Methods and systems for adaptive receiver equalization
View Patent ↗Methods and systems adaptively equalizing an analog information signal, the method including sampling the analog information signal to provide analog samples including post-transition samples and steady-state samples, and equalizing the analog samples to produce equalized analog samples. The equalizing includes determining a difference between an average post-transition amplitude associated with at least one of the post-transition samples and an average steady-state amplitude associated with at least one of the steady-state samples, and adjusting an equalization coefficient to adjust the difference between the average post-transition amplitude and the average steady-state amplitude.
1. A method for adaptively equalizing an analog information signal, the method comprising:
sampling the analog information signal to provide analog samples including post-transition samples and steady-state samples; and
equalizing the analog samples to produce equalized analog samples, the equalizing including:
determining a difference between an average post-transition amplitude associated with at least one of the post-transition samples and an average steady-state amplitude associated with at least one of the steady-state samples; and
adjusting an equalization coefficient to adjust the difference between the average post-transition amplitude and the average steady-state amplitude.
2. The method of claim 1 , further comprising:
integrating the post-transition samples, the average post-transition amplitude being associated with integrated post-transition samples; and
integrating the steady-state samples, the average steady-state amplitude being associated with integrated steady-state samples.
3. The method of claim 1 , further comprising:
accumulating the post-transition samples, the average post-transition amplitude being associated with accumulated post-transition samples; and
accumulating the steady-state samples, the average steady-state amplitude being associated with accumulated steady-state samples.
4. The method of claim 1 , wherein the adjusting includes adjusting the difference at a sub-sample rate relative to the sampling the analog information signal.
5. The method of claim 1 , wherein the adjusting includes adjusting the difference at an offset of a sub-sample rate relative to the sampling the analog information signal.
6. The method of claim 1 , wherein the adjusting includes minimizing the difference between the average post-transition amplitude and the average steady-state amplitude.
7. The method of claim 1 , wherein the equalizing includes minimizing inter-symbol interference among the analog samples.
8. The method of claim 1 , wherein the sampling includes sampling the analog information signal at a plurality of phases, the method further comprising:
measuring an equalization quality associated with a first phase from among the plurality of phases, wherein
the equalizing includes equalizing the analog samples based on the measured equalization quality.
9. The method of claim 1 , wherein a post-transition amplitude represents an amplitude of an equalized analog sample after transitioning from a first amplitude to a second amplitude and before settling to a steady-state value.
10. The method of claim 1 , further comprising:
quantizing the equalized analog samples to produce quantized samples;
comparing a multi-level representation of the equalized analog samples with the quantized samples;
performing a least-means-squared operation on a result of the comparing; and
adjusting the equalization coefficient based on a result of the least-means-squared operation.
11. A system, comprising:
a sampler configured to sample an analog information signal to provide analog samples including post-transition samples and steady-state samples; and
an equalizer configured to equalize analog samples to produce equalized analog samples, the equalizer being configured to:
determine a difference between an average post-transition amplitude associated with at least one of the post-transition samples and an average steady-state amplitude associated with at least one of the steady-state samples; and
adjust an equalization coefficient to adjust the difference between the average post-transition amplitude and the average steady-state amplitude.
12. The system of claim 11 , wherein the equalizer is further configured to:
integrate the post-transition samples, the average post-transition amplitude being associated with integrated post-transition samples; and
integrate the steady-state samples, the average steady-state sample amplitude being associated with integrated steady-state samples.
13. The system of claim 11 , wherein the equalizer is further configured to:
accumulate the post-transition samples, the average post-transition amplitude being associated with accumulated post-transition samples; and
accumulate the steady-state samples, the average steady-state sample amplitude being associated with accumulated steady-state samples.
14. The system of claim 11 , wherein the equalizer is configured to adjust the difference at a sub-sample rate relative to the sampling of the analog information signal.
15. The system of claim 11 , wherein the equalizer is configured to adjust the difference at an offset of a sub-sample rate relative to the sampling of the analog information signal.
16. The system of claim 11 , wherein, to adjust the difference, the equalizer is configured to minimize the difference between the average post-transition amplitude and the average steady-state amplitude.
17. The system of claim 11 , wherein the equalizer is configured to minimize inter-symbol interference among the analog samples.
18. The system of claim 11 , wherein the sampler is configured to sample the analog information signal at a plurality of phases, and wherein the equalizer is configured to measure an equalization quality associated with a first phase from among the plurality of phases, and to equalize the analog samples based on the measured equalization quality.
19. The system of claim 11 , wherein a post-transition amplitude represents an amplitude of an equalized analog sample after transitioning from a first amplitude to a second amplitude and before settling to a steady-state value.
20. The system of claim 11 , further comprising:
a quantizer configured to quantize the equalized analog samples to produce quantized samples;
a comparator configured to compare a multi-level representation of the equalized analog samples with the quantized samples;
a least-means-squared module configured to perform a least-means-squared operation on a result of the comparison, wherein the equalizer is configured to adjust the equalization coefficient based on the results of the least-means-squared operation.