NDLI: Adaptive-order polynomial methods for power amplifier model estimation

Content Provider	IEEE Xplore Digital Library
Author	Dvorak, J. Marsalek, R. Blumenstein, J.
Copyright Year	2013
Description	Author affiliation: Dept. of Radio Electron., Brno Univ. of Technol., Brno, Czech Republic (Dvorak, J.; Marsalek, R.; Blumenstein, J.)
Abstract	Linearization techniques are required to reduce the undesirable effects of power amplifier nonlinearities in the wideband power-efficient radio communication systems. The polynomial model and its extension to the memory-polynomial are commonly used to model power amplifier nonlinearities. Determination of the appropriate order of the nonlinearity model is an actual issue to achieve effective methods for subsequent linearization techniques. Having in mind these facts, we compare two adaptive methods employing the determination of the appropriate order of the nonlinearity model. The first algorithm is the adaptive order recursive (ORLS) method, while the proposed solution is based on the recursive least squares method with the sequential updates. In the first stage the models were simulated in MATLAB. Depending on the mean square error estimate we decide on the appropriateness of the nonlinearity order increase. The parameters of the power amplifier models are based on the data experimentally obtained using the Universal Software Radio Peripheral (USRP) device with WBX front-end driven with an OFDM signal. After further performance evaluation, the order adaptation method will be used for efficient digital adaptive predistorter design.
Sponsorship	IEEE Czechoslovakia Sect.
Starting Page	389
Ending Page	392
File Size	1001088
Page Count	4
File Format	PDF
ISBN	9781467355162
e-ISBN	9781467355193
DOI	10.1109/RadioElek.2013.6530949
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-04-16
Publisher Place	Czech Republic
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Adaptation models power amplifier Computational modeling OFDM adaptive polynomial model Nonlinear distortion Power amplifiers Polynomials Mathematical model sequential least squares order recursive least squares
Content Type	Text
Resource Type	Article

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