APPLICATION OF SWEPT-FREQUENCY MODULATION TECHNIQUES TO PCM TELEMETRY.
Final rept., May 62-Aug 63,
MICHIGAN UNIV ANN ARBOR INST OF SCIENCE AND TECHNOLOGY
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This report gives design criteria for the application of the SFM technique to practical PCM telemetry systems. It compares optical, acoustic, and electrical techniques for generating and processing SFM signals, and it discusses the effects of doppler shift and multipath propagation on PCMSFM signals. Error rates have been calculated for a PCMSFM telemetry link operating in the presence of simultaneous gaussian and impulse noise. Errors due to single impulses, clusters of impulses, periodic impulses, and impulses having a Poisson distribution are treated. Computations are given for the approximate error rate when short channel interruptions or short fading periods are present. Consideration of the effects of impulse noise on SFM systems has indicated certain factors which may improve the performance of conventional PCM systems. Some of these factors are clipping, the use of more than minimum bandwidth, and an awareness of the significance of the average number of noise pulses occuring during a bit period. Author