IMPROVED CROSSTALK IDENTIFICATION FOR SPECTRUM MANAGEMENT IN BROADBAND TELECOMMUNICATIONS SYSTEMS

摘要

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.