Convergence speed, lowering the excess noise and power consumption of equalizers
First Claim
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1. A receiver, comprising:
- a demodulator;
a decision feedback equalizer coupled to the demodulator, the decision feedback equalizer comprising;
a first digital filter having a plurality of first filter sections, each of the plurality of first filter sections with an independently controllable first parameter controlled by a corresponding one of a plurality of first control sections, each first filter sections having a plurality of first taps having first tap coefficients; and
a second digital filter.
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Abstract
An equalizer for equalizing channel multi-path distortion includes digital filters. To improve the convergence speed and tracking ability of the equalizer while lowering noise and power consumption, the digital filters are divided into sections. Various parameters of the sections, such as step-size, shutdown and update rates can be controlled. Control of the various parameters can be realized either in software on an embedded or external processor or by dedicated hardware.
121 Citations
36 Claims
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1. A receiver, comprising:
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a demodulator;
a decision feedback equalizer coupled to the demodulator, the decision feedback equalizer comprising;
a first digital filter having a plurality of first filter sections, each of the plurality of first filter sections with an independently controllable first parameter controlled by a corresponding one of a plurality of first control sections, each first filter sections having a plurality of first taps having first tap coefficients; and
a second digital filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A decision feedback equalizer, comprising:
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a first digital filter having a plurality of first filter sections, each of the plurality of first filter sections with an independently controllable first parameter controlled by a corresponding one of a plurality of first control sections, each first filter sections having a plurality of first taps having first tap coefficients; and
a second digital filter. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 26, 28, 30, 31, 32, 33, 34, 35, 36)
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23. A method for updating tap coefficients of a plurality of filter sections of a decision feedback equalizer (DFE), comprising the steps of:
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(1) receiving digital signals;
(2) ascertaining whether a particular intersymbol interference (ISI) within the digital signals exists in the plurality of filter sections; and
(3) disabling one of the plurality of filter sections if the particular ISI does not exist in one of the plurality of filter sections.
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25. A method for improving convergence speed, reducing excess noise and power consumption of a decision feedback equalizer (DFE) including a plurality of filter sections, comprising the steps of:
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(1) receiving digital signals;
(2) executing a least mean square (LMS) algorithm;
(3) ascertaining whether a particular ISI within the digital signals exists in one of the plurality of filter sections; and
(4) revising the update rate of the LMS algorithm for one of the plurality of filter sections depending upon the presence of the particular ISI associated with one of the plurality of filter sections.
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27. A method for improving convergence speed, reducing excess noise and power of a decision feedback equalizer (DFE) including a plurality of filter sections, comprising the steps of:
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(1) receiving digital signals;
(2) executing a least mean square (LMS) algorithm;
(3) ascertaining whether a particular ISI within the digital signals exists in one of the plurality of filter sections; and
(4) revising a step-size of the LMS algorithm for one of the plurality of filter sections depending upon the presence of the particular ISI associated with one of the plurality of filter sections.
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29. An apparatus for receiving terrestrial data, comprising:
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a receiver, including;
a demodulator;
a decision feedback equalizer coupled to the demodulator, the decision feedback equalizer comprising;
a first digital filter having a plurality of first filter sections, each of the plurality of first filter sections with an independently controllable first parameter controlled by a corresponding one of a plurality of first control sections, each first filter sections having a plurality of first taps having first tap coefficients; and
a second digital filter; and
an antenna coupled to the receiver.
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Specification