Reduced feedback and signaling schemes for sum-rate maximization in OFDMA systems

Authors:
Naveen Arulselvan;Suresh Kalyanasundaram
Affiliations:
Network Advanced Technologies, Motorola, Bangalore, India;Network Advanced Technologies, Motorola, Bangalore, India
Venue:
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Year:
2009

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Abstract

We study several channel quality reporting strategies for OFDMA systems that maximize the sum-rate while constrained by feedback and signaling overhead. These reporting schemes are based on the grouping idea, which essentially limits the number of users accessing a sub-channel or physical resource block. This in turn reduces the overhead needed to convey Channel Quality Indication (CQI). On the other hand, grouping user and/or sub-channels reduces the multi-user diversity. We investigate this trade-off for various grouping schemes. Numerical experiments show that even for reasonably high overheads, the grouping schemes achieve a substantial gain in sum-rate as compared to reporting on all sub-channels. Reporting fine-granular channel quality information on the user's best sub-channels, is found to be the optimal strategy.