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为进一步引入分集增益以提高无线资源频谱利用率,针对多用户多输入多输出-正交频分复用(MIMO-OFDM)系统下行传输,提出联合OFDM和多用户空间复用MIMO混合接入方式下的用户调度和功率分配算法。采用这种混合接入方式不仅能够通过频率信道和空间信道的调度产生多用户分集增益,而且能有效避免空分复用(SDMA)中频率复用产生的共信道干扰问题。在资源分配上,基于广义处理机共享(GPS)优化模型提出基于信道状态的并行加权公平队列(Cap-WFQ)调度和功率分配算法,算法在保证多媒体用户的最小数据率要求的同时优化系统的吞吐量。
In order to further introduce the diversity gain to improve the spectrum utilization efficiency of wireless resources, aiming at the downlink transmission of multi-user MIMO (Multiple Input Multiple Output) -Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system, a joint OFDM and multi-user spatial multiplexing MIMO hybrid access scheme Under the user scheduling and power allocation algorithm. The hybrid access method can not only generate multi-user diversity gain through scheduling of frequency channels and spatial channels, but also effectively avoid co-channel interference caused by frequency reuse in space division multiplexing (SDMA). Based on Generalized Processor Sharing (GPS) optimization model, this paper proposes a Cap-WFQ scheduling and power allocation algorithm based on channel state. The algorithm optimizes the performance of the system while ensuring the minimum data rate of multimedia users Throughput.