Device and method for compensating crosstalk in transmission links
View Patent ↗In an embodiment, a method of compensating crosstalk on a plurality of transmission links is disclosed. The method includes providing first values depending on crosstalk among a plurality of transmission links. Each first value corresponds to one of a plurality of crosstalk channels, and each crosstalk channel represents signal transfer from one of the plurality of the transmission links to a different one of the plurality of transmission links. Second values specific to the transmission links are provided. A number of crosstalk channels are selected from a plurality of crosstalk channels interfering with signal transmission on transmissions links. The selecting depends on quotients of the first values and the second values.
1. A method comprising:
providing first values depending on crosstalk among a plurality of transmission links, each first value corresponding to one of a plurality of crosstalk channels, wherein each crosstalk channel represents a signal transfer from one of the plurality of the transmission links to a different one of the plurality of transmission links;
providing second values specific to the plurality of transmission links;
selecting a number of crosstalk channels from the plurality of crosstalk channels, wherein the selecting depends on a plurality of quotients, and wherein each quotient depends on one first value of the first values and one second value of the second values; and
compensating for crosstalk based on the selected crosstalk channels.
2. The method of claim 1 , wherein crosstalk compensation parameters are determined by using the selected crosstalk channels.
3. The method of claim 1 , wherein crosstalk precompensation parameters are determined by using the selected crosstalk channels.
4. The method of claim 1 , wherein the quotients are sorted in order of magnitude.
5. The method of claim 1 , wherein the crosstalk channels are selected corresponding to the quotients having the highest values.
6. The method of claim 1 , wherein the crosstalk channels are selected corresponding to the quotients exceeding a pre-determined threshold value.
7. The method of claim 1 , wherein a pre-determined number of the crosstalk channels are selected corresponding to the quotients having the highest values.
8. The method of claim 1 , wherein each of the second values corresponds to one of the transmission links and each of the second values depends on attenuation of the corresponding transmission link.
9. The method of claim 1 , wherein each of the first values corresponds to one of the crosstalk channels and each of the first values depends on a crosstalk transfer function of the corresponding crosstalk channel.
10. The method of claim 1 , wherein the method is repeated for several transmission frequencies.
11. The method of claim 1 , wherein crosstalk compensation or precompensation parameters are determined by using the selected crosstalk channels, the crosstalk compensation or precompensation parameters being used to mitigate effects of Frontend crosstalk.
12. The method of claim 1 , further comprising compensating the effect of crosstalk only on the selected number of crosstalk channels.
13. The method of claim 12 , wherein compensating the effect of crosstalk comprises performing precompensation, and wherein crosstalk precompensation parameters are determined by using the selected crosstalk channels.
14. The method of claim 1 , wherein the plurality of transmission links comprise wired transmission links.
15. The method of claim 1 , wherein each of the quotients is multiplied with a corresponding weighting factor that depends on a corresponding transmission link.
16. A computer running software for executing a method, the method comprising:
providing first values depending on crosstalk among a plurality of transmission links, each first value corresponding to one of a plurality of crosstalk channels, wherein each crosstalk channel represents signal transfer from one of the plurality of transmission links to a different one of the plurality of transmission links;
providing second values specific to the plurality of transmission links;
selecting a number of crosstalk channels from a plurality of crosstalk channels, wherein the selecting depends on a plurality of quotients, and wherein each quotient depends on one first value of the first values and on one second value of the second values; and
compensating for crosstalk based on the selected crosstalk channels.
17. A device, comprising:
a first determination circuit configured to determine first values depending on crosstalk among a plurality of transmission links;
a second determination circuit configured to determine second values specific to the plurality of the transmission links; and
a selection circuit configured to select a number of crosstalk channels from a plurality of crosstalk channels, wherein each crosstalk channel represents signal transfer from one of the plurality of the transmission links to a different one of the plurality of transmission links, wherein the selection circuit is configured to select the number of crosstalk channels depending on quotients, and wherein each quotient depends on one first value of the first values and on one second value of the second values.
18. The device of claim 17 , further comprising a crosstalk compensation circuit configured to only compensate crosstalk over the selected crosstalk channels.
19. The device of claim 17 , further comprising a crosstalk precompensation circuit configured to only precompensate crosstalk over the selected crosstalk channels.
20. The device of claim 17 , wherein the selection circuit selects those crosstalk channels corresponding to the quotients having the highest values.
21. The device of claim 17 , wherein each of the second values corresponds to one of the transmission links and each of the second values depends on attenuation of the corresponding transmission link.
22. The device of claim 17 , wherein each of the first values corresponds to one of the crosstalk channels and each of the first values depends on a crosstalk transfer function of the corresponding crosstalk channel.
23. The device of claim 18 , wherein the crosstalk compensation circuit mitigates effects of Frontend crosstalk.
24. The device of claim 19 , wherein the crosstalk precompensation circuit mitigates effects of Frontend crosstalk.
25. The device of claim 17 , wherein each of the quotients is multiplied with a corresponding weighting factor that depends on a corresponding transmission link.
26. A method comprising:
providing a crosstalk transfer function (Fext ji (k)) depending on crosstalk from an i th transmission link of the plurality of transmission links to a j th transmission link of the plurality of transmission links;
providing a transfer function (H i (k)) of the i th transmission link;
selecting a number of crosstalk channels from a plurality of crosstalk channels, wherein selecting the number of crosstalk channels comprises selecting the number of crosstalk channels according to the expression
Fext
ji
(
k
)
2
H
i
(
k
)
2
;
and
compensating for crosstalk based on the selected crosstalk channels.
27. The method of claim 26 , wherein selecting the number of crosstalk channels comprises selecting the number of crosstalk channels according to when the expression
Fext
ji
(
k
)
2
H
i
(
k
)
2
exceeds a predetermined threshold.
28. A device comprising:
a first determination circuit configured to determine a crosstalk transfer function (Fext ji (k)) depending on crosstalk between an i th transmission link of the plurality of transmission links to a j th transmission link of the plurality of transmission links;
a second determination circuit configured to determine a transfer function (H j (k)) of the i th transmission link; and
a selection circuit configured to select a number of crosstalk channels from a plurality of crosstalk channels, wherein each crosstalk channel is determined according to the expression
Fext
ji
(
k
)
2
H
i
(
k
)
2
.
29. The device of claim 28 , wherein the selection circuit is configured to select the number of crosstalk channels according to when the expression
Fext
ji
(
k
)
2
H
i
(
k
)
2
exceeds a predetermined threshold.