Automatic frequency control method and circuit for correcting an

Details Automatic frequency control method and circuit for correcting an Automatic frequency control method and circuit for correcting an

1993-01-28

1994-12-13

Mis, David

Demodulators

Phase shift keying or quadrature amplitude demodulator

Input signal combined with local oscillator or carrier...

329308, 329309, 329310, 375 81, 375 82, 375 85, H03C 300, H03D 300, H03D 320, H04L 2714

Patent

active

053732472

ABSTRACT:
An AFC method is used in a demodulator, which employs a 2.sup.n -phase phase shift keying modulation system, where n is an integer greater than or equal to two, to correct an error between a received carrier frequency and a local frequency. The AFC method includes the steps of (a) subjecting an intermediate frequency signal of a signal received by the demodulator to a quadrature wave detection to obtain I-axis and Q-axis signals, (b) converting amplitude information of the I-axis and Q-axis signals into phase information which includes frequency information, and (c) correcting the local frequency based on the frequency information included in the phase information.

REFERENCES:
patent: 4238739 (1980-12-01), Mosley et al.
patent: 4250456 (1981-02-01), Shinmyo et al.
patent: 4470145 (1984-09-01), Williams
patent: 5068876 (1991-11-01), Yoshikawa et al.
patent: 5260671 (1993-11-01), Iso et al.
patent: 5282227 (1994-01-01), Crawford

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