Journal article

The feedback-capacity tradeoff for opportunistic beamforming under optimal user selection

Tharaka Samarasinghe, Hazer Inaltekin, Jamie S Evans



Opportunistic beamforming is a reduced feedback communication strategy for vector broadcast channels which requires partial channel state information (CSI) at the base station for its operation. Although reducing feedback, this strategy in its plain implementations displays a linear growth in the feedback load with the total number of users in the system n, which is an onerous requirement for large systems. This paper focuses on a more stringent but realistic O(1) feedback constraint on the feedback load. Starting with a set of statistically identical users, we obtain the tradeoff curve tracing the Pareto optimal boundary between feasible and infeasible feedback-capacity pairs for opportunis..

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Awarded by Australian Research Council

Awarded by European Union Research Executive Agency Marie Curie FP7-Reintegration-Grants

Funding Acknowledgements

This research was supported in part by the Australian Research Council under Grants DP-09-84862 and DP-11-0102729, and in part by the European Union Research Executive Agency Marie Curie FP7-Reintegration-Grants under Grant PCIG10-GA-2011-303713. The material in this paper was presented in part at the international Symposium of Modeling and Optimization in Mobile Ad Hoc, and Wireless Networks, Princeton, USA, May 2011, and at the IEEE International Conference on Communications, Kyoto, Japan, June 2011.