Demodulators – Phase shift keying or quadrature amplitude demodulator – Input signal combined with local oscillator or carrier...
Patent
1997-11-10
1999-03-16
Grimm, Siegfried H.
Demodulators
Phase shift keying or quadrature amplitude demodulator
Input signal combined with local oscillator or carrier...
359325, 375324, H04L 2738
Patent
active
058835482
ABSTRACT:
A demodulation system and method is used in a sensor system, such as a fi optic sensor system, that senses optical signals and modulates a phase generated carrier having a carrier frequency .omega..sub.c to form a modulated carrier. The modulated carrier is preferably undersampled at three times the carrier frequency (3.omega..sub.c), thereby maximizing the sensors' demodulated bandwidth relative to the sensors' sampling frequency. The undersampled, modulated carrier is orthogonally demodulated by multiplying the undersampled, modulated carrier by cos(.omega..sub.c (t.sub.o)) and sin(.omega..sub.c)(t.sub.o)) to extract even and odd harmonic components of the signal of interest. The even and odd harmonic components of the signal of interest are further demodulated by taking the square root of the sum of squares of the even and odd harmonic components, normalizing the even and odd harmonic components, and differentiating, cross-multiplying and differencing the normalized even and odd harmonic components to recover the signal of interest.
REFERENCES:
patent: 3693082 (1972-09-01), Jaecklin
patent: 5640125 (1997-06-01), Alard
patent: 5719673 (1998-02-01), Dorsel et al.
Assard Gerald L.
Blakely Barry A.
Deus III Antonio L.
Eipert William F.
Grimm Siegfried H.
McGowan Michael J.
Oglo Michael F.
The United States of America as represented by the Secretary of
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