Abstract
Abstract : In this report we present some additional results on the performance of carrier sense multiple access (CSMA) protocol for mobile packet radio networks (MPRNET). This is followed by a review of bandwidth efficient digital modulation for mobile radios and some results on a speech transmission scheme and an analysis of mismatched continuous phase FSK (CPFSK) receivers. Carrier sense multiple access protocol has been analyzed in detail for mobile radio channel. Throughput and delay expression are derived to include the effects of fading. The performance degradation due to hidden terminal problems is analyzed. This is followed by an evaluation of the performance of CSMA with collision detection (CSMA-CD) for FH-FSK spread spectrum mobile packet radio networks. A class of spectrally efficient modulation has been reviewed for application to mobile radio systems. A speech transmission scheme using DPCM coding and these spectrally efficient modulation is seen to compete with existing schemes. Mismatched CPFSK receivers have been analyzed to understand how time and phase synchronization errors influence the performance. A set of curves is provided to demonstrate the degradation due to imperfect carrier phase of symbol time synchronization error for both low and high SNR.
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