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Optimal Distributed Beamforming for TwoUser MISO Interference Channel Based on a GameTheoretic Viewpoint
Jiamin LI Dongming WANG Pengcheng ZHU Lan TANG Xiaohu YOU
Publication
IEICE TRANSACTIONS on Communications
Vol.E95B
No.10
pp.33453348 Publication Date: 2012/10/01 Online ISSN: 17451345
DOI: 10.1587/transcom.E95.B.3345 Print ISSN: 09168516 Type of Manuscript: LETTER Category: Wireless Communication Technologies Keyword: cooperative multicell beamforming, interference channel, Pareto optimal, gametheoretic viewpoint,
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Summary:
All points on the Pareto boundary can be obtained by solving the weighted sum rate maximization problem for some weighted coefficients. Unfortunately, the problem is nonconvex and difficult to solve without performing an exhaustive search. In this paper, we propose an optimal distributed beamforming strategy for the twouser multipleinput singleoutput (MISO) interference channel (IC). Through minimizing the interference signal power leaked to the other receiver for fixed useful signal power received at the intended receiver, the original nonconvex optimization problem can be converted into a family of convex optimization problems, each which can be solved in distributed manner with only local channel state information at each transmitter. After some conversion, we derive the closedform solutions to all Pareto optimal points based on a gametheoretic viewpoint which indicates that linear combinations of the maximumratio transmit (MRT) and zeroforcing (ZF) beamforming strategies can achieve any point on the Pareto boundary of the rate region for the twouser MISO interference channel, and the only computation involved is to solve a basic quadratic equation. Finally, the result is validated via numerical simulations.

