FDD-LTE系统中下行链路MIMO传输模式的研究与仿真

摘要

LTE is the main technology of current 4G mobile communication network,which is categorised as TD-LTE model and FDD -LTE model. FDD -LTE mainly uses key technologies such as OFDM orthogonal frequency division multiplexing technology and MIMO technology by which the spectral efficiency is enchanced and data transmission rate is improved greatly. The downlink MIMO mode in LTE communication system has been studied in the paper. Meanwhile,three mathematical model of transmission mode about the single antenna port 0 mode,beamforming mode and spatial diversity mathematical mode have been explored. On this basis,the corresponding simulation model is established. Finally,the SNR result of different modes adopted corresponding simulation model based on MATLAB platform is discussed and compared. The respective advantages and disadvantages of three modes is analyzed according to the simulation result of three transmission modes and specific application scenarios given.%LTE是当前4G移动通信网络的主流技术，它分为TD-LTE和FDD-LTE两种工作模式，其中FDD-LTE主要采用了OFDM正交频分复用和MIMO等关键技术，显著提升了频谱效率，提高了数据传输速率。本文对FDD-LTE无线通信系统中MIMO下行传输模式进行研究，对其中的单天线端口0模式、波束赋形模式以及空间分集三种传输模式的数学模型进行了探讨，并在此基础上建立与之对应的仿真模型。最后在MATLAB平台下通过对系统仿真模型所得到的不同模式下的信噪比结果进行讨论与比较，通过仿真结果分析三种传输模式各自优缺点，并给出各自适用的具体应用场景。