H - Electricity – 04 – L
Patent
H - Electricity
04
L
329/3
H04L 27/22 (2006.01) H04L 27/227 (2006.01) H04L 27/00 (2006.01)
Patent
CA 1278835
Abstract The invention relates to a multi-phase PSK demodulator. It includes a quadrature detector for demodulating a PSK signal in response to a carrier wave to provide demodulated analog signals. A converter is provided for converting the demodulated analog signals to digital signals. A synchronization decision circuit responsive to the digital signals decides whether or not synchroni- zation is established and provides a first control signal. A carrier recovery circuit, including a voltage controlled oscillator provides an error voltage in response to the digital signals. The voltage controlled oscillator provides the carrier wave in response to the error voltage. A false synchronization detector detects a false synchronization by monitoring the error voltage, thereby providing a second control signal. Finally, a sweep controller is provided for supplying a sweep signal or a predetermined level signal to the input of the voltage controlled oscillator in res- ponse to the first and second control signals. The invention is capable of cancelling false synchronization when it occurs.
567060
Corporation Nec
Smart & Biggar
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