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WLC27-3: An Efficient Resource Allocation Algorithm for OFDMA Systems with Multiple Services

The adaptive subcarrier and bit allocation in OFDMA systems supporting multiple services is investigated. A suboptimal algorithm is developed, which aims to maximize the system throughput under the overall transmit power constraint while guaranteeing the QoS requirement of realtime users and supporting proportional fairness among non-realtime users. Firstly, the algorithm allocates subcarriers and power to realtime users so that the required power for them is minimized and the average power per subcarrier of realtime users is approximately equal to that of non-realtime users. Then, the remaining subcarriers and power are allocated to non- realtime users by a proposed rate adaptive resource allocation algorithm, which achieves a suboptimal overall throughput while providing proportional fairness among users. Simulation results show that the proposed algorithm achieves better performances than existing algorithms.