Demodulation device for composite PSK-PSK modulated waves

Details Demodulation device for composite PSK-PSK modulated waves Demodulation device for composite PSK-PSK modulated waves

1983-05-04

1985-02-05

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329112, 329167, 375 82, 375 83, H03D 300, H03D 306

Patent

active

044980507

ABSTRACT:
A demodulator for a composite PSK-PSK modulated signal having a 2.sup.n -phase main data signal and a 2-phase subdata signal including a frame signal, said demodulator comprising an orthogonal detector 21 producing two orthogonally demodulated signals P, Q, a subdata reproducing section 50 for phase-shifting the orthogonal signals and multiplying together the phase-shifted signals to reproduce the subdata signal, a lock-in phase discriminator 42 for detecting the frame synchronization, and a main data reproducing section 51 for phase-shifting and switching the orthogonal signals in response to the phase discriminator and the reproduced subdata signal to reproduce the main signal.

REFERENCES:
patent: 4099130 (1978-07-01), Yoshida
patent: 4255713 (1981-03-01), Yoshida
patent: 4334312 (1982-06-01), Yoshida

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