Coherent phase shift keyed demodulator

Abstract From the Canadian patent

A demodulator mechanism which uses estimates of the in-phase and quadrature-phase components or 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 …