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US 5,787,118 AGranted
Adaptive equalizer and adaptive diversity equalizer
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorKoji Ueda
Life of this patent
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Abstract
An adaptive equalizer which has a decision feedback adaptive equalizer unit 41, a linear adaptive equalizer unit 42, comparing circuit 47 which compares integrated equalizing error value of the decision feedback adaptive equalizer 41 with integrated estimation error value of the linear adaptive equalizer unit 42, and selecting circuit 48. The selecting circuit 48 selects one of the equalizer units 41 and 42, which has the better performance based on the result of the comparison of comparing circuit 47.
Claims11
An adaptive equalizer comprising:
- a decision feedback adaptive equalizer including an equalization filter part, a decision part having an input connected to the output of said equalization filter part and a tap-coefficient-update part which updates the tap coefficients of said equalization filter part in accordance with a tap-coefficient update algorithm, said equalization filter part having two linear transversal filters, that is, a feedforward filter and a feedback filter;
- a linear adaptive equalizaer including an equalization filter part having a linear transversal filter, a decision unit and a tap-coefficient-update part which updates tap coefficients of said equalization filter part in accordance with a tap-coefficient update algorithm;
- a comparator for comparing a value determined based on an estimation error produced from said decision feedback adaptive equalizer with a value determined based on an estimation error produced from said linear adaptive equalizer;
- and
- means for selecting one of an output produced from said decision feedback adaptive equalizer and the output produced from said linear adaptive equalizer based on the result of a comparison by said comparator and for setting said selected equalized output as the final output.
2 more elements
An adaptive equalizer comprising:
- a decision feedback adaptive equalizer receiving an input signal and producing a first equalized output;
- a linear adaptive equalizer receiving said input signal and producing a second equalized output;
- first error means for producing a first estimation error of said first equalized output;
- second error means for producing a second estimation error of said second equalized output;
- and
- selecting means for selecting one of said first and second equalized outputs based upon said first and second estimation errors.
3 more elements
Dependencies are inferred from the claim text.