Linearization of Wideband RF Doherty Power Amplifiers with Complex Dynamic Nonlinearities

Taijun Liu; Yan Ye; Zhiwe Fan; Xingbin Zeng; Fadhel M. Fadhel

ChinaCom2008-Wireless Communications and Networking Symposium

Research Article

Linearization of Wideband RF Doherty Power Amplifiers with Complex Dynamic Nonlinearities

Cite: BibTeX Plain Text

@INPROCEEDINGS{10.1109/CHINACOM.2008.4685186,
    author={Taijun Liu and Yan Ye and Zhiwe Fan and Xingbin Zeng and Fadhel M. Fadhel},
    title={Linearization of Wideband RF Doherty Power Amplifiers with Complex Dynamic Nonlinearities},
    proceedings={ChinaCom2008-Wireless Communications and Networking Symposium},
    publisher={IEEE},
    proceedings_a={CHINACOM2008-WCN},
    year={2008},
    month={11},
    keywords={Memory effects; Doherty power amplifiers; linearization; memory polynomial},
    doi={10.1109/CHINACOM.2008.4685186}
}

Taijun Liu
Yan Ye
Zhiwe Fan
Xingbin Zeng
Fadhel M. Fadhel
Year: 2008
Linearization of Wideband RF Doherty Power Amplifiers with Complex Dynamic Nonlinearities
CHINACOM2008-WCN
IEEE
DOI: 10.1109/CHINACOM.2008.4685186

Taijun Liu, Yan Ye¹^,*, Zhiwe Fan¹^,*, Xingbin Zeng¹^,*, Fadhel M. Fadhel²^,*

1: Engineering Research Center of Multimedia Communication, Ministry of Education Ningbo University, Ningbo, P.R. China
2: Department of Electrical and Computer Engineering University of Calgary Calgary, Canada

*Contact email: liutaijun@nbu.edu.c, liutaijun@nbu.edu.c, liutaijun@nbu.edu.c, fghannou@ucalgary.c

Abstract

In this paper, a traditional look-up-table (LUT) predistorter and a memory polynomial predistorter are applied to a LDMOS Doherty power amplifier to pre-compensate its nonlinearities so as to make its linearity be able to satisfy the requirements of a wideband wireless communication system. The experimental validation results reveal that the widely used memory polynomial cannot effectively suppress the out-of-band spectrum regrowth caused by the complex dynamic nonlinearity of this Doherty power amplifier. In fact, the traditional memoryless LUT predistorter provides unexpected better linearization performance than the memory polynomial predistorter.

Keywords: Memory effects; Doherty power amplifiers; linearization; memory polynomial

Published: 2008-11-21
Publisher: IEEE
Modified: 2010-05-16

: http://dx.doi.org/10.1109/CHINACOM.2008.4685186