The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Les signaux de multiplexage par répartition orthogonale de la fréquence (OFDM) ont un rapport puissance crête/puissance (PAPR) élevé et provoquent d'importantes distorsions non linéaires dans les amplificateurs de puissance (PA). Les effets de mémoire dans les AP ne deviennent également plus négligeables pour la large bande passante des signaux OFDM. La prédistorsion numérique en bande de base est une technique très efficace pour compenser les distorsions non linéaires. Mais il comporte généralement de nombreux paramètres et met beaucoup de temps à converger. Cet article présente une nouvelle conception de prédistorsion utilisant un ensemble de polynômes orthogonaux pour augmenter la vitesse de convergence et la qualité de la compensation. Étant donné que les signaux OFDM ont une distribution gaussienne approximativement complexe, les polynômes Hermite complexes qui ont une expression de forme fermée peuvent être utilisés comme un ensemble de polynômes orthogonaux pour les signaux OFDM. Un modèle d'enveloppe différentielle est adopté dans la conception du prédistorsion pour compenser les AP non linéaires avec des effets de mémoire. Ce modèle est supérieur aux autres modèles de prédistorsion en termes de nombre de paramètres à calculer. Nous inspectons les performances du prédistorsion proposé en utilisant un signal OFDM référencé à la norme WLAN IEEE 802.11a. Les résultats de simulation montrent que le prédistorseur proposé est efficace pour compenser les PA mémoire. Il est également démontré que la proposition acquiert une vitesse de convergence plus rapide et un meilleur effet de compensation que les prédistorsions conventionnelles.
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Yitao ZHANG, Kiyomichi ARAKI, "A Novel Predistorter Design for Nonlinear Power Amplifier with Memory Effects in OFDM Communication Systems Using Orthogonal Polynomials" in IEICE TRANSACTIONS on Electronics,
vol. E93-C, no. 7, pp. 983-990, July 2010, doi: 10.1587/transele.E93.C.983.
Abstract: Orthogonal frequency division multiplexing (OFDM) signals have high peak-to-average power ratio (PAPR) and cause large nonlinear distortions in power amplifiers (PAs). Memory effects in PAs also become no longer ignorable for the wide bandwidth of OFDM signals. Digital baseband predistorter is a highly efficient technique to compensate the nonlinear distortions. But it usually has many parameters and takes long time to converge. This paper presents a novel predistorter design using a set of orthogonal polynomials to increase the convergence speed and the compensation quality. Because OFDM signals are approximately complex Gaussian distributed, the complex Hermite polynomials which have a closed-form expression can be used as a set of orthogonal polynomials for OFDM signals. A differential envelope model is adopted in the predistorter design to compensate nonlinear PAs with memory effects. This model is superior to other predistorter models in parameter number to calculate. We inspect the proposed predistorter performance by using an OFDM signal referred to the IEEE 802.11a WLAN standard. Simulation results show that the proposed predistorter is efficient in compensating memory PAs. It is also demonstrated that the proposal acquires a faster convergence speed and a better compensation effect than conventional predistorters.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/transele.E93.C.983/_p
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@ARTICLE{e93-c_7_983,
author={Yitao ZHANG, Kiyomichi ARAKI, },
journal={IEICE TRANSACTIONS on Electronics},
title={A Novel Predistorter Design for Nonlinear Power Amplifier with Memory Effects in OFDM Communication Systems Using Orthogonal Polynomials},
year={2010},
volume={E93-C},
number={7},
pages={983-990},
abstract={Orthogonal frequency division multiplexing (OFDM) signals have high peak-to-average power ratio (PAPR) and cause large nonlinear distortions in power amplifiers (PAs). Memory effects in PAs also become no longer ignorable for the wide bandwidth of OFDM signals. Digital baseband predistorter is a highly efficient technique to compensate the nonlinear distortions. But it usually has many parameters and takes long time to converge. This paper presents a novel predistorter design using a set of orthogonal polynomials to increase the convergence speed and the compensation quality. Because OFDM signals are approximately complex Gaussian distributed, the complex Hermite polynomials which have a closed-form expression can be used as a set of orthogonal polynomials for OFDM signals. A differential envelope model is adopted in the predistorter design to compensate nonlinear PAs with memory effects. This model is superior to other predistorter models in parameter number to calculate. We inspect the proposed predistorter performance by using an OFDM signal referred to the IEEE 802.11a WLAN standard. Simulation results show that the proposed predistorter is efficient in compensating memory PAs. It is also demonstrated that the proposal acquires a faster convergence speed and a better compensation effect than conventional predistorters.},
keywords={},
doi={10.1587/transele.E93.C.983},
ISSN={1745-1353},
month={July},}
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TY - JOUR
TI - A Novel Predistorter Design for Nonlinear Power Amplifier with Memory Effects in OFDM Communication Systems Using Orthogonal Polynomials
T2 - IEICE TRANSACTIONS on Electronics
SP - 983
EP - 990
AU - Yitao ZHANG
AU - Kiyomichi ARAKI
PY - 2010
DO - 10.1587/transele.E93.C.983
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E93-C
IS - 7
JA - IEICE TRANSACTIONS on Electronics
Y1 - July 2010
AB - Orthogonal frequency division multiplexing (OFDM) signals have high peak-to-average power ratio (PAPR) and cause large nonlinear distortions in power amplifiers (PAs). Memory effects in PAs also become no longer ignorable for the wide bandwidth of OFDM signals. Digital baseband predistorter is a highly efficient technique to compensate the nonlinear distortions. But it usually has many parameters and takes long time to converge. This paper presents a novel predistorter design using a set of orthogonal polynomials to increase the convergence speed and the compensation quality. Because OFDM signals are approximately complex Gaussian distributed, the complex Hermite polynomials which have a closed-form expression can be used as a set of orthogonal polynomials for OFDM signals. A differential envelope model is adopted in the predistorter design to compensate nonlinear PAs with memory effects. This model is superior to other predistorter models in parameter number to calculate. We inspect the proposed predistorter performance by using an OFDM signal referred to the IEEE 802.11a WLAN standard. Simulation results show that the proposed predistorter is efficient in compensating memory PAs. It is also demonstrated that the proposal acquires a faster convergence speed and a better compensation effect than conventional predistorters.
ER -