System, method and apparatus for crosstalk cancellation

Details System, method and apparatus for crosstalk cancellation System, method and apparatus for crosstalk cancellation

2004-10-05

2009-08-04

Ghebretinsae, Temesghen (Department: 2611)

Pulse or digital communications

Transceivers

C375S222000, C370S201000, C370S286000, C455S063100

Reexamination Certificate

active

07570685

ABSTRACT:
The present invention effectively cancels echo, near-end crosstalk and far-end crosstalk. A FEXT canceller is placed at the transmitter rather than at the receiver according to an aspect of the invention. In some embodiment, a FEXT canceller can be placed at the receiver only or the combination of both ends. The FEXT canceller is continuously adapted with information sent back from a remote receiver and with data from a neighbor transmitter that causes the crosstalk at the remote receiver. This allows the FEXT canceller to quickly adapt to a change in crosstalk function or conditions with the surrounding environment, for example, aging, temperature, humidity, physical pressure, etc. In some embodiments, an adaptation control signal is sent back from the receiver to the transmitter by using an overhead bit in the frame format. In some embodiments, part of the FEXT canceller is built-in at the remote receiver.

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