Phase controlled demodulation system for digital communication

Details Phase controlled demodulation system for digital communication Phase controlled demodulation system for digital communication

H - Electricity

04

B

329/2

H04B 1/10 (2006.01)

Patent

CA 1333922

A phase controlled demodulation system for digital communication includes a quadrature detector for receiving a modulated digital signal and generating therefrom a pair of I and Q demodulated signals. A phase difference detection and filter circuit detects a phase difference between the I and Q demodulated signals, and another circuit detects a carrier-to- noise ratio of one of the I and Q demodulated signals. A further circuit detects a ratio difference between the detected carrier-to-noise ratio and a predetermined value, and a voltage controlled oscillator responsive to the detected phase difference and the detected ratio difference generates a carrier as a replica of the carrier of the received digital signal and applies the carrier to the quadrature detector.

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