H - Electricity – 03 – F
Patent
H - Electricity
03
F
H03F 1/32 (2006.01)
Patent
CA 2258604
A circuit (10) for predistorting a signal to be transmitted via a non-linear channel (18) comprises an envelope detector (24) for detecting an envelope of the signal (v). A quantization means (22) for forming quantized envelope values on the basis of the detected envelope is connected to the envelope detector (24) as well as to a table (16) for supplying complex predistortion coefficients which depend on said quantized envelope values and on a previously detected transmission function of the non-linear channel. An evaluation circuit (14) separated from said non-linear channel (18) and used for the complex evaluation of the signal (v) to be transmitted via the non-linear channel (18) with the complex predistortion coefficients permits the distortion introduced by the non-linear channel (18) to be substantially compensated according to amount and phase.
Un circuit (10) de prédistorsion d'un signal à transmettre via un chemin de transmission non linéaire (18) présente un circuit de détection (24) pour la détection d'une courbe d'enveloppe du signal (V). Un circuit de quantification (22) pour la formation de valeurs de courbe d'enveloppe quantifiées sur la base de la courbe d'enveloppe détectée est connecté au circuit de détection de courbe d'enveloppe (24), ainsi qu'à un tableau (16) fournissant les coefficients de prédistorsion complexes qui dépendent des valeurs de courbe d'enveloppe quantifiées et d'une fonction de transmission préalablement détectée du chemin de transmission non linéaire. Un circuit d'évaluation (14) séparé du chemin de transmission non linéaire (18) pour l'évaluation complexe du signal (v) à transmettre via le chemin de transmission non linéaire permet, avec les coefficients complexes de prédistorsion, que la distorsion introduite par le chemin de transmission non linéaire (18) soit sensiblement compensée en quantité et en phase.
Gerhauser Heinz
Perthold Rainer
Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung
Riches Mckenzie & Herbert Llp
LandOfFree
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