Optimal selective feedback policies for opportunistic beamforming

T Samarasinghe; H Inaltekin; JS Evans

Journal article

Optimal selective feedback policies for opportunistic beamforming

T Samarasinghe, H Inaltekin, JS Evans

IEEE Transactions on Information Theory | Published : 2013

DOI: 10.1109/TIT.2013.2239355

Abstract

This paper studies the structure of downlink sum-rate maximizing selective decentralized feedback policies for opportunistic beamforming under finite feedback constraints on the average number of mobile users feeding back. First, it is shown that any sum-rate maximizing selective decentralized feedback policy must be a threshold feedback policy. This result holds for all fading channel models with continuous distribution functions. Second, the resulting optimum threshold selection problem is analyzed in detail. This is a nonconvex optimization problem over finite-dimensional Euclidean spaces. By utilizing the theory of majorization, an underlying Schur-concave structure in the sum-rate funct..

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University of Melbourne Researchers

Jamie Evans Author

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Awarded by Seventh Framework Programme

Funding Acknowledgements

This work was supported in part by the European Union Research Executive Agency Marie Curie FP7-Reintegration-Grants under Grant PCIG10-GA-2011-303713, in part by the Scientific and Technological Research Council of Turkey under Grant 112E024, and in part by the Australian Research Council under Grant DP-09-84862 and Grant DP-11-0102729. This paper was presented in part at the International Symposium of Modeling and Optimization in Mobile Ad Hoc and Wireless Networks, Princeton, NJ, May 2011, and in part at the 2011 IEEE International Symposium on Information Theory.