【摘要】 随着人们对城市轨道交通环境下通信业务需求的日益增加,隧道中无线移动通信系统的研究逐渐成为一个热点。由于隧道环境的独特性、列车的移动性以及乘客宽带接入的集中性,建立一个合理可靠的无线信道模型成为研究重点。基于隧道环境的封闭特性,引入列车移动速度和天线元素仰角等参数,建立一个三维大规模多输入多输出3D Massive MIMO(3Dimensional Massive Multiple Input Multiple Output)信道模型,分析该模型的信道统计特性,研究影响信道空时相关特性的因素集合,并与传统的二维2D信道模型进行比较。仿真结果表明,时延、归一化天线元素距离及接收端天线仰角对空时相关特性有较大影响,3D模型比2D模型具有更小的信道相关性。更多还原

【Abstract】 The research of wireless mobile communication system in tunnels has become a hot topic,with the increasing demand for communication services in urban rail transit environment.Due to the uniqueness of the tunnel environment,the mobility of trains and the concentration of passenger broadband access,the establishment of a reliable wireless channel model has become a research focus.Based on the closed characteristics of the tunnel environment,a three-dimensional massive multiple-input multiple-output(3D Massive MIMO)channel model was established by introducing the parameters of the train moving speed and the antenna elements elevation angle,to analyze the channel statistical characteristics of the model,and to study the factors influencing the channel space-time correlation.The channel model was compared with the traditional two-dimensional(2D)channel model.As the simulation results show,the time delay,the normalized antenna element distance and the receiver antenna elevation angle have a greater influence on the space-time correlation.The 3D model has a smaller channel correlation than the 2D model.更多还原