Qiepu clock restoring device for quick correcting error

Abstract

The chirp clock restoring device for directly sequential frequency expansion BPSK/QPSK communication receiver includes fixed correlator, shift correlator, VCO control loop, gate circuit, data feedback branch, L counter and other parts. In the chirp clock restoring part, there are additional shift correlator, feedback branch and gate circuit except the fixed correlator. The VCO producing chirp clock is controlled simultaneously by the fixed correlator and the shift correlator to reduce bit error rate. The present invention can raise chirp clock restoring track speed and quality, and it may be used widely in communication receivers and is suitable for spot-to-spot frequency expansion communication,spot-to-spots frequency expansion communication and CDMA mobile communication.