Demodulators – Phase modulation demodulator
Patent
1988-12-23
1989-10-03
Mis, David
Demodulators
Phase modulation demodulator
329304, 375 81, 375 82, 375 85, 375 97, H03D 318, H03K 904
Patent
active
048719749
ABSTRACT:
A demodulator mechanism which uses estimates of the in-phase and quadrature-phase components of differential phase modulated carrier signals for performing a coherent demodulation of these signals is described. The instantaneous estimates, obtained from an estimator circuit, are fed into a differential carrier recovery circuit, which provides for a feedback of ideal sine and cosine components, and combined with the instantaneous estimates for incrementally decreasing a phase error signal generated in a computational circuit. By thus incrementally decreasing the phase error signal, an ideal phase angle is eventually obtained, thereby providing for coherent demodulated output components of the input carrier signals.
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Davis Gordon T.
Mandalia Baiju D.
International Business Machines Corp.
Mis David
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