在下行多用户多输入多输出(MU-MIMO)场景下,针对时分双工增强高速分组接入系统的调制编码方式(MCS)选择不准确的问题,提出了一种综合考虑多用户干扰和信道时变特性的调制编码方式选择算法.通过调度用户前次上行传输的信道估计,对用户反馈的信道质量指示(CQI)进行调整,再进行调制编码方式选择.该算法不需增加信令开销,基站运算复杂度低.仿真结果表明,在用户间干扰比较严重时,算法系统性能增益明显. Under MU-MIMO scenario, in view of the inaccurate modulation and coding scheme (MCS) selection of TD-SCDMA system, this paper proposes a multi-user multi-input and multi-output Time-varying modulation and coding scheme selection algorithm, which adjusts the CQI (channel quality indicator) fed back by the user by scheduling the channel estimation of the previous uplink transmission and then selects the modulation and coding scheme without increasing the signaling overhead, The computational complexity of the base station is low.The simulation results show that when the inter-user interference is serious, the performance gain of the algorithm system is obvious.