July 1969 | NTIA Technical Memo ERL TM ITS 180

Computer synthesis of simulcast broadcasting

J. V. Cateora

Abstract: Simulcast is a system of broadcasting in which several carriers, each containing the same information and having equal frequencies, are used. In such a system, transmitter frequency drift, random phase between transmitters, and other factors will cause deep fading or complete cancellation of the received signal. A simulcast system with three carriers, with slight frequency off-sets, was simulated by digital com­puter, and the combined received signal was statistically analyzed. Emphasis is placed on the statistics within an information bit time for the proposed simulcast system. Computer plots of the individual carriers, combined carriers, cumulative amplitude distribution, and probability density functions are included.

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Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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