Adaptive radio resource allocation for downlink OFDMA/SDMA systems with multimedia traffic
IEEE Transactions on Wireless Communications - Part 1
Transmit power adaptation for multiuser OFDM systems
IEEE Journal on Selected Areas in Communications
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In orthogonal frequency division multiple access (OFDMA)-based systems, base station (BS) can adaptively adjust modulation and coding parameters according to channel quality indicator (CQI) fed back, therefore spectrum efficiency can be significantly improved. In this paper, based on the joint consideration of both quality of service (QoS) difference and spectrum efficiency, we have proposed a novel resource allocation algorithm and a modified top- M feedback scheme for OFDMA-based systems with limited CQI feedback. In order to meet the QoS requirements, users of different traffic types are assigned with different priorities. Simulation results have proved that the proposed allocation algorithm can fully sustain user's requirements under reasonable traffic loads, and simultaneously the feedback load can be greatly reduced.