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.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
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)
关键词
高铁无线信道
高架桥
信道测量
莱斯K因子
LTE-R
wireless channel of high-speed railway
viaduct
channel measurement
Ricean K-factor, LTE-R
