PSK demodulator using asynchronous local oscillator

Details PSK demodulator using asynchronous local oscillator PSK demodulator using asynchronous local oscillator

1984-12-14

1986-10-21

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329124, 375 82, 375 84, 375 94, H04L 2722

Patent

active

046188304

ABSTRACT:
A PSK demodulator, by which a first output signal obtained from a local oscillator circuit working asynchronously with respect to the carrier phase of an inputted burst PSK signal and a second output signal shifted in phase by 90.degree. with respect to the first output signal are multiplied by the inputted burst PSK signal by means of a first multiplier and a second multiplier, respectively. Each of the output signals from the first and second multipliers are compared with a first reference voltage and a second reference voltage, which is lower than the first reference voltage. The output signals are classified into 4 sorts of level signals, those which are higher than the first reference voltage and those which are lower than the second voltage; and thus the inputted burst PSK signal is demodulated by using these 4 sorts of level signals.

REFERENCES:
patent: 4540948 (1985-09-01), Ryu

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