Digital demodulation with compensation for phase and frequency o

Details Digital demodulation with compensation for phase and frequency o Digital demodulation with compensation for phase and frequency o

1997-07-16

1999-07-06

Grimm, Siegfried H.

Demodulators

Phase shift keying or quadrature amplitude demodulator

329306, 329341, 375324, H04L 2722, H04L 2738

Patent

active

059202289

ABSTRACT:
A demodulation method for tentatively demodulating a modulated input signal by a signal having a fixed frequency to form a tentative complex demodulated signal and then generating a determined complex demodulated signal from the tentative complex demodulated signal. The method includes step (a) of obtaining a determined complex demodulated signal by compensating for the tentative complex demodulated signal based on an optimum phase compensation amount; step (b) of estimating an optimum frequency compensation amount based on a shift in the optimum phase compensation amount during a predetermined cycle; and step (c) of estimating an immediately subsequent optimum phase compensation amount to be used in the steps (a) and (b) performed in repetition, based on the tentative complex demodulated signal, the determined complex demodulated signal, and the optimum frequency compensation amount.

REFERENCES:
patent: 4847797 (1989-07-01), Picchi et al.
patent: 5097220 (1992-03-01), Shimakata et al.
patent: 5287067 (1994-02-01), Denno et al.

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