Demodulation system and method for recovering a signal of interest from an undersampled, modulated carrier

Demodulation system and method for recovering a signal of interest from an undersampled, modulated carrier

A demodulation system and method is used in a sensor system, such as a fiber optic sensor system, that senses optical signals and modulates a phase generated carrier having a carrier frequency omega c to form a modulated carrier. The modulated carrier is preferably undersampled at three times the ca...

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Hauptverfasser: ASSARD, GERALD L, DEUS III, ANTONIO L, BLAKELY, BARRY A
Format: Patent
Sprache:eng
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BASIC ELECTRONIC CIRCUITRY
DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TOANOTHER
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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creator ASSARD
GERALD L
DEUS III
ANTONIO L
BLAKELY
BARRY A
description A demodulation system and method is used in a sensor system, such as a fiber optic sensor system, that senses optical signals and modulates a phase generated carrier having a carrier frequency omega c to form a modulated carrier. The modulated carrier is preferably undersampled at three times the carrier frequency (3 omega 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 c(to)) and sin( omega c)(to)) 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.
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subjects BASIC ELECTRONIC CIRCUITRY
DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TOANOTHER
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
title Demodulation system and method for recovering a signal of interest from an undersampled, modulated carrier
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