Frequency Domain Data Based Model Extraction for Band-Limited Digital Predistortion of Wideband RF Power Amplifiers

DOI number:10.1002/mmce.20783

Journal:Int'l Journal of RF and Microwave Computer-Aided Engineering

Key Words:digital predistortion; generalized least squares; model extraction; power amplifier.

Abstract:Bandwidth constraints pose significant challenges to linearization of wideband RF power amplifiers (PAs) with digital predistortion (DPD). A recently proposed band-limited DPD scheme uses a band-limited modeling technique to eliminate the bandwidth constraints and reduce DPD implementation cost. However, time consuming convolution operations are involved for model extraction in this time domain data based band-limited modeling method. In this article, band-limited model extraction is formulated as a generalized least squares problem and investigated from a frequency domain perspective. A frequency domain data based model extraction method is proposed, which greatly reduces the computational complexity for extracting band-limited DPD model parameters. A 10 W GaN HEMT inverse class-F PA excited by a 20 MHz four-carrier WCDMA signal and a 40 MHz two-carrier LTE signal is tested to validate the method. Experimental results show that the computationally efficient frequency domain data based model extraction method for band-limited DPD provides as good linearization performance as the time domain data based method.

First Author:Guang Yang (杨光)

Co-author:Caihong Zhao,Zhenyang Wang,Lingli Li,Haoyu Wang

Indexed by:Journal paper

Correspondence Author:Falin Liu

Discipline:Engineering

Document Type:J

Volume:24

Issue:3

Page Number:412-420

Translation or Not:no

Date of Publication:2014-05-01

Included Journals:SCI、EI