Linearization of an Outphasing Amplifier for Wide-band Multi-carrier Signals

Author

Finnerty, Keith ; Wesson, Robin ; Dooley, John ; Acar, Mustafa ; van der Heijden, Mark P. ; Farrell, Ronan

Author_Institution

Dept. of Electron. Eng., Nat. Inst. of Ireland, Maynooth, Ireland

Volume

25

Issue

2

fYear

2015

fDate

Feb. 2015

Firstpage

139

Lastpage

141

Abstract

A novel method using self-organizing maps to determine the optimum ranges to partition the vector switched Volterra series is presented. Analyzing characteristics of the input signal it is possible to separate different regions of operation. Partitioning of the correction algorithm provides the ability to target regions of different non-linear behavior with separate coefficients. This work is validated with experimentally measured results and shows an adjacent channel power ratio (ACPR) of -49/-50 dBc achieved for a four carrier Wideband Code-Division Multiple Access (WCDMA) signal using a 19 watt digital outphasing amplifier from NXP.

Keywords

Volterra series; electronic engineering computing; linearisation techniques; power amplifiers; self-organising feature maps; signal processing; wideband amplifiers; ACPR; WCDMA signal; adjacent channel power ratio; carrier wideband code-division multiple access signal; correction algorithm; digital outphasing amplifier linearization; input signal analyzing characteristics; nonlinear behavior; power 19 W; power amplifier; self-organizing maps; vector switched Volterra series partition; wideband multicarrier signals; Bandwidth; Clustering algorithms; Neurons; Predistortion; Robustness; Training; Vectors; Linear amplification with non-linear Components (LINC); linearization; outphasing amplifier; predistortion;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2014.2382653

Filename

7005491