LTE下行链路中的MIMO技术分析

Analysis of MIMO technology in LTE downlink

以LTE下行链路为背景,文中对LTE系统的MIMO(Multiple Input Multiple output)技术展开仿真研究。首先研究了无线信道,分别对低速率和高速率平坦衰落信道及选择性衰落信道四种小尺度衰落信道进行了仿真研究。在上述信道环境下,对LTE的四种传输模式进行了仿真,比较了各模式下的误码率性能及适用环境,分析了LTE下行链路中发射分集和空分复用的作用,并对闭环反馈的三种信道估计方法的优劣进行了仿真比较。

With the background of LTE downlink,the paper simulates the MIMO （ Multiple Input Multiple output）technology in LTE system. First,It researches on wireless channel,simulates four kinds of small-scale fading models,which are low-speed flat fading channel,high-speed flat fading channel, low-speed frequency-selective fading channel and high-speed frequency-selective fading channel. In the above channel environment,it simulates four transmission modes of LTE,then compares the bit error rate performance and application environment of each model,and analyzes the function of transmit diversity and spatial multiplexing in downlink LTE, last,it simulates and compares the advantages and disadvantages of three channel estimation methods for closed-loop feedback.