Power amplifier linearization with adaptive predistorter for stable IMD characteristics

Author

Kim, Jin Young ; Kim, Jong Heon

Author_Institution

Dept. of Radio Sci. & Eng., Kwangwoon Univ., Seoul, South Korea

Volume

3

fYear

2004

fDate

2-6 Nov. 2004

Firstpage

2071

Abstract

In this paper, an adaptive predistortion linearizer is proposed and fabricated for a power amplifier implementation. In order to compensate for intermodulation distortion (IMD) drift of the predistorted power amplifier, an adaptive algorithm based on the LMS (least mean square) criterion is proposed. Improvement of 12.67 dB in 2-fone test and adjacent channel power ratio (ACPR) reduction of 6 dB is achieved for the IS-95 CDMA cellular system by applying the adaptive predistorter to power amplifier with an average power of 16 W. From the experimental results, the ACPR characteristics is maintained within a constant value less than -45 dBc when the outside temperature changes from -10 °C to 50 °C.

Keywords

adaptive control; cellular radio; code division multiple access; intermodulation distortion; least mean squares methods; linearisation techniques; power amplifiers; radiofrequency amplifiers; IMD drift; IS-95 CDMA cellular system; RF amplifier; adaptive predistorter; adjacent channel power ratio; intermodulation distortion; least mean square criterion; linearization; power amplifier; stable IMD characteristic; Adaptive algorithm; Attenuators; Linearization techniques; Nonlinear distortion; Power amplifiers; Predistortion; RF signals; Radio frequency; Radiofrequency amplifiers; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics Society, 2004. IECON 2004. 30th Annual Conference of IEEE

Print_ISBN

0-7803-8730-9

Type

conf

DOI

10.1109/IECON.2004.1432115

Filename

1432115