Method and device for data processing and communication system comprising such device

• US 8,908,489 B2
• Filed: 09/26/2008
• Issued: 12/09/2014
• Est. Priority Date: 09/26/2007
• Status: Active Grant

• Current Assignee: ADTRAN GmbH (ADTRAN Holdings, Inc.)
• Original Assignee: ADTRAN GmbH (ADTRAN Holdings, Inc.)
• Inventors: Haustein, Thomas
• Primary Examiner(s): WONG, XAVIER S
• Application Number:
  US12/680,267
• Publication Number:
  US 20100302929A1
• Time in Patent Office: 2,265 Days
• Field of Search: 370/201, 370/310, 370/332, 370/333
• US Class Current: 370/201
• CPC Class Codes: H04B 3/32 Reducing cross-talk, e.g. by compensating
• CPC Class Codes: H04L 2025/03414 Multicarrier
• CPC Class Codes: H04L 2025/03522 Frequency domain
• CPC Class Codes: H04L 25/03159 operating in the frequency domain H04L25/03165, H04L25/03178 take precedence

Abstract

Method and device for data processing and communication system with such a device. The method and the device allow data processing via at least one channel. The method includes the following step of transmitting an idle pattern across the at least one channel when no information is conveyed. The idle pattern is created such that interference and/or crosstalk resulting from the idle pattern can be reduced at the receiving side.

Claims

1. A method for data processing in a communication network via at least one channel connecting a central office with at least one transmitter and at least one customer premises equipment (CPE) with a receiver, comprising the steps of:

with all the transmitters;

conveying the same idle sequence to each respective receiver of an associated CPE that is in an idle state;

conducting interference and/or crosstalk suppression pre-coding for a CPE when user data needs to be conveyed to a respective receiver;

in each of the receiver;

conducting interference cancellation on the idle sequence using an interference filter;

decoding interference-cancelled data streams using a hard or soft decision de-mapper;

determining residual interference by subtracting signals output by the hard or soft decision de-mapper from a signal prior to such decision; and

utilizing the idle sequence to estimate a residual interference channel to update the interference cancellation filter.

2. The method according to claim 1, wherein the interference-cancelled data stream of the user is decoded in combination with a forward error correction code.

3. The method according to claim 1, wherein frequency interpolation techniques are used to reduce an estimation error.

4. The method according to claim 1, wherein the central office is a digital subscriber line multiplexer.

5. The method according to claim 1, wherein the interference cancellation is conducted using calculated weights utilizing a precise channel state information on the joint interference channel and appropriate weight.

6. The method according to claim 5, wherein frequency interpolation techniques are used to reduce an estimation error.

7. The method according to claim 5, wherein the central office is a digital subscriber line multiplexer.

8. The method according to claim 5, wherein the interference-cancelled data stream of the user is decoded in combination with a forward error correction code.

9. The method according to claim 8, wherein the central office is a digital subscriber line multiplexer.

10. The method according to claim 8, wherein frequency interpolation techniques are used to reduce an estimation error.

11. The method according to claim 10, wherein the central office is a digital subscriber line multiplexer.

12. A system for data processing including a central office with at least one transmitter and at least one customer premises equipment (CPE) with a receiver, the at least one transmitter and the at least one receiver being particularly configured to perform the steps of the method according to claim 1.

13. The system for data processing according to claim 12, wherein the interference cancellation is conducted using calculated weights utilizing a precise channel state information on the joint interference channel and appropriate weight.

14. The system for data processing according to claim 13, wherein the interference-cancelled data stream of the user is decoded in combination with a forward error correction code.

15. The system for data processing according to claim 14, wherein frequency interpolation techniques are used to reduce an estimation error.

16. The system for data processing according to claim 15, wherein the central office is a digital subscriber line multiplexer.

17. A customer premises equipment (CPE) for communicating with at least one central office including a transmitter, the CPE comprising:

a transmitter configured to;

transmit data; and

a receiver configured to;

conduct interference cancellation using an interference filter on an idle sequence transmitted from the central office when the CPE is in an idle state;

decode interference-cancelled data streams, pre-coded at the at least one central office, using a hard or soft decision de-mapper;

determine residual interference by subtracting signals output by the hard or soft decision de-mapper from a signal prior to such decision; and

utilize the idle sequence to estimate a residual interference channel to update the interference cancellation filter.