基于测量的高铁宽带无线信道莱斯K因子研究  

Measurement-based Research on Ricean K-factor of Broad-band Wireless Channel in High-speed Railway Scenarios

作　　者：周涛[1] 陶成[1] 刘留[1] 谈振辉[1] 孙溶辰[1] 

机构地区：[1]北京交通大学宽带无线移动通信研究所,北京100044

出　　处：《铁道学报》2013年第9期72-78,共7页Journal of the China Railway Society

基　　金：国家科技重大专项项目(2011ZX03004;2011ZX030-006);国家自然科学基金项目(61102050);北京市自然科学基金项目(4122061);中央高校基本科研业务费专项资金(2013YJS016)

摘　　要：随着高速列车与地面间通信需求的提高,现有窄带铁路列控系统(GSM-R)将向未来基于LTE的宽带铁路通信系统(LTE-R)平滑演进。无线信道测量与参数提取是设计新一代高铁通信系统的前提。莱斯K因子是表征信道衰落程度的重要参数,因此研究高铁宽带无线信道的K因子特征具有重要意义。本文基于郑西(郑州—西安)高铁高架桥场景信道测量数据,分别提取窄带和宽带K因子。分析窄带K因子的时频变化特性,建立基于收发端相对距离的窄带K因子统计模型。探索宽带K因子随信道带宽变化的规律,给出基于信道带宽的宽带K因子统计模型。最后,讨论了不同多径时延的K因子特征。Owing to higher and higher requirements for communication between the high-speed train and the ground,the existing narrow-band train control system（GSM-R）has been commonly recommended to be evolved smoothly into a broadband railway communication system based on long term evolution （LTE-R）.Wireless channel measurements and parameter extraction are the prerequisites for designing of the novel wireless communication system.The Ricean K-factor is a fundamental parameter of the wireless channel,which directly reflects the fading severity and communication quality.Consequently,deep research on such a characteristic of railway wireless channels is of utmost importance.In this paper,narrow-band and broadband K-factor were extracted respectively from channel data measured in the viaduct scenario of the Zhengzhou-Xi＇an （ZX） High-speed Railway.For the narrow-band K-factor,the characteristics of time and frequency variability were analyzed and a distance-dependent statistical model was built.For the broadband K-factor,the law of its changing with bandwidth was explored and a bandwidth-dependent statistical model was built.Finally,the K-factor variation with different delay bins was discussed.

关 键 词：高铁无线信道 高架桥 信道测量 莱斯K因子 LTE-R 

分 类 号：TN929.5[电子电信—通信与信息系统] U285.21[电子电信—信息与通信工程]