Opportunistic Feedback for Downlink Multiuser Diversity


Taiwen Tang, and Robert W. Heath, Jr.


IEEE Communications Letters, vol. 9, no. 10, pp. 948-950, October 2005.


This paper proposes a random access based feedback protocol for achieving multiuser diversity with a fixed number of feedback slots. Active users send a feedback message with some probability if their channel power is above a threshold. The threshold and random access probability are jointly designed to maximize the average sum rate of all users.


Feedback, multiuser channels, diversity methods, protocols, opportunistic. 

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