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A Modified Viterbi Algorithm-Based IF Estimation Algorithm for Adaptive Directional Time–Frequency Distributions

  • Nabeel Ali Khan
  • Mokhtar Mohammadi
  • Igor Djurović
Article
  • 163 Downloads

Abstract

Time–frequency (TF)-based instantaneous frequency estimation algorithms fail to achieve the desired performance when the underlying TF distribution suffers from low resolution of the signal components or signal components intersect each other in the TF domain. This paper addresses above-mentioned problems by (a) employing adaptive directional time–frequency distributions for resolving close components and (b) developing a variant of the Viterbi algorithm that employs both the direction and amplitude of the signal components for IF estimation of crossing components at low signal-to-noise ratio. Experimental results indicate that the proposed method outperforms state-of-the-art methods such as original Viterbi-based IF estimation algorithm and ridge path regrouping methods.

Keywords

Instantaneous frequency estimation Adaptive time–frequency analysis Intersecting components Adaptive directional time–frequency distribution 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Nabeel Ali Khan
    • 1
  • Mokhtar Mohammadi
    • 2
  • Igor Djurović
    • 3
  1. 1.Electrical EngineeringFoundation UniversityIslamabadPakistan
  2. 2.Department of Computer ScienceUniversity of Human DevelopmentSulaymaniyahIraq
  3. 3.Electrical Engineering DepartmentUniversity of MontenegroPodgoricaMontenegro

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