Research in Source-Channel Coding and Communication Networks

摘要

An extension of Shannon's information theory and an analysis of dynamic multiple-access disciplines for communication channels and networks were studied with an emphasis on applications to satellite communication channels and computer communication networks. New techniques were developed for analyzing the performance of these communication systems. A more complete understanding was obtained of the interaction of communication channels and their relationship to the overall performance where dynamic multiple-access disciplines are considered. This research demonstrates that the maximum likelihood Viterbi demodulator can effectively overcome intersymbol interference. This means that higher data rates can be achieved, even over nonlinear satellite channels, if receivers have the Viterbi demodulation processing. Precise message-delay distributions for TDMA, reservation, and Group Random Access strategies were derived. Various packet-by-packet, message-by-message, stop-and-wait and continuous ARQ schemes were compared. The performance of several network synchronization strategies also were studied, with consideration of master-slave and mutual synchronization schemes.