3-4-2 Technologies of millimeter-wave road-vehicle communications

In recent years interest in ITS (Intelligent Transport Systems) technology has been growing, because it is thought that ITS can solve problems such as traffic jams and traffic accidents. Communication between roadside base stations and vehicles is a critical element of an ITS. In this paper, we describe the road-vehicle communication (RVC) system using ROF technology and software radio. These systems can realize multimode service and high speed data transmission. We developed RVC system using ROF technology which can transmit three kind of services (ETC, PHS, BS) simultaneously. The software radio with small size for mobile terminal is also developed. The overview of these systems is shown. In addition, activities of YRP (Yokosuka Research Park) ITS Joint Research Group are shown.