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Écrêtage inversible pour l amplification non-linéaire des signaux ofdm
Paperback
Series: Omn.Univ.Europ.
Literary CriticismTechnology & Engineering
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ISBN10: 3841797040
ISBN13: 9783841797049
Publisher: Ed Universitaires Europeennes
Published: Feb 28 2018
Pages: 244
Weight: 0.80
Height: 0.55 Width: 6.00 Depth: 9.00
Language: French
ISBN13: 9783841797049
Publisher: Ed Universitaires Europeennes
Published: Feb 28 2018
Pages: 244
Weight: 0.80
Height: 0.55 Width: 6.00 Depth: 9.00
Language: French
L'OFDM garantit un compromis optimal entre la transmission haut débit et la robustesse vis-à-vis des canaux multitrajet avec évanouissement. Ce procédé de modulation présente des fortes fluctuations en amplitude avec un PAPR élevé qui oblige l'amplificateur de puissance (PA) à travailler loin de la saturation. Ainsi, le rendement du PA décroît avec l'augmentation de sa consommation. Pour la portabilité (ressource énergétique limitée), l'utilisation de modulations multiporteuses nécessite d'un traitement pour minimiser la consommation tout en gardant une bonne qualité du signal. La méthode de réduction du PAPR dite d'écrêtage plus filtrage a été améliorée en donnant lieu à la nouvelle méthode d'écrêtage inversible. Ce système se compose de l'écrêtage soft pour la réduction du PAPR, du filtrage pour une ACPR acceptable et de l'inversion pour compenser les distorsions. En présence du canal bruité, l'écrêtage inversible a un gain sur le rendement du PA. Ainsi le gain en consommation a été quantifié à 11% pour les mêmes performances en BER. En outre, une nouvelle définition de l'ACPR, le N_ACPR, permet de mieux prendre en compte la remontée des lobes secondaires du spectre de sortie
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