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对于多用户多输入多输出系统,下行调度需要移动终端反馈大量的信道状态信息,随着用户数的增多,所需的反馈信息也剧增。由于信道状态信息与移动终端所处的位置相关,提出了基于“位置-信道状态信息数据库”的多用户调度算法,同时分析了该调度方法所需的反馈开销。理论和仿真结果表明:提出的调度方法无需反馈开销,且可以取得与基于无误差反馈的多用户调度方法相近的吞吐量性能。
For multi-user multiple-input-multiple-output system, the downlink scheduling needs a lot of channel state information feedback from the mobile terminal, and as the number of users increases, the required feedback information also increases sharply. Because the channel state information is related to the location of the mobile terminal, a multi-user scheduling algorithm based on “location-channel state information database ” is proposed, and the feedback overhead required by the scheduling method is analyzed. Theoretical and simulation results show that the proposed scheduling method does not require feedback overhead and can achieve similar throughput performance to multi-user scheduling based on error-free feedback.