Title :
Opportunistic feedback for downlink multiuser diversity
Author :
Tang, Taiwen ; Heath, Robert W., Jr.
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA
Abstract :
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.
Keywords :
access protocols; diversity reception; multiuser channels; probability; channel power; downlink multiuser diversity; feedback message; maximization; multiuser channel; probability; random access protocol; Access protocols; Centralized control; Diversity methods; Downlink; Feedback; Gaussian noise; Multiuser channels; Performance gain; Quantization; Throughput;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2005.10002
