Method and system for channel equalization and crosstalk estimation in a multicarrier data transmission system

• US 7,801,233 B1
• Filed: 06/18/2009
• Issued: 09/21/2010
• Est. Priority Date: 01/06/2005
• Status: Expired due to Fees

• Current Assignee: Marvell World Trade Limited (Marvell Technology Group Limited)
• Original Assignee: Marvell World Trade Limited (Marvell Technology Group Limited)
• Inventors: Leung, Pak Hei Matthew, Fung, Tin-Yau, Ng, Francis Man-Lung, Tang, Eugene Yuk-Yin, Luk, King-Fuk, Chow, Jacky S.
• Primary Examiner(s): Tran; Khai
• Application Number:
  US12/487,527
• Time in Patent Office: 460 Days
• Field of Search: 375/260, 375/222, 375/257, 375/219, 375/295, 375/316, 375/259, 379/413.04, 379/399.01
• US Class Current: 375/260
• CPC Class Codes: H04B 3/487 Testing crosstalk effects
• CPC Class Codes: H04L 2025/03414 Multicarrier
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 25/03159 operating in the frequency domain H04L25/03165, H04L25/03178 take precedence

Abstract

Improved techniques for concurrent channel equalization and far-end crosstalk channel compensation (e.g., estimation and/or cancellation) in a multicarrier data transmission system are disclosed. The improved techniques can produce coefficients for an electronic fitter that provide channel equalization and for an electronic filter that provides cancellation of the far-end crosstalk. These coefficients can be initially trained and then subsequently updated during data transmission. Optionally, common coefficient determination resources can be utilized for both far-end crosstalk and near-end crosstalk purposes. These improved techniques are particularly suitable for use with a digital multicarrier communication system having multiple-input multiple-output systems.

Claims

1. A method for operating a multicarrier data transmission system capable of operating in a training mode and a data transfer mode, the multicarrier data transmission system comprising a far-end crosstalk (FEXT) unit and an adaptive channel equalizer, said method comprising:

placing the multicarrier data transmission system in the training mode;

receiving training symbols; and

processing the received training symbols to concurrently train the FEXT unit and the adaptive channel equalizer.

2. A method as recited in claim 1, wherein said method further comprises:

thereafter placing the multicarrier data transmission system in the data transfer mode;

receiving incoming data symbols; and

determining an error signal associated with detection of the incoming data symbols.

3. A method as recited in claim 2, wherein said method further comprises:

determining update parameters for the FEXT unit and the adaptive channel equalizer based on the error signal; and

updating the FEXT unit and the adaptive channel equalizer based on the update parameters.

4. A method as recited in claim 3, wherein said determining of the update parameters comprises:

determining a first set of update coefficients for the FEXT unit;

determining a second set of update coefficients for the adaptive channel equalizer,

wherein said determining of the first set of update coefficients and said determining of the second set of update coefficients are concurrently performed.

5. A method as recited in claim 4, wherein said updating of the FEXT unit and the adaptive channel equalizer comprises:

updating the FEXT unit in accordance with the first set of update coefficients; and

updating the adaptive channel equalizer in accordance with the second set of update coefficients.

6. A method as recited in claim 2, wherein said method further comprises:

determining update parameters for the FEXT unit and the adaptive channel equalizer based on the error signal; and

adaptively updating the FEXT unit and the adaptive channel equalizer based on the update parameters.

7. A multicarrier data transmission system capable of operating in a training mode and a data transfer mode, comprising:

a selector that places the multicarrier data transmission system in the training mode;

a receiver that receives training symbols;

a far-end crosstalk (FEXT) unit;

an adaptive channel equalizer; and

an adaptive update unit that processes the received training symbols to concurrently train the FEXT unit and the adaptive channel equalizer.

8. A multicarrier data transmission system as recited in claim 7, wherein the selector places the multicarrier data transmission system in the data transfer mode after the receiver receives the training symbols,

wherein the receiver further receives incoming data symbols, and

wherein said multicarrier data transmission system further comprises a subtractor that determines an error signal associated with detection of the incoming data symbols.

9. A multicarrier data transmission system as recited in claim 8, wherein the adaptive update unit further determines update parameters for the FEXT unit and the adaptive channel equalizer based on the error signal, and

wherein the FEXT unit and the adaptive channel equalizer are updated based on the update parameters.

10. A multicarrier data transmission system as recited in claim 9, wherein the adaptive update unit further determines a first set of update coefficients for the FEXT unit and a second set of update coefficients for the adaptive channel equalizer concurrently.

11. A multicarrier data transmission system as recited in claim 10, wherein the FEXT unit is updated in accordance with the first set of update coefficients, and

wherein the adaptive channel equalizer is updated in accordance with the second set of update coefficients.

12. A multicarrier data transmission system as recited in claim 8, wherein the adaptive update unit further determines update parameters for the FEXT unit and the adaptive channel equalizer based on the error signal, and

wherein the FEXT unit and the adaptive channel equalizer are adaptively updated based on the update parameters.

13. A multicarrier data transmission system capable of operating in a training mode and a data transfer mode, the multicarrier data transmission system comprising a far-end crosstalk (FEXT) unit and an adaptive channel equalizer, the multicarrier data transmission system further comprising:

means for placing the multicarrier data transmission system in the training mode;

means for receiving training symbols that have been transmitted over a transmission sequence; and

means for processing the received training symbols to concurrently train the FEXT unit and the adaptive channel equalizer.

14. A multicarrier data transmission system as recited in claim 13, wherein said multicarrier data transmission system further comprises:

means for thereafter placing the multicarrier data transmission system in the data transfer mode;

means for receiving incoming data symbols; and

means for determining an error signal associated with detection of the incoming data symbols.

15. A multicarrier data transmission system as recited in claim 14, wherein said multicarrier data transmission system further comprises:

means for determining update parameters for the FEXT unit and the adaptive channel equalizer based on the error signal; and

means for updating the FEXT unit and the adaptive channel equalizer based on the update parameters.

16. A multicarrier data transmission system as recited in claim 15, wherein said determining of the update parameters comprises:

means for determining a first set of update coefficients for the FEXT unit;

means for determining a second set of update coefficients for the adaptive channel equalizer,

wherein said means for determining the first set of update coefficients and said means for determining the second set of update coefficients are concurrently performed.

17. A multicarrier data transmission system as recited in claim 16, wherein said updating of the FEXT unit and the adaptive channel equalizer comprises:

means for updating the FEXT unit in accordance with the first set of update coefficients; and

means for updating the adaptive channel equalizer in accordance with the second set of update coefficients.

18. A multicarrier data transmission system as recited in claim 14, wherein said multicarrier data transmission system further comprises:

means for determining update parameters for the FEXT unit and the adaptive channel equalizer based on the error signal; and

means for adaptively updating the FEXT unit and the adaptive channel equalizer based on the update parameters.