8-phase phase-shift keying demodulator

Details 8-phase phase-shift keying demodulator 8-phase phase-shift keying demodulator

1987-07-08

1989-02-07

Laroche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329107, 329110, 329124, 329131, 375 86, 375 98, 375103, H03D 318, H03K 906

Patent

active

048034380

ABSTRACT:
In order to rapidly bring a 8-phase phase shift keying demodulator into resynchronization upon the demodulator going out of synchronism, a plurality of error signals produced within the demodulator is used to determine whether a signal point of an incoming 8-phase phase modulated signal is usable for controlling a transversal filter. An asynchronism signal, which indicates whether the demodulator is synchronized, is derived from the demodulator and being applied to a tap gain control signal generator coupled to the transversal filter. The tap gain control signal generator is controlled when the asynchronism signal indicates asynchronism of the demodulator.

REFERENCES:
patent: 4540948 (1985-09-01), Ryu
patent: 4567599 (1986-01-01), Mizoguchi
patent: 4703282 (1987-10-01), Yoshida

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