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,
Mutliple 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.
