Method and apparatus for a PSK signal detector

Details Method and apparatus for a PSK signal detector Method and apparatus for a PSK signal detector

1979-06-29

1980-11-11

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329107, 329111, 375 83, 375 84, H04L 2722

Patent

active

042335655

ABSTRACT:
An improved method and apparatus for detecting the presence of PSK data signals is disclosed. Each data bit of the PSK data signal is encoded with N half-cycle intervals of a carrier signal. In the PSK signal detector, the carrier signal is recovered from the received PSK data signal. The recovered carrier signal is frequency locked to, and at 0.degree. or 180.degree. with respect to, the carrier signal transmitting the PSK data signal. The cross-correlation integral is evaluated between the recovered carrier signal and received PSK data signal for successive half-cycle intervals separated by one data bit to provide corresponding quality signals. An indication that the PSK data signal is present is provided when the magnitude of one of the quality signals is greater than a predetermined magnitude. The data-present indication signal may be further combined with an RF squelch signal provided by a radio receiver for enhancing reliability when the data detector is used in a radio receiver.

REFERENCES:
patent: 3758860 (1973-09-01), Braun et al.
patent: 3939431 (1976-02-01), Cohlman
patent: 3995225 (1976-11-01), Horn
Belanger, "Single Op. Amp. Full-Wave Rectifier has no DC Offset", EDN, Apr. 5, 1977, pp. 144, 146.

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