Rapid acquisition shift keyed signal demodulator

Details Rapid acquisition shift keyed signal demodulator Rapid acquisition shift keyed signal demodulator

1980-11-07

1982-11-16

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329124, 375 83, H03D 306, H04L 2722

Patent

active

043596924

ABSTRACT:
A shift keyed phase detector having a first input for receiving a signal including data shift keyed modulated on a carrier, such as BPSK, QPSK, MSK, SMSK, etc., and a second input for receiving a reference frequency from a local oscillator, to supply in-phase and quadrature channel data signals at differing phase error angles relative to the local oscillator reference frequency. The in-phase and quadrature channel signals are squared, and the squared signals are summed and filtered to provide a first phase error signal. The in-phase and quadrature channel signals are also multiplied with each other and filtered to provide a second phase error signal. The in-phase and quadrature channel signals are cross-multiplied with each of the phase error signals and then combined to provide a data signal in phase with the original data signal.

REFERENCES:
patent: 3189826 (1965-06-01), Mitchell et al.
patent: 3568067 (1971-03-01), Williford
patent: 3588720 (1971-06-01), Fluhr
patent: 4085378 (1978-04-01), Ryan et al.

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