Demodulator and phase compensation method thereof

Details Demodulator and phase compensation method thereof Demodulator and phase compensation method thereof

2006-02-15

2008-11-25

Chang, Joseph (Department: 2817)

Demodulators

Phase shift keying or quadrature amplitude demodulator

Input signal combined with local oscillator or carrier...

C329S304000

Reexamination Certificate

active

07456682

ABSTRACT:
The exemplary demodulator of the present invention can eliminate effectively a phase fluctuation which cannot be fully eliminated by a carrier recovery loop (feedback loop), with subsequent feed-forward phase compensation loop which shares a phase detector of the carrier recovery loop. A carrier recovery loop receives a digital signal after a semi-synchronous detection, detects a phase shift of the digital signal to a predefined phase position in rectangular coordinate, and compensates for the phase of the received digital signal by a first compensation value on the basis of the detected phase shift to generate an output signal. A feed-forward phase compensation loop generates an average value of the phase shift, and compensates for the phase of the output signal by a second compensation value on the basis of the averaged phase shift value.

REFERENCES:
patent: 4871973 (1989-10-01), Yoshihara
patent: 5440268 (1995-08-01), Taga et al.
patent: 6411658 (2002-06-01), Sasaki
patent: 2002-111766 (2002-04-01), None

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