The use of Nonlinear Curvefitting in Digital Predistortion for Linearizing RF Power Amplifiers

Author

Wu, Shanying ; Hau, S. F Simon ; Wong, Y.M.

Author_Institution

Dept. of Electron. & Inf. Eng., Hong Kong Polytech. Univ.

fYear

0

fDate

0-0 0

Firstpage

960

Lastpage

963

Abstract

Nonlinearity has long been recognized as a problem endemic in power amplifiers (PA) with a high power. Digital predistortion (DPD) is one of most effective method to solve this problem. In this paper we used nonlinear curve-fitting to perform digital predistortion. We applied our technique to a RF power amplifier that nominally operates at 885 MHz with 30 watts output. When the IS95 standard test signal is applied to the power amplifier with its output power pushed to 45 watts, we found that nonlinearity of power amplifiers can be greatly improved (8 dB in ACLR) by our technique. Experimental results demonstrate the success and the feasibility of this method

Keywords

curve fitting; linearisation techniques; nonlinear distortion; power amplifiers; radiofrequency amplifiers; DPD; IS95 standard test signal; RF power amplifier linearization; digital predistortion; nonlinear curve-fitting; Baseband; Curve fitting; High power amplifiers; Power amplifiers; Power engineering and energy; Predistortion; Radio frequency; Radiofrequency amplifiers; Signal generators; Testing; Digital predistortion; curve-fitting; power amplifier;

fLanguage

English

Publisher

ieee

Conference_Titel

Information, Communications and Signal Processing, 2005 Fifth International Conference on

Conference_Location

Bangkok

Print_ISBN

0-7803-9283-3

Type

conf

DOI

10.1109/ICICS.2005.1689192

Filename

1689192