Discrete time-varying filter and PLL for synchronous estimation of parameters of a sine signal corrupted by a closely spaced FM interference

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

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The concept of time-varying filters as applied to the problem of rejection of a sine signal with fast variations of frequency is explored. Using such filters, a method for synchronous (i.e., when frequency is known) estimation of phase and amplitude of a sine wave corrupted by closely spaced sinusoidal interference with fast frequency variations is proposed. It is shown that the coefficients of the time-varying filter can be effectively determined using a Phase Locked Loop. It is proved that the performance of the proposed estimator depends neither on the interference level nor on the speed of frequency variations. Comparison with an adaptive estimator based on a linear time invariant filter shows the superiority of the proposed one where the interference frequency changes rapidly over time.

Original languageEnglish
Pages (from-to)183-194
Number of pages12
JournalSignal Processing
Volume21
Issue number2
DOIs
StatePublished - 1 Jan 1990
Externally publishedYes

Keywords

  • PLL
  • Time-varying filters
  • estimation

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Software
  • Signal Processing
  • Computer Vision and Pattern Recognition
  • Electrical and Electronic Engineering

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