H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 3/32 (2006.01) H04B 3/46 (2006.01)
Patent
CA 2363502
In a transmission system which makes use of frequency translated signals, said system having a plurality of lines, a method for reducing crosstalk induced on a signal on a first line of said plurality of lines by a signal on a second line of said plurality of lines, comprising estimating a complex coupling factor for the crosstalk, which when multiplied by the signal on the second line estimates the induced crosstalk, and subtracting the estimated induced crosstalk from the signal on the first line. The invention comprises an approximation method for multiplying the complex coupling factor by the signal on the second line that operates on the signal on the second line through pre- rotation, scaling and multiplication by a complex number according to the coupling factor, said complex number being chosen from a bank of predetermined complex numbers so as to obtain the best approximation possible.
L'invention concerne un système de transmission utilisant des signaux transposés en fréquence, ledit système possédant plusieurs lignes, et un procédé permettant d'atténuer les perturbations diaphoniques provoquées sur un signal d'une première ligne par un signal d'une seconde ligne. Ce procédé consiste à estimer un coefficient de couplage complexe pour les perturbations diaphoniques qui, lorsque multiplié par le signal de la seconde ligne, permet d'estimer les perturbations diaphoniques induites, le procédé consistant ensuite à soustraire les perturbations diaphoniques estimées induites par le signal de la première ligne. L'invention concerne également un procédé d'approximation consistant à multiplier le coefficient de couplage complexe par le signal de la seconde ligne agissant sur le signal de la seconde ligne par pré-rotation, normalisation et multiplication par un nombre complexe fonction du coefficient de couplage, ce nombre complexe étant choisi dans une banque de nombres complexes prédéterminés de manière à obtenir la meilleure approximation possible.
Hjelm Mikael
Karlsson Rudberg Mikael
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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