The Frequency Compensation to eliminate ICI in CBTC system

The CBTC system is an advanced train control system which makes use of big-capacity digital communication between wayside and train, to transfer the information of the status of the train, as well as the controlling information. To prevent accidents which cause severe people injure and finance loss, the information reliability to be guaranteed. The metro railway wireless communication channel is complex for multi-path propagation, the receiving signal will suffer strong ISI and communication performance will be severely downgraded. OFDM is able to improve the performance of the wireless communication in CBTC, however, OFDM signals will suffer ICI when they are transmitted in the multi-path channel of the CBTC, so how to reduce the ICI of the CBTC system is the main problem at present Firstly, this paper analyzes the multi-path channel of the CBTC, gets the conclusion of ICI caused by multi-path resides in the railway and establishes the model of it. By means of the analysis of the model, we propose the Frequency Compensation method to reduce the ICI of the system. Finally, extensive simulations show that the Frequency Compensation method is able to improve the performance of the system.