Rapid acquisition demodulation system

Details Rapid acquisition demodulation system Rapid acquisition demodulation system

1983-08-12

1987-03-24

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329122, 329124, 375 94, 375111, 375120, 455265, H03D 318

Patent

active

046528342

ABSTRACT:
Apparatus for acquiring and demodulating a communication signal employing a feedforward approach to minimize acquisition time. The apparatus includes a phase detection circuit for generating a phase difference signal indicative of the phase difference between an incoming signal and a local reference oscillator, and a phase rotation circuit for adjusting the phase of the local reference by the amount of the phase difference signal, so that the rotated local reference matches the phase of the incoming signal. Basically the same approach is used for carrier acquisition and for data clock acquisition or bit synchronization. A data resolution circuit removes the phase-angle effect of data modulation from the phase error signal, so that an accurate carrier phase error signal is obtained even when the carrier is modulated by data. A special embodiment of the data resolution circuit is provided for the case of non-random data signals.

REFERENCES:
patent: 3676593 (1972-07-01), Muratani et al.
patent: 3769587 (1973-10-01), Matsuo et al.
patent: 4100499 (1978-07-01), Monrolin
patent: 4383324 (1983-05-01), Dudek et al.
patent: 4409562 (1983-10-01), Kurihara

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