B301 APPLICATION OF RAIL TRANSMISSION TECHNOLOGY TO RAILWAY SIGNALS USING SPREAD SPECTRUM COMMUNICATION TECHNOLOGY

Spread spectrum (SS) communication technology and code-division multiple access (CDMA) technology are applied to implement high-speed rail transmission between ground facilities and trains with improved noise resistance performance. This transmission system aims at a transmission rate of 2,000 bps on a track circuit 600m in length. The algorithm of SS has been verified through simulation. Programs have been installed in a Digital Signal Processor (DSP) and experiments have been conducted on a track circuit simulator and a parallel dual-line circuit to establish the foundation for building the SS communication system on a full-scale track. Application of this new transmission system to the SS track circuit has also been investigated based on the SS rail transmission.