DocumentCode :
2620741
Title :
PLL based discrete time varying filter for estimation of parameters of a sine signal corrupted by a closely spaced FM interference
Author :
Wulich, Dov ; Plotkin, Eugene I. ; Swamy, M.N.S. ; Tong, Wen
Author_Institution :
Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, Que., Canada
fYear :
1990
fDate :
1-3 May 1990
Firstpage :
771
Abstract :
A method for the estimation of the parameters of a sine signal corrupted by a strong FM interference is presented. The method consists of two stages. In the first stage, an FM interference is transformed into a harmonic wave with known frequency by using a special time-warping technique. This harmonic interference is then rejected in the transformed time domain by a time-invariant constrained notch filter. The time-warping is implemented using nonuniform sampling obtained by utilizing a phase locked loop (PLL) technique. It is shown that such processing results in a 0-dB signal-to-interference ratio at the output independently of the signal-to-interference ratio at the input (for negative values in decibels). The second stage involves parameter estimation, where a constrained adaptive notch filter is used for the enhancement of a signal under analysis
Keywords :
adaptive filters; digital filters; filtering and prediction theory; frequency modulation; interference suppression; notch filters; phase-locked loops; signal detection; signal processing; PLL based discrete time varying filter; closely spaced FM interference; constrained adaptive notch filter; harmonic interference; nonuniform sampling; parameter estimation; phase locked loop; signal-to-interference ratio; sine signal; sine signal corrupted by interference; sinusoidal signals; time-invariant constrained notch filter; time-warping technique; transformed time domain; Frequency; Interference; Parameter estimation; Phase locked loops; Power harmonic filters; Sampling methods;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Circuits and Systems, 1990., IEEE International Symposium on
Conference_Location :
New Orleans, LA
Type :
conf
DOI :
10.1109/ISCAS.1990.112193
Filename :
112193
Link To Document :
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