Device and method for predistorting a transmission signal to...

H - Electricity – 03 – F

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H03F 1/32 (2006.01) H03F 3/24 (2006.01) H04L 27/26 (2006.01) H04L 27/36 (2006.01)

Patent

CA 2374318

A device for predistorting a transmission signal (S1) to be transmitted over a nonlinear transmission path (10) comprises an estimator (14, 16) for determining an error signal (S2') depending on the transmission signal (S1) and a previously registered transfer characteristic of the nonlinear transmis- sion path (10). The error signal (S2') represents an estimate of an error generated due to the nonlinearity of the trans- mission path (10). A time-dispersive element (18) is provided to produce a correction signal (S3) by a temporal extension of the error signal (S2'). A combiner (20) is provided to combine the transmission signal (S1) and the correction sig- nal (S3). As a result of the temporal extension of the error signal (S2'), an error signal segment in the frequency spec- trum of a transmission signal (S4) transmitted by the nonlin- ear transmission path (10) is shifted away from the useful frequency range of the transmission signal.

L'invention concerne un dispositif pour effectuer une prédistorsion d'un signal de transmission (S1) à transmettre sur une ligne de transmission non linéaire (10). Ce dispositif présente une unité d'estimation (14, 16) servant à déterminer un signal d'erreur (S2') en fonction du signal de transmission (S1) et d'une caractéristique de transmission, déterminée au préalable, de la ligne de transmission non linéaire (10). Ce signal d'erreur (S2') représente une estimation d'une erreur générée par la non linéarité de la ligne de transmission (10). Un élément de dispersion temporelle (18) sert à produire un signal de correction (S3) par élargissement temporel du signal d'erreur (S2'). Une unité de combinaison (20) sert à combiner le signal de transmission (S1) et le signal de correction (S3). L'élargissement temporel du signal d'erreur (S2') a pour effet d'éloigner une partie du signal d'erreur, dans le spectre de fréquence d'un signal de transmission (S4) transmis par la ligne de transmission non linéaire (10), de la gamme de fréquence utile du signal de transmission.

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