimal beam patterns of analog beamforming for SU (Single User) massive MIMO (MultiInput MultiOutput) transmission systems. For hybrid beamforming in SU massive MIMO systems, there are several design parameters such as beam patterns, the number of beams (streams), the shape of array antennas, and so on. In conventional hybrid beamforming, rectangular patch array antennas implemented on a planar surface with linear phase shift beam patterns have been used widely. However, it remains unclear whether existing configurations are optimal or not. Therefore, we propose a method using OBPB (Optimal Beam Projection Beamforming) for designing configuration parameters of the hybrid beamforming. By using the method, the optimal beam patterns are derived first, and are projected on the assumed surface to calculate the achievable number of streams and the resulting channel capacity. The results indicate OBPB with a spherical surface yields at least 3.5 times higher channel capacity than conventional configurations.

