基于有限反馈的多用户MIMO系统下行调度算法研究

Research on Downlink Scheduling in MU-MIMO Systems Based on Limited Feedback

基于预编码技术的调度方案可以提高频谱效率和系统公平性,但较少考虑QoS需求的满足。提出了一种适用于有限反馈多用户MIMO系统的下行调度算法。根据预编码矩阵选择数据流,以最大化系统容量并降低同信道干扰。先后为主数据流和次数据流执行多用户调度,有效扩大了空间复用增益。仿真结果表明,该算法可以获得更高的频谱效率,并保证业务的QoS需求。

Significant spetrum efficiency and system fairness can be obtained by employing scheduling schemes based on precoding techniques. However, QoS guarantee requirements are seldom taken into account. A downlink scheduling algorithm was proposed for multiple user multiple-input multiple-output （MU-MIMO） systems with limited feedback. To maximize the overall capacity and reduce co-channel interference （CCI）, streams were selected in accordance with precoding matrices. Multi-user packet scheduling was carried out for both primary streams and secondary streams, thus effectively exploiting spatial multiplexing gains. Numerical results show that, the algorithm can achieve higher spectrum efficiency, while guaranteeing QoS requirements of services.