Crosstalk identification for spectrum management in broadband telecommunications systems

US7738354B2 · kind B2 · utility

Inventors

• Robert Hausman · Bound Brook, US
• Stefano Galli · New York, US
• Kenneth J. Kerpez · Long Valley, US

Key dates

• Filing date: Dec 14, 2004
• Grant date: Jun 15, 2010
• Expiry date: Dec 11, 2028

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04M11/062
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

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 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) algorithm are used to increase the ability of the system and method to identify various crosstalk disturbers. The identification of the crosstalk disturber is then used to perform crosstalk cancellation and spectrum management in a DSL system.