Distortion improvement of power amplifiers with digital predistortion

Author

Bondar, D. ; Budimir, D.

Author_Institution

Wireless Commun. Res. Group, Univ. of Westminster, London, UK

fYear

2009

fDate

20-21 April 2009

Firstpage

1

Lastpage

2

Abstract

This paper presents an optimized digital predistortion (DPD) technique based on iterative injecting of distortion components into the baseband signal. The ratio of computation complexity to linearization degree can be regulated by choosing the appropriate number of injections. The proposed DPD technique allows achieving a significant increase in linearization degree and overcoming the distortion compensation limit. Experimental results for a 21-dB gain GaAs power amplifier fed with a 5-MHz digitally modulated signal show significant improvement in spectral regrowth.

Keywords

HF amplifiers; III-V semiconductors; distortion; gallium arsenide; iterative methods; linearisation techniques; power amplifiers; DPD technique; GaAs; computation complexity; digital predistortion; digital-modulated signal; frequency 5 MHz; gain 21 dB; iterative injection; linearization degree; power amplifier; Baseband; Digital modulation; Frequency; Linearization techniques; Nonlinear distortion; Phase distortion; Polynomials; Power amplifiers; Predistortion; Signal generators;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless and Microwave Technology Conference, 2009. WAMICON '09. IEEE 10th Annual

Conference_Location

Clearwater, FL

Print_ISBN

978-1-4244-4564-6

Electronic_ISBN

978-1-4244-4565-3

Type

conf

DOI

10.1109/WAMICON.2009.5207287

Filename

5207287