Pulse or digital communications – Repeaters – Testing
Patent
1984-05-10
1987-03-24
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 86, 375 56, 329122, H04L 2722
Patent
active
046530711
ABSTRACT:
A PSK carrier recovery system has a frequency multiplier, a filter circuit and a limiter circuit for producing a double frequency signal from the incoming PSK signal. A pair of demodulators are supplied with the double frequency signal and with 0 and 90 degree phased reference signals of the same frequency to produce two output voltages representative of the phase of the incoming PSK signal. The output voltages are supplied through a pair of low pass filters at baseband frequency to a pair of remodulators which are also supplied with the reference signals. The outputs of the remodulators are added and applied to a filter, a limiter, a phase adjuster to compensate for processing delays and to a divide by 2 frequency circuit. The reconstituted signal has a frequency substantially equal to the incoming PSK signal and has a phase equal to one of the phases thereof. The incoming PSK signal is also supplied through a limiter to a demodulator circuit along with the reconstituted signal for demodulation.
REFERENCES:
patent: 3470478 (1969-09-01), Crafts
patent: 4318049 (1982-03-01), Mogensen
patent: 4338579 (1982-07-01), Rhodes
patent: 4355404 (1982-10-01), Uzunoglu
patent: 4409562 (1983-10-01), Kurihara
Griffin Robert L.
Telesz Jr. Andrew J.
Zenith Electronics Corporation
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