Power amplifiers linearization based on digital predistortion with memory effects used in CDMA applications

P. Varahram, S. S. Jamuar, S. Mohammady, M. N. Hamidon, S. Khatun

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Digital predistortion of a baseband signal is a well-known method of power amplifier (PA) linearization used to reduce adjacent channel interference (ACI) in a non constant envelope modulation system. This paper discusses the application of adaptive digital baseband predistortion linearization to radio frequency (RF) power amplifiers (PAs) that exhibit memory effects. This technique is a highly costeffective way to linearize Power amplifiers (PAs), but most existing architectures assume that the PA has a memoryless nonlinearity. For wider bandwidth applications such as wideband code-division multiple access (WCDMA) or wideband orthogonal frequency-division multiplexing (WOFDM), PA memory effects can no longer be ignored. In this paper a new technique for adaptation of digital predistorter that considers memory effects in power amplifiers is proposed. This method is a combination of two techniques, memory polynomial predistortion and slope-dependent method. This new technique is validated by using a 1.9 GHz 60W LDMOS power amplifier and various signals such as 2-carrier CDMA and 3-carrier CDMA.

Original languageEnglish
Title of host publicationEuropean Conference on Circuit Theory and Design 2007, ECCTD 2007
PublisherIEEE Computer Society
Pages488-491
Number of pages4
ISBN (Print)1424413427, 9781424413423
DOIs
Publication statusPublished - 2007
Externally publishedYes
EventEuropean Conference on Circuit Theory and Design 2007, ECCTD 2007 - Seville, Spain
Duration: 26 Aug 200730 Aug 2007

Publication series

NameEuropean Conference on Circuit Theory and Design 2007, ECCTD 2007

Conference

ConferenceEuropean Conference on Circuit Theory and Design 2007, ECCTD 2007
Country/TerritorySpain
CitySeville
Period26/08/0730/08/07

Keywords

  • ACPR
  • CDMA
  • Memory effect
  • Power amplifier
  • Predistortion

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