隧道内纳秒级多径信号分集接收方法探索及其仿真实验  

Method Research and Simulation Experiment on Diversity Reception of Nanosecond Multipath Signal in Tunnels

作　　者：张晓光[1] 王艳芬[1] 孙彦景[1] 王刚 

机构地区：[1]中国矿业大学信息与控制工程学院,江苏徐州221116

出　　处：《实验室研究与探索》2017年第8期55-59,共5页Research and Exploration In Laboratory

基　　金：教育部第六批国家特色专业建设项目(TS1Z293);全国工程专业学位研究生教育教改项目(2016-ZX-224);江苏省高等教育教改项目(2015JSJG275);中国矿业大学名师培育项目;中国矿业大学教改项目(2016YB16)

摘　　要：结合我校研究生所开设的现代通信系统课程,设计了隧道内无线通信系统实验的一个拓展内容——隧道内小时延多径信号分集接收方法探索及其仿真实验。由于纳秒级多径信号密集,致使隧道内无线通信质量急剧下降,通信距离严重受限。为了达到隧道内可靠通信距离增加的目的,本实验针对隧道内复杂环境,如背景噪声大、纳秒级多径密集的特点,提出了CFOC-MN纳秒级时延估计算法,并用其改进传统瑞克分集接收机,使其能够变密集的、且时延扩展为纳秒级的隧道内多径为有利信号。实验结果表明:提出的CFOC-MN纳秒级时延估计算法改进瑞克分集接收机,有效提高了接收信号的信噪比,能够达到延长可靠通信距离的效果。Combined with school ＇s graduate course of modern communications systems,an expanding content of reception technology of small delay multipath signal is designed. In underground tunnel environment,small delay multipath signals are dense,therefore multi-path fading in a mine tunnel is more severe than that in open environment.It leads to sharp declines in quality of wireless communication and a unwanted limited in communication distance. In order to inhibit multi-path fading in tunnels,the diversity reception technology of small delay multi-path signal was discussed. This paper proposed the CFOC-MN delay estimation algorithm for heavy background noise to improve the traditional RAKE receiver,which transformed the dense multi-path signal. The delay spread was at ns level. Simulation results show that the performance of RAKE diversity receiver can effectively improve the SNR of received signal,and can achieve the effect of extending the reliable communication distance.

关 键 词：隧道 纳秒级多径信号 瑞克分集接收 CFOC-MN算法 仿真实验 

分 类 号：TD655[矿业工程—矿山机电] TN92[电子电信—通信与信息系统]