1975-09-08
1977-04-12
Safourek, Benedict V.
325 30, 325 65, H04B 162
Patent
active
040177980
ABSTRACT:
Demodulation of a wideband spread spectrum four-phase PSK (phase shift keyed) modulated carrier signal is accomplished by means of a correlator which phase shifts the modulated carrier signal as a function of a locally generated PN (pseudo-noise) sequence to provide a narrow band two-phase PSK modulated carrier signal. The two-phase modulated signal is fed to a matched filter wherein undesired signal components are removed so as to provide an IF (intermediate frequency) signal. A carrier recovery phaselock loop demodulates the two-phase modulated IF signal to provide a baseband signal. A timing recovery loop operates upon the baseband signal to provide timing signals for the locally generated PN sequence to synchronize the local PN sequence with the modulated carrier sequence. A bit timing loop and a sample and hold means operate upon the baseband signal to detect the modulating data to provide an output signal which is a function of the modulating data.
REFERENCES:
patent: 3706933 (1972-12-01), Bidell et al.
patent: 3916313 (1975-10-01), Lowry
Anderson Alfred T.
Gordy Robert S.
Sanders David E.
Cavender J. T.
Dugas Edward
NCR Corporation
Safourek Benedict V.
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