Multi-user hybrid analogue/digital beamforming for relatively large-scale antenna systems

Geng, Jian, Xiang, Wei, Wei, Zaixue, Li, Nanxi, and Yang, Dacheng (2014) Multi-user hybrid analogue/digital beamforming for relatively large-scale antenna systems. IET Communications, 8 (17). pp. 3038-3049.

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Abstract

Power consumption and costs of analogue front-end (AFE) chains are often not negligible for large-scale antenna array systems. A low-complexity hardware architecture is to use a number of AFE chains that are less than the number of antennas. Beamforming for this low-complexity hardware architecture involves both digital and analogue beamforming, which is termed hybrid analogue/digital beamforming. In this study, minimising the transmit power subject to signal-to-interference-plus-noise ratio (SINR) constraints and maximising the minimal SINR under the constraint of the transmit power, are investigated, respectively, for hybrid analogue/digital beamforming. Properties on the feasibility and optimality of the two problems are derived. Numerical algorithms based on semi-definite positive relaxation are proposed in an attempt to solve the two optimisation problems. The performance of the proposed algorithms is evaluated under the Gaussian and 60 GHz channel models. It is shown that the performance of hybrid analogue/digital beamforming is highly related to the correlation of the channel coefficients of subcarriers. Additionally, for different extents of the users' spatial separability, some heuristics ways of designing analogue beamforming are shown to be able to approach to at least the local optimums under the 60 GHz channel model.

Item ID: 43295
Item Type: Article (Short Note)
ISSN: 1751-8636
Keywords: multi-access systems, array signal processing, antenna arrays, mathematical programming, Gaussian channels, multiuser hybrid analogue-digital beamforming, large-scale antenna array systems, analogue front-end, signal-to-interference-plus-noise ratio, SINR
Date Deposited: 24 Feb 2016 07:47
FoR Codes: 09 ENGINEERING > 0906 Electrical and Electronic Engineering > 090699 Electrical and Electronic Engineering not elsewhere classified @ 100%
SEO Codes: 89 INFORMATION AND COMMUNICATION SERVICES > 8901 Communication Networks and Services > 890199 Communication Networks and Services not elsewhere classified @ 100%
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