摘要
隧道中无线电波多径传播非常严重,通信质量急剧下降。多径传播特性的研究对隧道内无线通信系统的设计具有重要的意义。通过分析和研究隧道中多径传播的衰减和时延特性,建立了多径信道的衰减和时延模型,给出了单频信号、窄带信号和宽带信号多径衰落的统计特性,并对多径信号的合成进行了仿真,为抗衰落技术的应用打下了基础。
The multipath propagation of electromagnetic wave is severe in tunnel,so the quality of mobile communication in it drops sharply.The study of the multipath propagation characteristics is very important to the design of wireless communication system in tunnel.After analyzing the multipath propagation attenuation and time delay characteristics in tunnel,a multipath channel attenuation and time delay model is built,the statistical characteristics of multipath decline of single frequency signal,narrowband signal and broadband signal are deduced.Finally,multipath propagation simulating waves are got.This is a foundation for the application of resisting multipath decline techniques.
出处
《电子测量与仪器学报》
CSCD
2008年第S2期273-278,共6页
Journal of Electronic Measurement and Instrumentation
基金
国家自然科学基金(60704036)
北京工业大学青年基金(97002011200701)
北京工业大学博士科研启动基金(52002011200707)
关键词
多径传播
仿真
衰减模型
时延模型
multipath propagation
simulating
attenuation model
time delay model
