UHF radio propagation map using GPS and TV broadcasting wave

A future service planned for Japan is called Information Services (IS). In order to provide it effectively with broadband, mobility, asymmetric, and multicast features, we have proposed a new type of information platform where digital mobile communication networks and digital TV broadcasting media are synergistically utilized (Nishi, M. et al., GLOBECOM2001, p.552-6, 2001; Proc. IEEE AP-S2002, vol.1, p.252-5, 2002). We apply the UHF band (470 to 770 MHz) TV broadcasting media to the broadband download media and apply the existent mobile communication network to the upload media without using higher frequency bands. Consequently, not only asymmetric traffic can be supported, but also the service area can be enlarged and high mobility can be easily achieved. It is important to obtain the propagation characteristics of UHF band radio waves in mobile outdoor environments for constructing the proposed platforms. Using GPS systems and a digital database of 3D terrain information, we compare the UHF band radio propagation maps and the terrain LOS areas from the TV broadcasting transmission stations in order to advance the site-specific propagation prediction in UHF band.