Feedback reduction scheme for downlink multiuser diversit

Authors:
Jaewoo So;John M. Cioffi
Affiliations:
Department of Electronic Engineering, Sogang University, Seoul, Republic of Korea;Department of Electrical Engineering, Stanford University, Stanford, CA
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

Citing 5
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Mode selection-based channel feedback reduction schemes for opportunistic scheduling in OFDMA systems

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Abstract

A group random access-based feedback scheme is proposed for multiuser diversity systems, where users are divided into several feedback groups according to their measured channel states. Different random access probabilities and number of feedback minislots are assigned to each feedback group. Each user competes to send a feedback message through random access if its scheduling metric exceeds a threshold. The base station jointly controls the random access probabilities, the thresholds, and the number of feedback minislots to adjust the feedback load. The proposed feedback scheme shows a good system capacity with limited feedback resources regardless of the number of users.