Abstract
AbstractThe FM multiplex broadcasting is one of the broadcasting configurations for providing a new service, where digital signals are multiplexed by utilizing the empty spectrum of the baseband signal in the FM stereo broadcasting. The fixed reception FM multiplex broadcasting system, where reception is done by setting up an antenna has already been developed and used in practice, and its broadcasting has been started. On the other hand, it would be desirable to develop a mobile reception FM multiplex broadcasting system with a certain amount of transmission capacity, where the broadcast can be received by a car or portable radio, for an application to the traffic information transmission. As to the digital transmission to moving objects, interferences such as fading and multiple paths are known to be present and the technical difficulty is increased with the increase of the bit rate. Furthermore, there are difficulties in the FM multiplex broadcasting such as the cross‐talk from the sound signal, due to the nature of the multiplex signal. Only a very low bit‐rate system of about 1 kbit/s has been developed such as RDS (Radio Data System) [1] in Europe for practical applications to the mobile reception. This study aims at the development of a mobile reception FM multiplex broadcasting system with a higher bit rate. An FM multiplex transmission simulator is constructed first, and the transmission characteristics inherent to the FM multiplexing are analyzed. A digital modulation method suited to these transmission characteristics is presented. By laboratory and field transmission tests, the effectiveness of the proposed digital modulation scheme is demonstrated.
Published Version
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