Geng, Jian, Wei, Zaixue, Wang, Xianling, Xiang, Wei, and Yang, Dacheng (2013) Multiuser hybrid analog/digital beamforming for relatively large-scale antenna arrays. In: Proceedings of the IEEE Global Communications Conference. pp. 123-128. From: GLOBECOM 2013: IEEE Global Communications Workshops, 9-13 December 2013, Atlanta, GA, USA.

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Abstract

Power consumption and costs of the analog 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 is less than the number of the antennas. Beamforming for this low-complexity hardware architecture involves both digital and analog beamforming, which is termed hybrid analog/digital beamforming. This paper focuses on the optimization for hybrid analog/digital beamforming to minimize the transmit power subject to the signal-to- interference-plus-noise-ratio (SINR) constraints. Properties on the feasibility and optimum of the considered problem are derived. Numerical algorithm based on semi-definite positive (SDP) relaxation is proposed in an attempt to solve the optimization problem. Numerical simulations show that the performance of hybrid analog/digital beamforming is highly related to the correlation of the channel coefficients of different subcarriers.

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