US 6,445,734 B1 · System and method of validating equalizer training

Abstract

Equalizer training is validated by techniques to detect false training. The validation techniques involve checking the unique time domain energy shaping of a plurality of taps of a trained equalizer of a modem for good training. The energy measure for each equalizer tap of the plurality of taps is approximated by summing the magnitude of a real component and a magnitude of an imaginary component of an equalizer coefficient corresponding to the equalizer tap. A tap with a highest approximate energy (i.e., the main tap) is then determined. Next, the main tap energy is compared to a main tap threshold and a predetermined guarding threshold. The plurality of taps are arranged in a time index ordered sequence. In determining the main tap threshold, a first energy sum of a beginning set of taps in the sequence is compared with a second energy sum of a last set of taps in the sequence. The lesser tap energy sum between the first energy sum and the second energy sum is the main tap threshold. The main tap is then compared with the main tap threshold and the predetermined guarding threshold. If the main tap is greater than the main tap threshold and the predetermined guarding threshold, then the train of the equalizer is good. If the main tap is less than the main tap threshold or the predetermined guarding threshold, then the train of the equalizer is false. The above-mentioned validation techniques are effective to recognize the unique time domain energy shaping characteristics of good-trained equalizer taps.

Claims21

Dependent claims

A modem configured to validate equalizer training, comprising:

a host controller;
and
a data pump coupled to the host controller, the data pump comprising:
an equalizer;
and
a memory device coupled to the equalizer, the memory device comprising:
equalizer training validation code executable by the data pump, the code comprising:
energy measurement code to approximately measure the energy for each tap of a plurality of taps for the equalizer;
main tap detection code to detect a main tap with a highest approximate energy, the plurality of taps including the main tap;
main tap threshold calculation code to calculate a main tap threshold;
main tap threshold analysis code to compare the main tap threshold with a predetermined guarding threshold;
and
main tap compare code to compare the main tap threshold and the main tap if the main tap threshold is greater than the predetermined guarding threshold and to compare the predetermined guarding threshold and the main tap if the main tap threshold is less than the predetermined guarding threshold.

10 more elements

An integrated circuit, comprising:

a memory device executable by a data pump, comprising:
equalizer training validation code, comprising:
energy measurement code to approximately measure the energy for each tap of a plurality of taps for the equalizer;
main tap detection code to detect a main tap with a highest approximate energy, the plurality of taps including the main tap;
main tap threshold calculation code to calculate a main tap threshold;
and
main tap threshold analysis code to compare the main tap threshold with a predetermined guarding threshold;
and
main tap compare code to compare the main tap threshold and the main tap if the main tap threshold is greater than the predetermined guarding threshold and to compare the predetermined guarding threshold and the main tap if the main tap threshold is less than the predetermined guarding threshold.

6 more elements

A processor readable medium, comprising:

equalizer training validation code, comprising:
energy measurement code to approximately measure the energy for each tap of a select plurality of taps for the equalizer;
main tap detection code to detect a main tap with a highest approximate energy, the select plurality of taps including the main tap;
main tap threshold calculation code to calculate a main tap threshold;
main tap threshold analysis code to compare the main tap threshold with a predetermined guarding threshold;
and
main tap compare code to compare the main tap threshold and the main tap if the main tap threshold is greater than the predetermined guarding threshold and to compare the predetermined guarding threshold and the main tap if the main tap threshold is less than the predetermined guarding threshold.

4 more elements

Dependencies are inferred from the claim text.

System and method of validating equalizer training

Life of this patent

System and method of validating equalizer training

Life of this patent

Abstract

Claims21