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现有基于中继协作的正交频分多址接入(orthogo-nal frequency division multiple access,OFDMA)系统的无线资源分配算法主要面向单一业务和用户需求。该文研究了基于服务质量(quality of service,QoS)保证和异质业务的协作OFDMA系统无线资源分配问题,建立了以最大化系统效用函数为目标的模型,联合了功率控制、载波分配和中继选择。对于具有指数阶复杂度的原混合整数规划问题,通过引入QoS价格因子,将其转化为一个凸优化问题,并且提出了一个基于双层对偶分解的资源分配算法。仿真结果表明:该方法能显著提高系统对异质业务的支持能力,并保证用户之间的公平性。
The existing radio resource allocation algorithms of the orthogo-nal frequency division multiple access (OFDMA) system based on relay cooperation mainly aim at single service and user requirements. This paper studies the problem of wireless resource allocation in OFDMA system based on quality of service (QoS) guarantee and heterogeneous services. A model is set up to maximize the system utility function, which combines power control, carrier allocation and medium Following the choice. For the original mixed integer programming problem with exponential order complexity, the QoS price factor is introduced to convert it into a convex optimization problem, and a resource allocation algorithm based on dual-layer dual decomposition is proposed. Simulation results show that this method can significantly improve the system’s ability to support heterogeneous services and ensure fairness among users.