Computationally efficient bandwidth allocation and power control for OFDMA
IEEE Transactions on Wireless Communications
Downlink resource management for packet transmission in OFDM wireless communication systems
IEEE Transactions on Wireless Communications
QoS-aware Selective Feedback and Optimal Channel Allocation in Multiple Shared Channel Environments
IEEE Transactions on Wireless Communications
Utility-based resource allocation and scheduling in OFDM-based wireless broadband networks
IEEE Communications Magazine
Multiuser OFDM with adaptive subcarrier, bit, and power allocation
IEEE Journal on Selected Areas in Communications
Opportunistic transmission scheduling with resource-sharing constraints in wireless networks
IEEE Journal on Selected Areas in Communications
Cross-layer QoS Analysis of Opportunistic OFDM-TDMA and OFDMA Networks
IEEE Journal on Selected Areas in Communications
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This paper deals with the problem of finding an optimal subcarrier allocation strategy for uplink and downlink communications in an OFDMA metropolitan wireless system. Three different resource allocation algorithms are proposed by taking into account the Quality of Service (QoS) constraints and the user's channel conditions. Moreover, a simple strategy for choosing the most appropriate Modulation and Coding Scheme (MCS) according to the channel conditions of the assigned subcarriers is also considered. Finally, this paper studies the possibility of applying an adaptive Time Division Duplexing (TDD) separation of the uplink and downlink frame, based on the instantaneous load of the network. The performance of the proposed algorithms have been derived and compared in terms of error rate and throughput. All proposed methods show a significant improvement of the overall system performance in comparison with the static subcarrier allocation in which channel information has not taken into account. Moreover, additional improvements have been obtained by applying to these schemes the proposed adaptive TDD frame separation strategy.