Equalization system and method thereof
AssigneeMediatek Inc.
InventorsWei-Ting Wang, Ming-Luen Liou
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Abstract
An equalization system used in a communication receiver has multiple equalization stages. A front equalizer supplies equalization output to a feed back filter in a rear equalizer to speed initialization of the rear equalizer. In addition, the rear equalizer supplies decision output to the front equalizer to estimate errors so as to provide more accurate tap coefficient adjustments. Both the front equalizer and the rear equalizer can be implemented with iterative equalizers to further enhance equalization performance.
Claims20
A method for performing equalization in a communication receiver, comprising:
- generating a decision output from a rear equalizer of the communication receiver;
- estimating an estimated error by comparing the decision output of the rear equalizer and equalization output of a front equalizer of the communication receiver;
- and
- adjusting the front equalizer according to the estimated error, wherein the communication receiver has more than two equalizer stages, and the front equalizer is at an earlier stage than the rear equalizer.
A method for performing equalization in a communication receiver, comprising:
- generating an equalization output from a front equalizer of the communication receiver;
- supplying the equalization output to a feedback filter of a rear equalizer of the communication receiver for initialization;
- and
- performing equalization in the rear equalizer by the initialized feedback filter of the rear equalizer, wherein the communication receiver has more than two equalizer stages, and the front equalizer is at an earlier stage than the rear equalizer.
An equalization system used in a communication receiver, comprising:
- a front equalizer comprising a first feed forward filter, a first feedback filter, a first combiner and a first decision unit, wherein the first combiner combines output of the first feed forward filter and the first feedback filter to generate first equalization output;
- the first decision unit decides first set of discrete values based on the first equalization output;
- and the first equalization output are supplied to the first feedback filter;
- a rear equalizer comprising a second feed forward filter, a second feedback filter, a second combiner and a second decision unit, wherein the second combiner combines output of the second feed forward filter and the second feedback filter to generate second equalization output;
- the second decision unit decides second set of discrete values based on the second equalization output;
- and the second equalization output are supplied to the second feedback filter;
- an error estimator receiving the second set of discrete values and the first equalization output to obtain an estimated error;
- and
- a tap coefficient unit for adjusting tap coefficients of at least one of the first feed forward filter and the first feedback filter, wherein the front equalizer is at an earlier stage than the rear equalizer in multiple equalizer stages of the communication receiver.
An equalization system used in a communication receiver, comprising:
- a front equalizer comprising a first feed forward filter, a first feedback filter, a first combiner and a first decision unit, wherein the first combiner combines output of the first feed forward filter and the first feedback filter to generate first equalization output;
- the first decision unit decides first set of discrete values based on the first equalization output;
- and the first equalization output are supplied to the first feedback filter;
- a rear equalizer comprising a second feed forward filter, a second feedback filter, a second combiner and a second decision unit, wherein the second combiner combines output of the second feed forward filter and the second feedback filter to generate second equalization output;
- the second decision unit decides second set of discrete values based on the second equalization output;
- and the second equalization output are supplied to the second feedback filter;
- and wherein the first equalization output are supplied to the second feedback filter for initialization.
Dependencies are inferred from the claim text.