Crosstalk identification in xDSL systems

Details Crosstalk identification in xDSL systems Crosstalk identification in xDSL systems

2006-01-24

2006-01-24

Tran, Sinh (Department: 2644)

Telephonic communications

Transmission line conditioning

Interference suppression

C370S201000

Reexamination Certificate

active

06990196

ABSTRACT:
Methods, apparatus and systems for identifying crosstalk interference in xDSL systems are disclosed and are useful in a variety of xDSL systems to assist in the provisioning, maintenance and diagnosis of the xDSL system and in spectral management and assignments. Signal data are collected from a receiver, a primary transmitter and any crosstalk transmitters. The signal data are resampled, if necessary. A first estimate of the timing offset between the received signal and each crosstalk signal is then obtained by cross-correlating the received data with the transmitted crosstalk data. The first timing offset estimate is then used in connection with a least-squares estimation of the crosstalk response for the considered crosstalk data and a second estimate of the timing offset. The invention may be used at a third party site remote from the system transmitters and receivers. The crosstalk identification of the present invention can be used in dynamic spectrum management for DSL services and signals.

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