Adaptive baseband digital predistorter suitable for wideband signals

Author

Hammi, Oualid ; Boumaiza, Slim ; Jaïdane-Saïdane, Meriem ; Ghannouchi, Fadhel M.

Author_Institution

Dept. of Electr. Eng., Ecole Polytechnique, Montreal, Que., Canada

fYear

2002

fDate

11-13 Dec. 2002

Firstpage

131

Lastpage

134

Abstract

In this paper, we present a new topology for an adaptive baseband digital predistorter suitable for wideband signals. The proposed predistorter is composed of a cascade of a fixed LUT based predistorter and an adaptive linear subband filter´s bank. The linear subband filters serve to compensate for the dependency of the RF power amplifier behavior on the temperature. In this work, measured AM/AM and AM/PM characteristics of an LDMOS class A/B amplifier were used for the predistorter performances evaluation purposes. The simulation results using a CDMA2000 signal show a good performance in terms of the out of band emission reduction of the amplifier output spectrum.

Keywords

adaptive signal processing; power amplifiers; table lookup; AM/AM characteristic; AM/PM characteristic; LDMOS class AB amplifier; LUT based predistorter; RF power amplifier; adaptive baseband digital predistorter; adaptive linear subband filters bank; amplifier output spectrum; lookup table; out of band emission reduction; wideband signal; Baseband; Broadband amplifiers; Filter bank; Nonlinear filters; Power amplifiers; Radio frequency; Radiofrequency amplifiers; Table lookup; Topology; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Microelectronics, The 14th International Conference on 2002 - ICM

Print_ISBN

0-7803-7573-4

Type

conf

DOI

10.1109/ICM-02.2002.1161513

Filename

1161513