To utilize the multiuser diversity efficiently in multiuser MIMO systems,opportunistic scheduling is employed,where the user with largest SNR is adaptively selected according to channel state information feedback from the receive side and in the meantime,and to utilize the multiplexing gain effectively and improve the capacity,a novel scheme of MIMO systems combining opportunistic scheduling and spatial multiplexing with zero-forcing receiver is presented under Rayleigh channel.Using the direct method based on polynomial expansion,the expressions of error rate with M-QAM and M-PSK modulations,the diversity gain and the sum-rate capacity under different channel conditions are got,respectively,and the asymptotic forms are derived based on Taylor series.The correctness of theoretical analysis is verified by the corresponding Monta-Carlo simulation results which indicate that the scheme with multiuser diversity provides much larger diversity and higher capacity than that without opportunistic scheduling.%为了充分利用多用户MIMO系统中固有的多用户分集,采用机会调度方案,根据接收端反馈的信道状态信息选择有着最大信噪比的用户进行数据传输,同时为了有效地利用复用增益,提高系统的容量,在平坦瑞利信道中,提出并分析了结合机会调度和空间复用的采用迫零接收机的MIMO系统方案.在不同信道估计下,根据基于多项式展开的方法,分别推导出了采用M-QAM和M-PSK调制的系统的误码率、分集增益量化值以及总速率容量,并用基于泰勒级数的方法对其进行渐近分析.通过蒙塔卡罗仿真很好地验证了理论分析的正确性,表明该方案相对于没有机会调度的系统提供了更大的分集和更高的容量.
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