Carrier recovery scheme for a SSB-SC signal

Details Carrier recovery scheme for a SSB-SC signal Carrier recovery scheme for a SSB-SC signal

1974-11-13

1976-10-05

Safourek, Benedict V.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325 49, 325 50, 329154, H04B 130

Patent

active

039847780

ABSTRACT:
A system is provided for extracting the proper carrier phase from a single sideband suppressed carrier signal. A received signal is equalized and then product demodulated by estimated in-phase and quadrature carriers produced by a voltage controlled oscillator (VCO). The outputs of the in-phase and quadrature product demodulators are low-pass filtered producing corresponding in-phase and quadrature baseband signals. An estimator compares the in-phase baseband signal with reference levels, samples the output of the comparing circuit at the band rate and generates a sequence of estimated data signals. The error signal, which forms the input to the VCO, is produced by multiplying the recovered quadrature baseband signal with the estimated data signals and is proportional to the product of the square of the low pass filtered baseband signal and the sine of the difference between the phases of the received carrier and estimated carrier.

REFERENCES:
patent: 3391341 (1968-07-01), Eddy
patent: 3669511 (1972-06-01), Motley et al.

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