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近年来正交频分多址接入(OFDMA,Orthogonal Frequency Division Multiplexing Access)技术在无线通信中的应用越来越广泛。针对OFDMA系统中的资源调度问题,介绍和分析了OFDMA系统中常见的分组调度算法-轮询算法、最大载干比算法和比例公平算法,并且提出了一种结合了遗传搜索的自适应调度算法。最后在此基础上对这四种分组调度算法进行了仿真和分析,仿真结果表明,不管是系统吞吐量还是公平性,自适应调度算法都有较好的性能提升。
In recent years, Orthogonal Frequency Division Multiple Access (OFDMA) technology has become more and more widely used in wireless communications. Aiming at the problem of resource scheduling in OFDMA system, this paper introduces and analyzes the common packet scheduling algorithms in OFDMA system - polling algorithm, maximum load-to-interference ratio algorithm and proportional fairness algorithm, and proposes an adaptive scheduling algorithm combined with genetic search . Finally, the four packet scheduling algorithms are simulated and analyzed. The simulation results show that the adaptive scheduling algorithm has better performance improvement both in system throughput and fairness.