A linearized Doherty amplifier using complex baseband digital predistortion driven by CDMA signals

Author

Hammi, Oualid ; Bousnina, Sami ; Ghannouchi, Fadhel M.

Author_Institution

Dept. of Electr. Eng., Ecole Polytech. de Montreal, Que., Canada

fYear

2004

fDate

19-22 Sept. 2004

Firstpage

435

Lastpage

438

Abstract

This work proposes a digitally linearized Doherty amplifier for CDMA applications. A fully digital complex baseband predistorter is used to improve the linearity of the amplifier over the whole input power range. This results in an improvement of the linearity of the Doherty amplifier without degrading its power efficiency. Experimental validation was carried on a designed 1-watt power Doherty amplifier operating at 1900 MHz. The performance of the linearized Doherty amplifier (LDA) was evaluated under a cdma2000 SRI signal. A power added efficiency of 50% was obtained with an ACPR level better than 35 dBc.

Keywords

3G mobile communication; UHF amplifiers; linearisation techniques; 1 W; 1900 MHz; 50 percent; SRI signal; cdma2000; complex baseband digital predistortion; digital complex baseband predistorter; digital linearization; linearized Doherty amplifier; performance evaluation; Baseband; Batteries; Circuit synthesis; High power amplifiers; Linearity; Linearization techniques; Multiaccess communication; Power amplifiers; Power generation; Predistortion;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio and Wireless Conference, 2004 IEEE

Print_ISBN

0-7803-8451-2

Type

conf

DOI

10.1109/RAWCON.2004.1389170

Filename

1389170