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A digital predistorter for wireless transmitters

Bondar, Dmytro and Budimir, Djuradj (2009) A digital predistorter for wireless transmitters. International Journal of RF and Microwave Computer-Aided Engineering, 19 (4). pp. 453-459. ISSN 1096-4290

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Official URL: http://dx.doi.org/10.1002/mmce.20367

Abstract

A novel digital baseband predistorter with improved reduction of spectral regrowth is proposed and investigated. The improvements are achieved by using a proposed predistortion technique and extended power amplifier fundamental-frequency modelling. The digital baseband predistortion (DPD), known for its simplicity of realisation, low cost and integrability, however, suffers from poor linearizing performances. We incorporate baseband iterative injection of in-band distortion components into the baseband DPD in order to enhance the nonlinearity compensation. General formulas for the fundamental-frequency output of a power amplifier (PA) with n-order nonlinearity and recursive formulas for calculating the injected components for different number of iterations are developed. The proposed iterative digital baseband predistorter is verified experimentally with a wireless power amplifier and measured results are presented to demonstrate feasibility of the proposed concept. The spectral regrowth suppression of 20 dB is achieved for a 3.5 MHz digitally modulated signal.

Item Type:Article
Uncontrolled Keywords:Linearization, iterative digital baseband predistortion, in-band distortion modelling
Research Community:University of Westminster > Electronics and Computer Science, School of
ID Code:5262
Deposited On:24 Jun 2008 15:46
Last Modified:09 Jun 2009 12:20

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