Accurate Linearization with Low-Complexity Models Using Cascaded Digital Predistortion Systems

Author

Barradas, Filipe M. ; Nunes, Luis C. ; Pedro, Jose C. ; Cunha, Telmo R. ; Lavrador, Pedro M. ; Cabral, Pedro M.

Author_Institution

DETI, Univ. de Aveiro, Aveiro, Portugal

Volume

16

Issue

1

fYear

2015

fDate

Feb. 2015

Firstpage

94

Lastpage

103

Abstract

Power efficiency is one of the main concerns in modern radio frequency (RF) power amplifier (PA) design. However, efficiency-driven designs typically impose operation of these devices in a compressed mode [1]. When operating in this region, the amplifiers will behave nonlinearly and produce a distorted output signal [1]. This distortion produces new spectral components at the PAs\´ output that are outside the bandwidth of the input signal, so the distorted output signal has a wider bandwidth than the input signal. This bandwidth enlargement effect, called "spectral regrowth," is undesired in RF transmitters due to wireless systems\´ spectral mask regulations [2].

Keywords

integrated circuit design; linearisation techniques; radiofrequency power amplifiers; RF power amplifier; RF transmitters; accurate linearization; bandwidth enlargement effect; cascaded digital predistortion systems; low-complexity models; modern radio frequency power amplifier design; power efficiency; spectral mask regulations; spectral regrowth; Bandwidth; Gain; Nonlinear distortion; Peak to average power ratio; Predistortion; Semiconductor device measurement;

fLanguage

English

Journal_Title

Microwave Magazine, IEEE

Publisher

ieee

ISSN

1527-3342

Type

jour

DOI

10.1109/MMM.2014.2367864

Filename

7010423