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资源分配是OFDMA系统资源调度中的一个重要研究问题。针对OFDMA下行链路信道知识获取的现实误差问题,提出了一种基于实际吞吐量优化的资源分配算法。重点研究了功率和数据率在用户之间的分配问题,以往的很多分配算法通常是假设下行链路发射端具有理想信道信息,这与实际状况不符,同时根据部分信道信息得到的速率分配不被真实的信道支持,会造成传输的中断事件。算法考虑了信道估计的误差问题,将实际吞吐量goodput作为分配算法优化的依据。仿真结果表明,该算法获得了较好的多用户分集增益和实际吞吐量性能。
Resource allocation is an important research issue in OFDMA system resource scheduling. Aiming at the practical error of OFDMA downlink channel knowledge acquisition, a resource allocation algorithm based on actual throughput optimization is proposed. Emphasis is placed on the distribution of power and data rate among users. Many of the past allocation algorithms usually assume that the downlink transmitter has ideal channel information, which is inconsistent with the actual situation. Meanwhile, the rate allocation based on the part of channel information is not True channel support can cause transmission interruption events. The algorithm considers the error of the channel estimation, and uses the goodput as the basis for the optimization of the allocation algorithm. Simulation results show that the proposed algorithm achieves better performance of multi-user diversity gain and real throughput.