Table of Contents
International Journal of Microwave Science and Technology
Volume 2011 (2011), Article ID 468497, 5 pages
http://dx.doi.org/10.1155/2011/468497
Research Article

A Two-Step Identification Approach for Twin-Box Models of RF Power Amplifier

1Department of Engineering Physics, Tsinghua University, Beijing 100084, China
2Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900, China

Received 21 April 2011; Revised 11 July 2011; Accepted 19 July 2011

Academic Editor: Paolo Colantonio

Copyright © 2011 You-Jiang Liu et al. 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.

Abstract

We propose a two-step identification approach for twin-box model (Wiener or Hammerstein) of RF power amplifier. The linear filter block and the static nonlinearity block are extracted, respectively, based on least-squares method, by iterative calculation. Simulations show that the method can get quite accurate parameters to model different nonlinear models with memory such as Wiener, Hammerstein, Wiener-Hammerstein (W-H), and memory polynomial models, hence, demonstrating its robustness. Furthermore, experimental results show excellent agreement between measured output and modeled output, where one carrier WCDMA signal is used as the excitation for a wideband RF amplifier.