北京交通大学学报2023，Vol.47Issue(5)：56-62,7.DOI:10.11860/j.issn.1673-0291.20220091
基于OFDM技术的CBTC系统中列车速度对车地通信传输性能的影响
Impact of train speed on communication quality in OFDM-based CBTC system
摘要
Abstract
The Communication-Based Train Control(CBTC)system is a train control system that uses advanced communication and computer technologies to continuously control and monitor train opera-tions.To enhance the transmission efficiency of the CBTC system,the Orthogonal Frequency Divi-sion Multiplexing(OFDM)technology is applied to CBTC systems.Starting from the operational prin-ciples of the OFDM system,this study investigates the impact of train speed on the non-orthogonality of subcarriers in the OFDM system.Using the parameters of OFDM in Wireless Local Area Net-works(WLAN)technology as an example,a comprehensive analysis and calculation of the channel co-herence time variation caused by train speed are conducted.Theoretical calculations and simulation re-sults show that the impact of train speed on inter-subcarrier orthogonality is negligible.Additionally,under the same message length and different train speeds,the lowest transmission rate does not neces-sarily result in the lowest Frame Error Rate(FER).Communication systems should choose different transmission rates according to the channel time variation and message length to obtain the lowest FER.关键词
CBTC/正交频分复用/信道估计/误帧率Key words
CBTC/orthogonal frequency division multiplexing/channel estimation/frame error rate分类
交通工程引用本文复制引用
张衡,朱力,王洪伟,辛鑫..基于OFDM技术的CBTC系统中列车速度对车地通信传输性能的影响[J].北京交通大学学报,2023,47(5):56-62,7.基金项目
国家自然科学基金(61973026)National Natural Science Foundation of China(61973026) （61973026）
