A study of train communication systems for future railways using multimeter-wave radio

This paper presents a concept of multimedia railway information and communication system for train operation and passengers, which is intra-network system for railway information connected to public network. And this paper proposes a new train radio communication system between trains and ground facilities which adopts subcarrier multiplexed (SCM) lightwave system in feeder links and 45 GHz band millimeter wave radio communication system in radio links, for aiming high-speed and large-capacity communication such as multi-channel quasi-videos. Also this paper describes performance estimation of this proposed system obtained by computer simulation. Results of estimation show a high degree of feasibility in all cases