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Multiplexer-related

Apparatus-and-method-for-a-reduced-component-equalizer-circuit

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Apparatus and method for a reduced component equalizer circuit

Details

Inventors: Gatherer, Alan; Tran, Hiep Van;
Assignee: Texas Instruments Incorporated (Dallas, TX)
Primary Examiner: Ghebretinsae; Temesghen
Assistant Examiner:
Attorney, Agent or Firm: Moore; J. Dennis, Brady, III; W. James, Telecky, Jr.; Frederick J.

In an equalizer filter unit, the filter is divided into a plurality of sequential segments. While all the components of the equalizer unit multiply data signal groups by the a coefficient signal group, in only one segment are the coefficient signal groups updated. The data and the coefficient signal groups are periodically transferred to the next sequential filter segment while the filter segments are reconfigured in the original sequential order. In this manner, the each data signal group interacts with a coefficient signal group in the original sequential order. Because the coefficients are updated in only one of the filter segments, the amount of apparatus required for processing signal groups is reduced.

DETAILED DESCRIPTION The aforementioned and other features are accomplished, according to the present invention, by providing an equalizer unit or adaptive filter unit in which the unit, having N components, is divided into M segments.
Of the M segments, only one segment has apparatus for up-dating the coefficients of each equalizer component within the segment.
The equalizer unit further includes apparatus for cyclically transferring the data and the coefficient signal groups from one segment to the next consecutive segment.
In addition, reconfiguration apparatus couples the segments in such a manner that the data continues to be transferred through the segments of the equalizer unit in the sequence established during an initialization of equalizer unit operation.
The equalizer unit therefore reduces the apparatus used in the updating of the coefficients by a factor of approximately 1/M.
However, by periodically cycling the coefficients through the equalizer unit, all the coefficients of the equalizer unit will be updated, but the coefficients will be updated approximately 1/N times as often as in the equalizer unit with a coefficient update unit for every component.
These and other features of the present invention will be understood upon the reading of the following description in conjunction with the Figures.

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