Compensation for interference in data receivers
View Patent ↗A data communication receiver comprises an equalizer for adapting to each of a plurality of channels to open the eye for each channel in a Gigabit (1000BASE-T) transceiver. The eye is open for a first channel (A) and a transformation process applies the coefficients of that adaptation to open the eye for the other dimensions. The transformation process keeps the magnitude response constant.
1. An equalizer for a data communication receiver, the equalizer comprising means for adapting to each of a plurality of channels to open the eye for each channel, said equalizer including means for opening the eye for a first channel, and for applying coefficients adapted from said first channel to open the eye of at least one subsequent channel.
2. An equalizer as claimed in claim 1 , wherein the equalizer comprises means for applying the coefficients via a transformation process.
3. An equalizer as claimed in claim 2 , wherein the equalizer comprises means for keeping the magnitude response substantially constant during transformation.
4. An equalizer as claimed in claim 2 , wherein the equalizer includes compensation means for allowing a plurality of phase delays to be applied during transformation.
5. An equalizer as claimed in claim 2 , wherein the equalizer comprises means for performing the transformation according to an interpolation function.
6. An equalizer as claimed in claim 5 , wherein the function is a linear interpolation function.
7. An equalizer as claimed in claim 2 , wherein the equalizer comprises means for modifying the group delay through a filter during transformation.
8. An equalizer as claimed in claim 7 , wherein the group delay is modified by a fraction of a symbol period.
9. An equalizer as claimed in claim 1 , wherein the equalizer comprises means for opening the eye of a channel transmitting independently identically distributed (IID) symbols and for applying coefficients adapted from said first channel to open the eye of at least one non-IID channel.
10. A 1000BASE-T transceiver comprising an equalizer as claimed in claim 1 .
11. An equalizer for a data communication receiver, the equalizer comprising a circuit for adapting to each of a plurality of channels to open the eye for each channel, said circuit configured to open the eye for a first channel, generating transformed coefficients, and to apply the transformed coefficients to open the eye of at least one subsequent channel.
12. The equalizer as claimed in claim 11 , wherein the equalizer is configured to keep the magnitude response substantially constant during transformation.
13. The equalizer as claimed in claim 11 , wherein the equalizer is configured to compensate for a plurality of phase delays during transformation.
14. The equalizer as claimed in claim 11 , wherein the equalizer is configured to perform the transformation according to an interpolation function.
15. The equalizer as claimed in claim 14 , wherein the function is a linear interpolation function.
16. The equalizer as claimed in claim 11 , wherein the equalizer is configured to modify the group delay through a filter during transformation.
17. The equalizer as claimed in claim 16 , wherein the group delay is modified by a fraction of a symbol period.
18. The equalizer as claimed in claim 11 , wherein the equalizer is configured to open the eye of a channel transmitting independently identically distributed (IID) symbols and to apply the transformed coefficients to open the eye of at least one non-IID channel.
19. A 1000BASE-T transceiver comprising an equalizer as claimed in claim 11 .