基于射线跟踪法的隧道无线信道特性  

Radio channel character in tunnels based on theray-tracing method

作　　者：陶成[1] 由明昕 谈振辉[1] 刘留[1] 蓝燕锐 孙栋 

机构地区：[1]北京交通大学电子信息工程学院,北京100044 [2]中天科技集团有限公司,江苏南通226009

出　　处：《北京交通大学学报》2016年第2期1-7,共7页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家自然科学基金资助项目(61132003);北京市自然科学基金资助项目(4142041)

摘　　要：城市地下轨道交通的隧道环境与地上环境的移动通信有显著不同,为发展应用于隧道环境中的无线通信系统,需要对隧道中的无线信道特性进行研究.本文使用射线跟踪法对隧道环境无线信道进行仿真,并将仿真结果与实际测量结果进行对比,对比结果表明:基于射线跟踪法的信道模型,能够较准确地预测隧道中的大尺度衰落和信道冲激响应等信道特性.在此基础上,又对隧道中的MIMO(多输入多输出天线)系统信道特性进行仿真,仿真结果得出结论:隧道环境中MIMO空间相关度在天线阵列方向上显示出波动性,波动周期与传播信号的波长成正比.The investigation of radio characteristics in tunnels is the foundation of developing the wireless communication system in tunnels. In this paper, the ray-tracing method is used to simu- late the radio channel in tunnels. The simulation results compared against measurements. The comparison results show that the channel model based on ray-tracing method is accurate enough to predict the channel characteristics such as the large scale fading and channel impulse response. The MIMO channel characteristics in tunnels simulated in the next section, the results show that the spacing correlation of MIMO channel is fluctuant. The period of fluctuation is proportional to the wavelength of the transmitted signal.

关 键 词：无线信道仿真 隧道环境 射线跟踪 相关系数 

分 类 号：TN929.5[电子电信—通信与信息系统]