NDLI: Spline-Based Model for Digital Predistortion of Wide-Band Signals for High Power Amplifier Linearization

Content Provider	IEEE Xplore Digital Library
Author	Safari, N. Fedorenko, P. Kenney, J.S. Roste, T.
Copyright Year	2007
Description	Author affiliation: NTNU, Trondheim (Safari, N.)
Abstract	Different linearization techniques have been proposed to linearize Power Amplifiers (PAs) and improve the PA efficiency for non-constant envelope modulation schemes. Among all the linearization techniques, Digital Predistortion (DPD) is one of the most cost effective. For wider bandwidth applications, PA memory effects can no longer be ignored. Therefore in order to achieve a higher linearization performance, the Predistorter (PD) requires to compensate for memory nonlinearities. In this paper a new PD model based on piecewise polynomial approximation in the form of splines is described and compared with memory polynomial PD. The purpose of the spline PD is to increase the approximation accuracy and/or reduce the complexity. Simulation results with 16 Quadrature Amplitude Modulation (QAM) show a significant improvement in Adjacent Channel Power Ratio (ACPR) for a Wiener-Hammerstein power amplifier model. A set-up to perform the measurements on a 100 watt High Power Amplifier (HPA) is also developed. The experiments are carried out on both an uplink WCDMA and a crest-reduced two-carrier WCDMA signal. The results show that a higher linearization performance is obtained by using spline basis functions as compared to conventional memory polynomial PD.
Starting Page	1441
Ending Page	1444
File Size	2644469
Page Count	4
File Format	PDF
ISBN	1424406870
ISSN	0149645X
DOI	10.1109/MWSYM.2007.380504
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spline Predistortion High power amplifiers Polynomials Linearization techniques Power amplifiers Quadrature amplitude modulation Multiaccess communication Broadband amplifiers Costs spline approximation Power amplifier linearization digital predistortion memory effects
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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