Telephonic communications – Transmission line conditioning – Interference suppression
Reexamination Certificate
2005-04-26
2005-04-26
Isen, Forester W. (Department: 2644)
Telephonic communications
Transmission line conditioning
Interference suppression
C379S416000, C370S201000
Reexamination Certificate
active
06885746
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, 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.
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Galli Stefano
Hausman Robert
Kerpez Kenneth
Giordano Joseph
Isen Forester W.
Schoneman William A.
Singh Ramnandan
Telecordia Technologies, Inc.
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