Frequency controlled loop for demodulating OOK and PSK signals

Details Frequency controlled loop for demodulating OOK and PSK signals Frequency controlled loop for demodulating OOK and PSK signals

1993-07-30

1994-11-15

Grimm, Siegfried H.

Demodulators

Phase shift keying or quadrature amplitude demodulator

Input signal combined with local oscillator or carrier...

329311, 331 12, 375 81, 375120, H04L 2722

Patent

active

053651855

ABSTRACT:
A method and apparatus for producing a frequency-controlled loop in a phase-diversity receiver for demodulating received ON-OFF-keyed (OOK) and phase shift keying (PSK) signals, by feeding a reference frequency signal and the received signals to a quadrature mixer (QM) which produces two output signals in phase quadrature at nominally zero intermediate frequency. Quadrature continuous wave signals void of the modulation are produced from the phase quadrature output signals. A voltage proportional to the frequency of the quadrature continuous wave signals is generated and is utilized for controlling the frequency of the generated reference frequency signal.

REFERENCES:
patent: 3768030 (1973-10-01), Brown et al.
patent: 5062123 (1991-10-01), Geile et al.

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