Title :
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
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;
Conference_Titel :
Radio and Wireless Conference, 2004 IEEE
Print_ISBN :
0-7803-8451-2
DOI :
10.1109/RAWCON.2004.1389170
