Phase-shift keying demodulator

Details Phase-shift keying demodulator Phase-shift keying demodulator

1984-06-26

1986-08-26

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329110, 329122, 329126, 375 56, 375 84, H03K 906

Patent

active

046085408

ABSTRACT:
A PSK demodulator demodulate a PSK signal into a digital data, which PSK signal is an encoded signal comprising a carrier phase shifted by a digital signal data. The PSK demodulator comprises: a reference signal oscillator; first multiplier which multiplies the PSK signal and first reference signal supplied from the reference signal oscillator and having the same frequency as that of the carrier, and provides first low pass component as a carrier phase data as the result of the multiplication; second multiplier which multiplies the PSK signal and second reference signal supplied from the reference signal oscillator and having 90 degrees phase difference from the first reference signal, and provides second low pass component as another carrier phase data as the result of the multiplication; analog-to-digital converters which convert the first and second low pass components to digital signals; memories which store the digital signals from the analog-to-digital converters for a time corresponding to one symbol; and a discriminator which compares each digital signal with the one symbol preceding digital signal stored in the memories and discriminates whether the phase difference between the two digital signals is .theta. or .theta..+-.180.degree..

REFERENCES:
patent: 3993956 (1976-11-01), Gilmore et al.
patent: 4348641 (1982-09-01), Scott et al.
patent: 4470147 (1984-09-01), Goatcher
patent: 4521892 (1985-01-01), Vance et al.

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