中文摘要：

基于高铁场景的信道测量与分析，有利于宽带无线通信系统在高铁上的实现和优化。本文以速度为200 km/h的郑西高铁高架桥环境下宽带无线接入为应用背景，对2.35G Hz频点下50M Hz带宽的无线信道进行测量。基于实测数据，将列车穿越发射机的信道变化过程划分为4个区域（RA ，TA ，CA ，AA），并从频域和时域两个角度对不同区域中的高铁无线信道特性进行分析。讨论频域的相关散射特性，研究时域的时延扩展特性，阐述在不同区域中信道特性变化的原因，验证了通过频域相关和rms时延扩展两种方法得到的相干带宽的一致性。

英文摘要：

Channel measurement and modeling analysis made for high-speed railways （HSRs） is a major prereq-uisite for the broadband wireless communication design and optimization.In this paper ,measurements of 50 M Hz-wide wireless channels were conducted at 2.35GHz on the Zhengzhou-Xian HSR viaduct with the speed of 200 km/h.On the basis of the changes of the measurement data ,the w hole channel changing process in w hich the measured train passed by the transmitter was divided into four areas i.e. ,the remote area（RA） ,toward area （TA） ,close area（CA）and arrival area（AA）.The characteristics of the HSR wireless channels through the a-bove four areas were analyzed from the frequency domain and time domain respectively.The correlated scatter-ing characteristics in the frequency domain and the delay spread characteristics in the time domain were dis-cussed.Reasons for the changes of channels in different areas were interpreted.Finally the correlation band-widths calculated by the frequency correlation and the rms delay spread methods were compared and the consis-tency w as verfied.