Mono-component AM–FM Signal Decomposition Based on Discrete Second-Order Generalized Integrator Phase-Locked Loop

A mono-component AM–FM signal decomposition method is proposed using discrete second-order generalized integrator and phase-locking scheme. A discrete second-order generalized integrator (SOGI) is employed in the algorithm as a quadrature signal generator for a center carrier frequency. The outputs...

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Bibliographic Details
Published in:Circuits, systems, and signal processing systems, and signal processing, 2017-04, Vol.36 (4), p.1604-1620
Main Authors: George, Aby K., Sumathi, P.
Format: Article
Language:English
Subjects:
Algorithms
Circuits and Systems
Decomposition
Demodulation
Demodulators
Electrical Engineering
Electronics and Microelectronics
Engineering
Frequency distribution
Frequency variation
Instrumentation
Integrators
Phase locked loops
Quadratures
Signal processing
Signal,Image and Speech Processing
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Summary:A mono-component AM–FM signal decomposition method is proposed using discrete second-order generalized integrator and phase-locking scheme. A discrete second-order generalized integrator (SOGI) is employed in the algorithm as a quadrature signal generator for a center carrier frequency. The outputs from SOGI are in-phase and quadrature components of the AM–FM signal. These components are processed in the discrete phase-locked loop to estimate instantaneous frequency variation and instantaneous amplitude variation. The estimated instantaneous frequency variation is fed back to SOGI to adjust the center frequency. Proposed mono-component AM–FM demodulator is implemented in FPGA platform. The algorithm offers good acquisition time, accuracy, and operating range. Experimental investigations performed on the algorithm prove the efficacy and suitability of the algorithm for mono-component AM–FM demodulation.
ISSN:0278-081X
1531-5878
DOI:10.1007/s00034-016-0380-x