Granted Patent B2

US 9,515,857 · App. 11/599,210 · Granted Dec 6, 2016

Abstract

Claims (34)

1. A method for combating noise in an adaptive communication system, comprising:

using noise coefficients to pre-distort data that is to be transmitted over one of a number of transmission lines; and

dynamically adjusting the noise coefficients as a function of sync symbols that are synchronized across the number of transmission lines, wherein a power at which one or more of the sync symbols are transmitted is selectively adjusted between non-zero values to continuously generate noise by transmitting the one or more sync symbols, such that the noise associated with one of the transmission lines is uniquely analyzed to facilitate dynamically adjusting the noise coefficients.

2. The method of claim 1 , wherein data symbols are interspersed with the sync symbols for a given subcarrier as the sync symbols are transmitted over the number of transmission lines.

3. The method of claim 1 , wherein the sync symbols repeat at a regular interval related to the number of transmission lines in the system.

4. The method of claim 1 , wherein the one transmission line communicates the data between a centralized group of endpoints and at least one distributed endpoint.

5. A method of estimating noise in a communication system, comprising:

providing a number of signal streams over a respective number of transmission lines, wherein individual signal streams are associated with individual transmission lines, and wherein the individual signal streams comprise timing elements that are synchronized over the number of signal streams;

relative to a timing element of a first individual signal stream that is associated with a first of the number of transmission lines, altering a power at which the timing elements of the other individual signal streams are provided on the other transmission lines;

determining a noise coefficient that relates to the first transmission line based on crosstalk, if any, caused by the timing element of the first transmission line on the other transmission lines; and

using the noise coefficient to pre-distort data to be transmitted over the first transmission line,

wherein the timing elements comprise sync symbols that are synchronized over the number of transmission lines as a function of a superframe and a predefined offset.

6. The method of claim 5 , further comprising:

using the noise coefficient to pre-distort data to be transmitted over the other transmission lines.

7. The method of claim 5 , wherein the noise coefficient is determined at a distributed endpoint, and wherein the noise coefficient is communicated from the distributed endpoint over the one of the transmission lines to a centralized endpoint.

8. The method of claim 5 , wherein the individual signal streams further comprise: data elements that are interspersed between the timing elements.

9. A communication system, comprising:

a first endpoint configured to pre-distort data by using noise coefficients and transmit the pre-distorted signal over a transmission line;

a second endpoint configured to receive the pre-distorted signal via the transmission line and to recover the data;

wherein the first and second endpoints are configured to cooperatively and dynamically adjust the noise coefficients as a function of sync symbols that are transmitted over the transmission line;

additional transmission lines that are associated with additional first endpoints and additional second endpoints, respectively;

wherein additional timing elements are transmitted between the additional first and second endpoints over the additional transmission lines, and wherein the additional timing elements are synchronized with the sync symbols,

wherein the additional timing elements comprise additional sync symbols that are synchronized over the number of additional transmission lines as a function of a superframe and a predefined offset.

10. The system of claim 9 , wherein the sync symbols have data elements interspersed therebetween, and wherein the additional timing elements have data elements interspersed therebetween.

11. The system of claim 9 , wherein the sync symbols and the additional timing elements repeat at a regular interval related to a number of transmission lines in the system.

12. A communication system, comprising:

a number of first endpoints configured to pre-distort respective data by using noise coefficients and transmit respective pre-distorted signals over a number of respective transmission lines;

a number of second endpoints configured to receive the respective pre-distorted signals via the number of respective transmission lines and to recover the respective data; and

means to cooperatively and dynamically adjust the noise coefficients as a function of sync symbols that are synchronously transmitted over the respective number of transmission lines,

means to adjust a power at which one or more of the sync symbols are transmitted between non-zero values to continuously generate noise by transmitting the one or more sync symbols, such that the noise associated with one of the transmission lines is uniquely analyzed to facilitate dynamically adjusting the noise coefficients.

13. The system of claim 12 , wherein a power at which one or more of the sync symbols are transmitted is selectively adjusted such that noise associated with one of the transmission lines is uniquely analyzed to facilitate dynamically adjusting the noise coefficients.

14. The system of claim 12 , wherein the sync symbols repeat at a regular interval related to a number of respective transmission lines in the system.

15. The system of claim 12 , wherein the sync symbols have data elements interspersed therebetween.

16. The system of claim 12 , wherein the communication system comprises a DSL communication system.

Assignments (6)