Apparatus and Method to Allow a Frame Check Sequence to Determine the Updating of Adaptive Receiver Parameters of a High Speed Communication Device

Abstract

A DSL device performs a frame check sequence operation in a digital signal processor (DSP), i.e., layer one of the OSI seven layer model, heretofore performed only in layer two of the OSI seven layer model. Performing the layer two framing and calculating the frame check sequence in the DSP allows the DSP to use the layer two error detection results, and optionally, the mean squared error vector, to more accurately determine whether to update adaptive receiver parameters.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional of prior application Ser. No. 09 / 716,787, filed Nov. 20, 2000, which is a continuation of U.S. Pat. No. 6,272,108, issued Aug. 7, 2001, which claims priority to provisional application Ser. No. 60 / 036,006, filed Mar. 5, 1997, all of which are incorporated herein by reference.FIELD OF THE INVENTION [0002] The present invention relates generally to data communications, and more particularly, to a method and apparatus to determine the updating of a high speed communication device's adaptive receiver parameters. BACKGROUND OF THE INVENTION [0003] The field of data communications typically uses modems, or communication devices, to convey information from one location to another. Digital Subscriber Line (DSL) technology now enables communications devices to communicate large amounts of data. This communication scheme adheres generally to a model, known as the Open Systems Interconnect (OSI) Seven-Layer model. ...

AI Technical Summary

Benefits of technology

[0024] An advantage of the present invention is that it allows a communication device (or a DSP in a communication device) to perform OSI layer two frame check sequencing and error correction. This results in an increased level of error detection because the DSP now has access to the layer two error correction framing information in addition to the mean-square-error vector of the equalizer.

[0025] Another advantage of the present invention is that it provides a more robust, better performing technique for updating the adaptive receiver parameters.

[0026] Another advantage of the present invention is that it allows the equalizer filter taps to adjust gracefully to changing line conditions.

[0027] Another advantage of the present invention is that it allows for error correction in an uncoded modulation environment.

[0028] Another advantage of the present invention is that it is simple in design, reliable in operation, and its design lends itself to economical mass production in DSL devices.

Problems solved by technology

Various channel conditions may cause the modem's equalizer to track inappropriately.

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