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针对基于有限反馈ZF预编码的MIMO多用户下行系统,提出了一种用户较少情况下的低复杂度调度算法.本算法以系统吞吐量的下限为目标函数,通过吞吐量下限最大化的办法选择用户,使系统获得多用户分集增益,从而增加了系统吞吐量.同时为了解决总反馈量随用户数线性增加的问题,提出了基于门限反馈的办法降低总的反馈速率.仿真结果表明:本算法能够有效地增加系统的吞吐量,选择适当的门限反馈在降低总的反馈速率的同时并未影响系统的性能.
Aiming at MIMO multi-user downlink system based on limited feedback ZF precoding, a low complexity scheduling algorithm with fewer users is proposed in this paper.The lower bound of system throughput is taken as the objective function and the throughput limit is maximized Select the user to make the system obtain multi-user diversity gain, thus increasing the system throughput.At the same time, in order to solve the problem that the total feedback amount increases linearly with the number of users, a threshold feedback method is proposed to reduce the total feedback rate.The simulation results show that The algorithm can effectively increase the throughput of the system. Choosing the appropriate threshold feedback can reduce the total feedback rate without affecting the performance of the system.