中文摘要：

研究多业务共存时OFDMA系统资源的自适应分配问题．系统优先为时间敏感业务分配资源以保证其对时延的要求，为其分配子载波簇以降低所需反馈信息量，通过增加子载波簇上的功率来降低其占用的频带．其次，将剩余资源灵活地分配给数据业务，着重考虑整比特分配后的剩余功率重分配以进一步提高系统吞吐量．仿真结果表明，在大信噪比时，经剩余功率重分配后频谱利用率可提高约50％，而时间敏感用户的掉线率几乎为0．

英文摘要：

Allocation of OFDMA radio resources to multiple services with different QoS requirements is considered in this paper. First, time sensitive services receive high priority to get necessary resources to meet their time delay requirements, and obtain subcarrier clusters to lower the feedbacks and a little more power on each subcarrier cluster to reduce occupancy of the bandwidth. Secondly, the remaining resources after the first step are adaptively assigned to date services to realize the subcarrier-power-integer bits allocation to maximize throughput of OFDMA systems, with the help of remaining power reallocation. Simulations indicate that, using the proposed scheme, spectrum efficiency can be improved by 50% and drop-rate for the time-insensitive users is almost zero with large SNR.