Publication Journal: International Journal of RF and Microwave Computer-Aided Engineering (RFMiCAE)

Title: Behavioral Modeling for Concurrent Dual-band Power Amplifiers Using 2D Hammerstein/Wiener Models

Authors: You-Jiang Liu,Wenhua Chen,Jie Zhou,Bang-Hua Zhou,F. M. Ghannouchi

Author Affiliations: 1. Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900, China; 2.Department of Engineering Physics, Tsinghua University, Beijing 100084, China; 3.Department of Electronic Engineering, Tsinghua University, Beijing 100084, China; 4. Intelligent RF Radio Laboratory (iRadio Lab), Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada T2N 1N4.

Status: Accepted in 2012, to be published in 2013

Abstract: Behavioral modeling for the concurrent dual-band power amplifier (PA) is a critical problem in practical applications. The nonlinear distortion in the concurrent dual-band PA is quite different from that in the conventional single-band PA. This paper analyzes the nonlinearities in the concurrent dual-band PA and reveals that both input signals in the dual bands are important for the behavioral modeling. The 2D Hammerstein model and 2D Wiener model are proposed for the first time for the concurrent dual-band PA. They are extended versions of conventional Hammerstein and Wiener structures used in the single-band PA by including the cross-band intermodulation in the static nonlinearity block. The proposed 2D models require much less coefficients than the original work of the 2D-DPD model. Experiments were carried out for an 880 MHz / 1960 MHz concurrent dual-band Doherty PA to demonstrate the effectiveness of the proposed models. The results clearly show that less than -40 dB normalized mean square errors (NMSEs) are obtained in the dual bands in the behavioral modeling.

Email: liuyj04@163.com