Title :
Efficient baseband/RF feedforward linearizer through a mirror power amplifier using software-defined radio and quadrature digital up-conversion
Author :
Jeckeln, E.G. ; Ghannouchi, F.M. ; Sawan, M. ; Beauregard, F.
Author_Institution :
Dept. of Electr. & Comput. Eng., Ecole Polytech. de Montreal, Que., Canada
Abstract :
This paper describes an efficient feedforward linearizer suitable for base station 3G power amplifiers based on and using both software-defined radio and quadrature digital up-conversion technologies. The linearizer accomplishes the extraction of the PA complex nonlinear behavior in real time and performs a numerical quasi-perfect carrier´s cancellation that allows the reduction of the power rating of the error amplifier (EA) and eliminates the requirement for any output delay line. This enhances the overall power efficiency of the feedforward amplifier. The entire system is validated using DSP/RF co-simulation for the LDMOS model of a typical 44 dBm class AB power amplifier (PA/sub AB/) as the main amplifier.
Keywords :
feedforward; linearisation techniques; power amplifiers; radio equipment; radiofrequency amplifiers; DSP/RF co-simulation; LDMOS model; base station 3G power amplifier; baseband/RF feedforward linearizer; carrier cancellation; class AB power amplifier; error amplifier; mirror power amplifier; nonlinearity; power efficiency; quadrature digital up-conversion; software defined radio; Baseband; Delay lines; Digital signal processing; Feedforward systems; Linearity; Mirrors; Power amplifiers; Radio frequency; Radio transmitters; Radiofrequency amplifiers;
Conference_Titel :
Microwave Symposium Digest, 2001 IEEE MTT-S International
Conference_Location :
Phoenix, AZ, USA
Print_ISBN :
0-7803-6538-0
DOI :
10.1109/MWSYM.2001.967010
