Impact of train speed on communication quality in OFDM-based CBTC system
ZHANG Heng
ZHU Li
WANG Hongwei
XIN Xin
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.
Keywords：CBTCorthogonal frequency division multiplexingchannel estimationframe error rate
Publication Date：2023-10-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 56-62 )