Abstract
The key technical elements in designing digital mobile satellite communication systems are identified, and tradeoff studies on the transmission parameters of the satellite link, which were based on experience with an experimental system and the results of field trials, on digital maritime and aeronautical satellite communication systems, are described. The future evolution of the various new communication services to be offered in the digital mobile communication systems are discussed. In the digital mobile satellite communication systems which will be operated under the condition of low C/N and with a signal-level fluctuation due to multipath fading etc., it has been found that the most important requirement is to establish the frame synchronization quickly and maintain it stably in addition to the stable carrier/clock tracking, under this severe link condition. >
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