Complex gain and fixed-point digital predistorters for CDMA power amplifiers

Author

Wustenberg, John W. ; Xing, Helen J. ; Cruz, J.R.

Volume

53

Issue

2

fYear

2004

fDate

3/1/2004 12:00:00 AM

Firstpage

469

Lastpage

478

Abstract

Two digital baseband predistortion techniques, one based on the complex gain digital predistorter (CGDP) approach and the other based on the fixed-point predistorter (FPPD) approach, are used to compensate a nonlinear high-power amplifier (HPA) in an IS-2000 system. Forward-link performance for a perfectly linear HPA, nonlinear HPA, and compensated HPA using both a CGDP and an FPPD are compared using an IS-2000 forward-link simulator. Both predistortion techniques are shown to provide similar forward-link performance and reduction in spectral regrowth of the sidebands for the wide-band compensated HPAs utilized by IS-2000 systems.

Keywords

UHF power amplifiers; cellular radio; code division multiple access; nonlinear distortion; CDMA systems; IS-2000 system; cellular systems; code division multiple access; complex gain digital predistorter; digital baseband predistortion techniques; fixed-point predistorter; forward-link simulator; nonlinear high-power amplifier; spectral regrowth reduction; wide-band compensated amplifier; Amplitude modulation; Baseband; Digital modulation; High power amplifiers; Multiaccess communication; Phase modulation; Power amplifiers; Predistortion; Quadrature amplitude modulation; Wideband;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/TVT.2004.823547

Filename

1275711