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Modeling of wideband radio frequency power amplifiers using Zernike polynomials
Author(s) -
Jebali C.,
Boulejfen N.,
Rawat M.,
Gharsallah A.,
Ghannouchi F. M.
Publication year - 2012
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.20575
Subject(s) - wideband , amplifier , nonlinear system , radio frequency , zernike polynomials , instability , signal (programming language) , volterra series , polynomial , power (physics) , computer science , electronic engineering , algorithm , set (abstract data type) , mathematics , telecommunications , engineering , physics , mathematical analysis , optics , bandwidth (computing) , quantum mechanics , wavefront , mechanics , programming language
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.