基于SLNR准则的MU-MIMO下行链路的预编码与用户调度

在多用户MIMO（MU-MIMO）系统的下行链路中,为了降低用户端的处理复杂度,发射端预编码的设计对多用户MIMO系统的性能非常重要,基于信漏噪比（SLNR）准则的预编码技术由于同时考虑了共信道干扰（CCI）和噪声,提高了系统的性能,但基站同时服务的用户有限,基于信漏噪比最大的用户调度能够合理地选择用户,提高了多用户分级增益,使系统获得更高的系统容量和系统性能。仿真结果表明,基于SLNR准则的多用户预编码在系统容量和误码率方面要优于单一考虑CCI的迫零预编码（ZF）和单一考虑噪声的最大化每个用户接收到信号的信噪比预编码（MRT）。在采用SLNR预编码的条件下,信漏噪比最大的用户调度系统性比轮询调度和最大信道增益调度好,并且随着待选用户数的增多,不会给系统的调度策略带来很大的影响。

Precoding and user scheduling based on SLNR criteria for MU-MIMO downlink

In multi-user MIMO(MU-MIMO) downlink system,in order to reduce the complexity of the client processing,transmitter precoding design for multi-user MIMO system performance is very important.Precoding based on signal leakage noise ratio(SLNR) eliminates the co-channel interference(CCI) and noise to improve the system performance.Since the users that the base station server at the same time are limited,user scheduling based on maximum signal to noise ratio of the leakage can be a reasonable choice to improve the diversity gain,obtain higher system capacity and better system performance.Simulation results prove that the SLNR precoding is superior to the zero-forcing(ZF) precoding and maximizing each user′s receiving signal to noise ratio(MRT) precoding.What′s more,using SLNR precoding and maximum signal leakage noise ratio scheduling are much better than the round-robin scheduling and the maximum channel gain scheduling.With the increase of users to be selected,it has little effect on the system scheduling strategy.