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A Study on Optimal Beam Patterns for Single User Massive MIMO Transmissions
This paper proposes optimal beam patterns of analog beamforming for SU
(Single User) massive MIMO (Multi-Input Multi-Output) 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.Comment: 22 pages, 29 figures, accepted, pape