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Fuzzy logic for digital phase-locked loop filter design

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2 Author(s)
Simon, D. ; TRW Test Lab., Mesa, AZ, USA ; El-Sherief, H.

The problem of robust phase-locked loop design has attracted attention for many years, particularly since the advent of the global positioning system. This paper proposes and demonstrates the use of a fuzzy PLL to estimate the time-varying phase of a sinusoidal signal. It is shown via simulation results that fuzzy PLL's offer performance comparable to analytically derived PLL's (e.g. Kalman filters and H estimators) when the phase exhibits high dynamics and high noise. The fuzzy PLL rules are optimized using a gradient descent method and a genetic algorithm

Published in:

Fuzzy Systems, IEEE Transactions on  (Volume:3 ,  Issue: 2 )

Date of Publication:

May 1995

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