H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 1/00 (2006.01) H04J 99/00 (2009.01) H04B 3/23 (2006.01) H04B 15/00 (2006.01) H04B 17/00 (2006.01) H04J 1/12 (2006.01) H04J 3/10 (2006.01) H04L 5/16 (2006.01) H04M 1/24 (2006.01) H04M 3/08 (2006.01) H04M 3/22 (2006.01) H04M 9/00 (2006.01) H04M 11/00 (2006.01) H04M 11/06 (2006.01)
Patent
CA 2454239
Crosstalk between subscriber loops used to transmit different broadband services through the same bundled telephone cable is a significant limitation to providing digital subscriber line services. A method for estimating the crosstalk, identifying the sources of the crosstalk and predicting additional sources of crosstalk are disclosed. The crosstalk sources are identified in the frequency domain by maximizing the correlation (530) with a "basis set" of received crosstalk PSDs which consist of the cascade of a finite set of known transmit PSDs types times a representative set of crosstalk couplings. Multiple crosstalk types are identified with a technique of successive spectral subtraction. Once a type is identified the crosstalk disturber is compared against all other members of the complete set for that type. Additionally, Multiple Regression (MR) techniques and a Matching Pursuit (MP) alogrithm 535) are used to increase the ability of the system and method to identify various crosstalk disturbers.
La diaphonie entre les lignes d'abonnés utilisées pour transmettre différents services de diffusion via le même câble téléphonique en faisceau constitue une entrave importante à la fourniture des services de lignes d'abonnés numériques. L'invention concerne un procédé d'évaluation de la diaphonie, d'identification des sources de diaphonie et de prévision d'autres sources de diaphonie. On identifie les sources de diaphonie dans le domaine fréquentiel en maximisant la corrélation par un ensemble de base de densités de puissance spectrales (PSD) diaphoniques reçues, comprenant la cascade d'un ensemble fini de types de PSD de transmission connus multiplié par un ensemble représentatif des couplages diaphoniques. De nombreux types de diaphonies sont identifiés par une technique de soustraction spectrale successive. Une fois qu'on a identifié un type, on compare le perturbateur diaphonique à tous les autres éléments de l'ensemble complet dudit type. On peut, en outre, utiliser des techniques de régression multiple (MR) et un algorithme (535) de poursuite de correspondance (MP) pour augmenter l'aptitude du système et du procédé à identifier des perturbateurs diaphoniques variés.
Galli Stefano
Hausman Robert
Kerpez Kenneth
Kirby Eades Gale Baker
Telcordia Technologies Inc.
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