PLL based discrete time varying filter for estimation of parameters of a sine signal corrupted by a closely spaced FM interference

Dov Wulich, Eugene I. Plotkin, M. N.S. Swamy, Wen Tong

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations

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.

Original languageEnglish
Pages (from-to)771-774
Number of pages4
JournalProceedings - IEEE International Symposium on Circuits and Systems
Volume1
StatePublished - 1 Dec 1990
Externally publishedYes
Event1990 IEEE International Symposium on Circuits and Systems Part 4 (of 4) - New Orleans, LA, USA
Duration: 1 May 19903 May 1990

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