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 Adaptive pre-equalizer for use in data communications equipment

Details
Inventors: Herzberg, Hanan; Langberg, Ehud; Wang, Jin-Der; Werner, Jean-Jacques;
Assignee: Globespan Technologies, Inc. (Largo, FL)
Primary Examiner: Chin; Stephen
Assistant Examiner: Deppe; Betsy L.
Attorney, Agent or Firm: Thomas, Kayden, Horstemeyer & Risley

The problem of error propagation is resolved by using the communications channel to adapt a pre-equalizer of a transmitter, in response to changes in the communications channel. In particular, the pre-equalizer adapts to changes in the communications channel by processing an error signal that is communicated over a reverse channel by a corresponding receiver.

DETAILED DESCRIPTION In accordance with the invention, the foregoing error propagation problem is solved by using the communications channel to adapt a set of coefficients of a pre-equalizer of a transmitter.
In accordance with an embodiment of the invention, a transmitter includes a pre-equalizer.
The latter adapts to changes in the communications channel by using an error signal that is communicated over a reverse channel by a corresponding receiver.
As a result, no re-trains are required and the error signal typically requires less bandwidth than a set of coefficient values.


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