U型槽无线信道多径传播特性测量与建模方法的研究

Research on Measurement and Modeling of Wireless Channel Multipath Propagation Properties for U-Shape Cutting

作为建立和优化数字通信系统的基础工作之一,信道测量与建模一直是人们关注和研究的焦点。本文总结了常用的信道探测方法和多径提取方法,分析了TDL和CDL 2种建模方法的原理:同时以高铁U型槽实际信道测量数据为例,从时延特性和频域相关性2个方面对信道频率选择性衰落特性进行分析,归纳了两者之间的关系;针对宽带测量的簇模型,研究了常见的簇模型参数;针对特殊场景(如高速条件)下的信道非平稳特性,分析了多径的"生灭"特性。

As major prerequisite conditions for digital wireless communication design and optimization, channel measurement and modeling are always the research points that people focus on. This paper summarized the common channel measurement and multipath extraction methods and analyzed the principles of tap delay line （TDL） and cluster delay line （CDL） modeling. On the Basis of the wireless channel data measured in the U- shape cutting scenario of the Zhengzhou-xi＇an High-speed Railway, This paper analyzed the selective fading characteristic of channel frequencies in respect of the correlated scattering properties in the frequency domain and delay spread characteristics in the time domain, and then summed up the relationship between the time de lay and frequency domaon correlation. Regarding the cluster model for bandwidth channels, the cluster param eter were studied; regarding the non stationary characteristics of channels in a particular scenario （such as high-speed conditions）, the ＂birth-death＂ process of channel taps was studied.