INVESTIGATIONS OF ADVANCED ANALOG COMMUNICATIONS TECHNIQUES.
Final rept. for Dec 63-Dec 64,
CORNELL AERONAUTICAL LAB INC BUFFALO N Y
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This report presents the results, obtained by analytical investigations and by computer simulation, of studies of advanced techniques upon which the design of improved analog communication systems may be based. It includes the derivation of the optimal operations to be performed in the least mean-square error estimation of the modulation function in an FM communications system. Relationships between phase-locked loop demodulation and maximum-likelihood estimation of anglemodulated signals are developed. It is shown that a physically realizable phase-locked loop followed by an infinite-delay linear filter can perform the operations specified for the infinite-delay maximum likelihood estimator. Phase-locked loop demodulators for both PM and FM modulated signals are analyzed by the quasilinearization technique. It is shodn that analog computer simulation of phase-locked loop demodulators based on low frequency equivalent circuits, which contain a sinusoidal nonlinearity, is a practical means for the investigation of sumay be attained by simultaneous use of pre-transmission and post-detection filtering is examined. Author