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A Complexity-Reduced ML Parametric Signal Reconstruction Method

  • Z. Deprem
  • K. Leblebicioglu
  • O. Arıkan
  • A. E. Çetin
Open Access
Research Article
  • 672 Downloads

Abstract

The problem of component estimation from a multicomponent signal in additive white Gaussian noise is considered. A parametric ML approach, where all components are represented as a multiplication of a polynomial amplitude and polynomial phase term, is used. The formulated optimization problem is solved via nonlinear iterative techniques and the amplitude and phase parameters for all components are reconstructed. The initial amplitude and the phase parameters are obtained via time-frequency techniques. An alternative method, which iterates amplitude and phase parameters separately, is proposed. The proposed method reduces the computational complexity and convergence time significantly. Furthermore, by using the proposed method together with Expectation Maximization (EM) approach, better reconstruction error level is obtained at low SNR. Though the proposed method reduces the computations significantly, it does not guarantee global optimum. As is known, these types of non-linear optimization algorithms converge to local minimum and do not guarantee global optimum. The global optimum is initialization dependent.

Keywords

Global Optimum Expectation Maximization Additive White Gaussian Noise Reconstruction Error Convergence Time 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Z. Deprem et al. 2011

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Authors and Affiliations

  • Z. Deprem
    • 1
  • K. Leblebicioglu
    • 2
  • O. Arıkan
    • 1
  • A. E. Çetin
    • 1
  1. 1.Department of Electrical and Electronics EngineeringBilkent UniversityBilkent, AnkaraTurkey
  2. 2.Department of Electrical and Electronics EngineeringMiddle East Technical UniversityAnkaraTurkey

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