Modeling of wideband radio frequency power amplifiers using Zernike polynomials

  • Authors:

  • C. Jebali;N. Boulejfen;M. Rawat;A. Gharsallah;F. M. Ghannouchi

  • Affiliations:

  • Departement de Physique, Faculté des Sciences, Université El Manar, Tunis 2092, Tunisie;Electrical and Computer Engineering Department, Office: ICT 336, Schulich School of Engineering, The University of Calgary, 2500 University Dr., NW Calgary, AB, Canada T2N 1N4;Electrical and Computer Engineering Department, Office: ICT 336, Schulich School of Engineering, The University of Calgary, 2500 University Dr., NW Calgary, AB, Canada T2N 1N4;Departement de Physique, Faculté des Sciences, Université El Manar, Tunis 2092, Tunisie;Electrical and Computer Engineering Department, Office: ICT 336, Schulich School of Engineering, The University of Calgary, 2500 University Dr., NW Calgary, AB, Canada T2N 1N4

  • Venue:
  • International Journal of RF and Microwave Computer-Aided Engineering
  • Year:
  • 2012

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Abstract

In this article, we suggest a new set of basis functions that are based on Zernike polynomials for the behavioral modeling of radio frequency power amplifiers (PAs). The modeling of highly nonlinear PAs exhibits numerical instability that degrades the accuracy of the model parameters and predistorter modeling efficiency. Simulation results show that the proposed polynomial model is more suitable to resolve the numerical instability problem and proves to have greater accuracy with reduced complexity. A Doherty PA driven by a multicarrier wideband code division multiple access signal was used for validation; and, the obtained results show that the new model exhibits superior numerical stability as the nonlinearity order and memory depth of the model increase. © 2012 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2012. © 2012 Wiley Periodicals, Inc.