The Wireless Anti-interference Analysis Between Metro On-board And Trackside System

With the development of science and society,Metro has replaced other vehicles in our daily life.Now metro use the CBTC system,which based on communicating between on-board and trackside.Using 802.11b/g protocols.For 2.4GHz is free frequency,interference is exist,such as WiFi,when influenced,PER increased and maybe the communication will be broken,the signal system will trigger emergency break and the service will be affected.The thesis describes from theoretical analysis,test and simulator.Fistly,In 2.4Ghz 13 channels,theoretical analysis bases on the interference factor,the conclusion is with the increase of channel interval,the interference will be decreased and test conclusion is the same.Second,based on CBTC interference by WiFi,the CBTC model will be set,the theoretical analysis is with the number of WiFi increased,the affect on through put is larger.The NS get the same conclusion.The thesis gives the optimal design,such as frequency reasonable planning,multi-frequency issues,narrow-band issues,shield equipment added and so on.It is important to increase the safety and operation quality.