Convex Optimization
Wireless Communications
NeXt generation/dynamic spectrum access/cognitive radio wireless networks: a survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
Rate-maximization scheduling schemes for uplink OFDMA
IEEE Transactions on Wireless Communications
A cooperative multicast scheduling scheme for multimedia services in IEEE 802.16 networks
IEEE Transactions on Wireless Communications
Efficient resource allocation for OFDMA multicast systems with fairness consideration
RWS'09 Proceedings of the 4th international conference on Radio and wireless symposium
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In this paper, we study the weighted sum rate (WSR) maximization methods for the multicast service in the downlink orthogonal frequency division multiple access (OFDMA) system. Based on Lagrange dual composition, we design several WSR maximization algorithms under both sum transmit power and per-subchannel transmit power constraints. Compared to available results for multicast resource allocation which were suboptimal or involved a large complexity, our methods are asymptotically optimal, stable, and have a low complexity. Three algorithms are developed, a duality method with only sum transmit power constraint, and two duality methods considering both sum transmit power and per-subchannel transmit power constraints. Simulation results show that the proposed method converges very fast and always meets the power constraint strictly. Furthermore, in the case of the per-subchannel transmit power constraint, the improved duality scheme can bring significant performance gain than the conventional duality scheme.