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Efficient Adaptive Modulation Technique for Multiuser OFDMA Systems  

Kwon, Jung-Hyoung (연세대학교 전기전자공학과)
Rhee, Do-Ho (연세대학교 전기전자공학과)
Byun, Il-Mu (연세대학교 전기전자공학과)
Whang, Keum-Chan (연세대학교 전기전자공학과)
Kim, Kwang-Soon (연세대학교 전기전자공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.12C, 2006 , pp. 1240-1248 More about this Journal
Abstract
In this paper, we present a new method for user selection, sub-band allocation, and power allocation in order to maximize the system throughput under the constraint of transmit power in multiuser downlink orthogonal frequency division multiple access (OFDMA) systems with partial channel quality information (CQI). In previous schemes, each user in one cell transmits CQI of all sub-bands to the base station, which requires enormous feedback overhead. Therefore, we proposed an efficient power allocation and modulation and coding selection scheme in which each user transmits partial CQI and one additional information to reduce the amount of feedback. Simulation results show that we can greatly reduce the amount of feedback than full feedback system.
Keywords
Multiuser downlink OFDMA; Sub-band allocation; Partial channel quality information (CQI); Reduced feedback information;
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