下行4×2LTE系统中混合MIMO传输模式的均衡器设计及其系统性能仿真

Equalizers Design and Performance Simulation for Hybrid MIMO Transmission Schemes in Downlink 4×2 LTE Systems

为了能给实际下行LTE系统接收器设计提供有效的先验信息,考虑下行4×2高阶MIMO天线配置,首先给出了LTE系统下行混合M IMO传输模式的接收信号模型,并且根据MMSE准则和MRC准则分别设计出不同均衡器来抑制这种混合干扰;同时为了提高系统仿真效率,推导出了基于信道响应矩阵随机扰动的信干噪比修正公式。最后通过仿真给出混合MIMO传输模式下,不同模式目标用户的吞吐量变化曲线,结果表明,MMSE均衡器相比MRC均衡器有更大的性能增益,对实际LTE系统的性能分析有较高的参考价值。

In order to supply the downlink receiver design of practical LTE system with effective prior information,downlink 4×2 high order MIMO antennas configuration was considered.Firstly,the received signal model of downlink hybrid MIMO transmission schemes was presented in LTE systems,and then Minimum Mean Square Error（MMSE） equalizer and Maximal Ratio Combination（MRC） equalizer were designed to suppress the hybrid interferences,respectively.Furthermore,for improving system simulation efficiency,a modified formula of Signal to Interference plus Noise Ratio（SINR） based on modifying factor was deduced from the random perturbation assumption of channel response matrix.Finally,the hybrid MIMO transmission schemes were considered in downlink LTE system simulations,and throughput curves of target user with different scheme were drawn.The results showed that MMSE equalizer performs better than MRC equalizer,and has important reference value for analyzing actual LTE system performance.