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An efficient combination of digital predistortion and OFDM clipping for power amplifiers
Author(s) -
Gilabert Pere L.,
Gadringer Michael E.,
Montoro Gabriel,
Mayer Markus L.,
Silveira Daniel D.,
Bertran Eduard,
Magerl Gottfried
Publication year - 2009
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.20381
Subject(s) - predistortion , linearizer , amplifier , electronic engineering , orthogonal frequency division multiplexing , clipping (morphology) , linearity , baseband , adjacent channel power ratio , nonlinear distortion , electrical efficiency , computer science , linearization , transmitter , intermodulation , power (physics) , rf power amplifier , electrical engineering , nonlinear system , engineering , telecommunications , cmos , channel (broadcasting) , physics , linguistics , philosophy , quantum mechanics
This article presents a strategy for enhancing efficiency in power amplifiers (PAs) by combining digital predistortion (DPD) linearization and clipping strategies for orthogonal frequency division multiplexing signals in a WiMAX scenario. On the one hand, by reducing the peak‐to‐average power ratio of multicarrier signals using the well‐known clipping technique, it is possible to perform a more efficient PA amplification. On the other hand, nonlinear and linear distortion introduced by the PA operating close to saturation is compensated by the baseband adaptive DPD linearizer. The DPD has to counteract not only the PA nonlinear behavior, but also its dynamics. A test‐bench implementing a WiMAX transmitter was deployed to evaluate the possibilities for enhancing power efficiency while fulfilling the demanded linearity requirements. Experimental results showing the power efficiency and linearity enhancement achieved by the proposed strategy are provided. © 2009 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2009.