Various info-communication services in the Intelligent Transport Systems (ITS) must take an important role in safe and comfortable driving, which services are provided with cellular telephone systems, Dedicated Short-Range Communications (DSRC), and digital broadcasting television. Especially, the DSRC from roadside to vehicles are expected as a local ITS services. The DSRC is the basis for ITS applications like electronic toll collection (ETC), traffic and traveler information, public transport, emergency dispatch services, parking management, etc. However, new services may require new on-board equipment. Furthermore, it is necessary that the content provided by DSRC service is revised or expanded with a gradual improvement on infrastructure of DSRC info-communication systems. Similarly, wireless communication technology related to vehicular terminal equipment is progressively improved. As a result, even signal processing scheme at the low-level or the physical layer of the DSRC applications will need upgrading from an existing system to an advanced one. Software defined Radio (SDR) technology provides an efficient and comparatively inexpensive mechanism for the production of multi-mode, multi-band, multi-functional wireless devices that can be enhanced using software upgrades. Some experimental multi-mode wireless terminals using SDR technology, which were basically designed with a usage of cellular telephone systems, have been reported. In this paper, however, a high-speed DSRC multimode-terminal using SDR technology, which has been expected as a signal-processing platform of ITS info-communications, was examined.
Samenvatting