H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 5/16 (2006.01) H04J 99/00 (2009.01) H04B 3/46 (2006.01) H04B 17/00 (2006.01) H04L 1/24 (2006.01) H04M 1/24 (2006.01) H04M 11/00 (2006.01)
Patent
CA 2430566
Crosstalk between subscriber loops to transmit different broadcast services through the same bundled telephone cable is a significant limitation to providing digital subscriber line services. A method for estimating the crosstalk (300), 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 with a "basis set" of received crosstalk PSDs (330, 340) which consists 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. This information can be used to perform crosstalk cancellation and spectrum management for DSL systems.
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 (300), 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 >= dedensités de puissance spectrales (PSD) diaphoniques (330, 340) 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. On peut utiliser ces informations pour supprimer la diaphonie et gérer le spectre pour des systèmes DSL.
Kerpez Kenneth
Valenti Craig F.
Kirby Eades Gale Baker
Telcordia Technologies Inc.
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