On the optimality of beamforming for multi-user MISO interference channels with single-user detection

Authors:
Xiaohu Shang;Biao Chen;H. Vincent Poor
Affiliations:
Department of Electrical Engineering, Princeton University;Department of Electrical Engineering, Syracuse University;Department of Electrical Engineering, Princeton University
Venue:
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Year:
2009

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Abstract

For a multi-user interference channel with multi-antenna transmitters and single-antenna receivers, by restricting each receiver to a single-user detector, computing the largest achievable rate region amounts to solving a family of nonconvex optimization problems. Recognizing the intrinsic connection between the signal power at the intended receiver and the interference power at the unintended receiver, the original family of non-convex optimization problems is converted into a new family of convex optimization problems. It is shown that, for such interference channels with each receiver implementing single-user detection, transmitter beamforming can achieve all boundary points of the achievable rate region.