Coherent demodulating device with carrier wave recovering digita

Pulse or digital communications – Repeaters – Testing

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375 88, 375119, 329304, 329306, H04L 2722, H03D 100

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active

053012100

ABSTRACT:
A coherent demodulating device is characterized by a demodulating circuit and a carrier recovering circuit produced entirely in digital form. Two quadrature demodulation carrier waves produced by a local oscillator are mixed with a demodulation carrier signal modulated by symbols to produce analog signals. The analog signals are digitized by sampling at symbol reception frequency into incoming digital signals. A digital phase shifter phase shifts the incoming signals by a demodulation phase derived by a phase loop digital processing circuit as from error signal pulses supplied by a comparing circuit receiving outgoing digital signals from the phase shifter. The compensation for the phase and frequency differences between the demodulation and modulation carrier waves is carried out a posteriori in digital form by phase shifting the incoming signals.

REFERENCES:
patent: 4859956 (1989-08-01), Mizoguchi
patent: 4959619 (1990-09-01), Delacroix et al.
patent: 5001727 (1991-03-01), McDavid
patent: 5025455 (1991-06-01), Nguyen
patent: 5170415 (1992-12-01), Yoshida et al.
Phaselock Techniques by Floyd M. Gardner, Ph.D., John Wiley & Sons, Inc., 1966, pp. 8-23.

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