Adjusted transmission in XDSL

Patent metadata

Field	Value
Publication number	US-9270333-B2
Application number	US-201114239875-A
Country	US
Kind code	B2
Filing date	Aug 24, 2011
Priority date	Aug 24, 2011
Publication date	Feb 23, 2016
Grant date	Feb 23, 2016

Abstract

Method and transmitting node for adjusting transmission over xDSL lines connected to the transmitting node. The method involves transmitting ( 1006 ) a first signal A 1 on a first line ( 304 ), and transmitting ( 1008 ) a second signal A 2 on a second line ( 306 ), the second signal A 2 being related to the first signal A 1 . The method further involves adjusting ( 1010 ) the transmission of the second signal A 2 on the second line ( 306 ), such that a contribution from the second signal A 2 interferes constructively with a signal A 1 ′ at the second end ( 304:2 ) of the first line ( 304 ), where the signal A 1 ′ represents the signal A 1 having propagated through the first line.

First claim

The invention claimed is:

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.

Assignees

• Lu Chenguang
• Johansson Albin
• Berg Miguel
• Eriksson Per-Erik
• Ericsson Telefon Ab L M

Inventors

• Lu Chenguang
• Johansson Albin
• Berg Miguel
• Eriksson Per-Erik

Classifications

• H04B3/32 Primary

  Reducing cross-talk, e.g. by compensating · CPC title

• H04J1/12

  Arrangements for reducing cross-talk between channels {(in line transmission systems H04B3/32; in cables or lines H04B3/26 - H04B3/30)} · CPC title

• H04J3/10

  Arrangements for reducing cross-talk between channels · CPC title

• H04L5/0062

  Avoidance of ingress interference, e.g. ham radio channels · CPC title

• H04L25/03343

  Arrangements at the transmitter end · CPC title