Adjusted Transmission in XDSL

1. A method, in a transmitting node connected to a respective first end of a first digital subscriber line and a second digital subscriber line, a second end of the first digital subscriber line being connected to a first receiving node, the method comprising: transmitting a first signal (A 1 ) on the first digital subscriber line; transmitting a second signal (A 2 ) on the second digital subscriber line, the second signal being related to the first signal; adjusting the transmitting of the second signal on the second digital subscriber line such that a contribution from the second signal interferes constructively with a signal (A 1 ′) at the second end of the first digital subscriber line, where the signal A 1 ′ represents the first signal A 1 having propagated through the first digital subscriber line.

2. The method of claim 1 , wherein the contribution from the second signal is crosstalk, related to the second signal, from the second digital subscriber line to the first digital subscriber line.

3. The method of claim 1 , wherein the adjusting the transmitting of the second signal is performed by use of precoding.

4. The method of claim 1 , wherein the first signal and the second signal at least partly comprise the same information.

5. The method of claim 1 : wherein the second signal is transmitted using at least one sub-carrier on the second digital subscriber line; wherein the contribution from the second signal interferes constructively with the signal on a corresponding at least one sub-carrier on the first digital subscriber line.

6. The method of claim 1 , wherein a second end of the second digital subscriber line is not connected to the first receiving node.

7. The method of claim 1 , wherein a second end of the second digital subscriber line is connected to a second receiving node.

8. The method of claim 1 , wherein the adjusting the transmitting of the second signal is based on at least one of: feedback received from the first receiving node; upstream communication from the first receiving node.

9. The method of claim 1 , further comprising cancelling crosstalk to the first digital subscriber line from communication on a third line connected to the transmitting node.

10. The method of claim 9 , wherein the crosstalk is cancelled by use of vectoring.

11. A transmitting node for digital subscriber lines, connectable to a respective first end of at least a first digital subscriber line and a second digital subscriber line, the transmitting node comprising: a transmitting circuit configured to: transmit a first signal (A 1 ) on the first digital subscriber line; transmit a second signal (A 2 ) on the second digital subscriber line, the second signal being related to the first signal; an adjusting circuit configured to adjust the transmission of the second signal on the second digital subscriber line such that a contribution from the second signal interferes constructively with a signal (A 1 ′) at the second end of the first digital subscriber line, where the signal A 1 ′ represents the first signal A 1 having propagated through the first digital subscriber line.

12. The transmitting node of claim 11 , where the contribution from the second signal is crosstalk, related to the second signal, from the second digital subscriber line to the first digital subscriber line.

13. The transmitting node of claim 11 , wherein the transmitting circuit is configured to transmit the second signal on at least one sub-carrier on the second digital subscriber line.

14. The transmitting node of claim 11 , wherein the adjusting circuit is configured to base the adjustment of the transmission of the second signal on at least one of: feedback received from a first receiving node connected to the second end of the first digital subscriber line; upstream communication from a first receiving node connected to the second end of the first digital subscriber line.

15. The transmitting node of claim 11 , wherein the adjusting circuit is configured to function as precoder.

16. The transmitting node of claim 11 , wherein the transmitting node is configured to cancel crosstalk to the first digital subscriber line from communication on a third line connected to the transmitting node.

17. The transmitting node of claim 16 , wherein the transmitting node is configured to cancel the crosstalk by use of vectoring.