System and method for detecting noise source in a power line communications system

• US 7,468,657 B2
• Filed: 01/30/2006
• Issued: 12/23/2008
• Est. Priority Date: 01/30/2006
• Status: Active Grant

• Current Assignee: Chemtron Research LLC (Intellectual Ventures LLC)
• Original Assignee: Current Technologies LLC (Pattern Inc.)
• Inventors: Yaney, David Stanley
• Primary Examiner(s): Pham; Toan N
• Application Number:
  US11/341,645
• Publication Number:
  US 20070179721A1
• Time in Patent Office: 1,058 Days
• Field of Search: 340/538, 340/538.12, 340/310.13, 340/310.16, 702/59, 324/512, 324/534, 375/259, 375/288
• US Class Current: 340/538
• CPC Class Codes: H04B 1/1027 assessing signal quality or detecting noise/interference for the received signal
• CPC Class Codes: H04B 15/00 Suppression or limitation of noise or interference by means associated with receiver H04B1/10
• CPC Class Codes: H04B 2203/5441 Wireless systems or telephone
• CPC Class Codes: H04B 2203/5445 Local network
• CPC Class Codes: H04B 3/542 the information being in digital form
• CPC Class Codes: H04L 25/085 Arrangements for reducing interference in line transmission systems, e.g. by differential transmission

Abstract

A method for detecting noise location information in a power line distribution system is disclosed. In one embodiment, the method includes the steps of receiving link quality data for a first power line communication link between a first and second power line communications device, determining an asymmetry in the link quality data of the link, and determining location information for the noise source based on the location of the first power line communications device or the location of the second power line communications device.

Claims

1. A method of determining location information for a noise source in a power line communication system, comprising:

receiving link quality data for a first power line communication link between a first and second power line communications device,

wherein the link quality data includes upstream link quality data and downstream link quality data;

determining an asymmetry in the upstream link quality data and the downstream link quality of said link; and

determining location information for the noise source based on the location of the first power line communications device or the location of the second power line communications device.

2. The method of claim 1, wherein determining an asymmetry includes determining that the ratio of the upstream link quality data to the downstream link quality data is above or below a predetermined threshold value.

3. The method of claim 1, wherein an asymmetry in upstream link quality data and the downstream link quality indicates that one of said first and second power line communications devices has degraded reception performance.

4. The method of claim 1, further comprising:

receiving link quality data for a plurality of power line communication links;

storing said link quality data of said plurality of power line communication links in a memory.

5. The method of claim 4, wherein determining an asymmetry in the upstream link quality data and the downstream link quality comprises determining a standard deviation value related to the link quality data for said plurality of power line communication links.

6. The method of claim 5, wherein determining an asymmetry in the upstream link quality data and the downstream link quality further comprises:

determining a mean related to the link quality data for said plurality of power line communication links; and

determining that a link quality value of the first power line communication link differs from said mean by an amount greater than said standard deviation value.

7. The method of claim 1, wherein determining an asymmetry comprises determining a ratio of an upstream link quality value to a downstream link quality value.

8. The method of claim 1, wherein said determining location information for the noise source comprises determining location information for one of said first and second power line communications devices having degraded reception performance.

9. The method of claim 1, further comprising determining that said asymmetry varies with time.

10. The method of claim 1, wherein said asymmetry varies with time, the method further comprising determining a correlation between the voltage carried by a power line of the power line communication link and said asymmetry.

11. The method of claim 1, wherein said link quality data comprises information of the amount of data received per unit of time.

12. A method of determining location information for a noise source in a power line communication system, comprising:

receiving link quality data for at least one power line communication link between a plurality of power line communications devices;

determining that at least one of said power line communications devices communicating over said at least one power line communication link has degraded reception performance and not degraded transmission performance; and

determining location information for said at least one power line communications devices.

13. The method of claim 12, determining that at least one of said power line communications devices has degraded reception performance comprises identifying an asymmetry in the upstream and downstream link quality of said at least one power line communication link.

14. The method of claim 13, further comprising determining a correlation between the voltage carried by a power line of said at least one power line communication link and said asymmetry.

15. The method of claim 12, further comprising determining a correlation between when said at least one power line communications devices has degraded reception performance and a peak of the voltage carried by a power line of said at least one power line communication link.

16. The method of claim 12, wherein the link quality data includes upstream link quality data and downstream link quality data.

17. The method of claim 12, further comprising:

receiving link quality data for a plurality of power line communication links;

storing said link quality data of said plurality of power line communication links in a memory.

18. The method of claim 17, wherein determining that at least one of said power line communications devices has degraded reception performance comprises determining a standard deviation value related to the link quality data for said plurality of power line communication links.

19. The method of claim 18, wherein determining that at least one of said power line communications devices has degraded reception performance further comprises:

determining a mean related to the link quality data for said plurality of power line communication links; and

determining that a link quality value for said at least one power line communication link differs from said mean by an amount greater than said standard deviation value.

20. The method of claim 12, wherein said link quality data comprises information of the amount of data received per unit of time.

21. The method of claim 12, wherein said link quality data comprises bit error rate information.

22. A method of determining location information for a noise source in a power line communication system, comprising:

receiving link quality data for a plurality of power line communication links;

wherein the link quality data includes data of an upstream link quality and a downstream link quality for each of the plurality of power line communication links;

determining an asymmetry in the upstream and downstream link quality of at least one of said communication links between a first communication device and a second communication device; and

determining that said first communication device communicating over said at least one link has a degraded reception performance and not a degraded transmission performance and that said second communication device communicating over said at least one link does not have a degraded reception performance.

23. The method of claim 22, further comprising determining location information for said first communication device.

24. The method of claim 23, further comprising transmitting said location information to a remote computer.

25. The method of claim 22, wherein said asymmetry varies with time, the method further comprising determining a correlation between the voltage carried by a power line of said at least one link and said asymmetry.

26. The method of claim 22, wherein said link quality data comprises information of the amount of data received per unit of time.

27. The method of claim 22, wherein determining an asymmetry comprises determining a standard deviation of the ratio of the upstream link quality to the downstream link quality for said plurality of power line communication links.

28. The method of claim 27, wherein determining an asymmetry further comprises:

determining a mean of the ratio of the upstream link quality to the downstream link quality for said plurality of power line communication links; and

determining that the ratio of the upstream link quality to the downstream link quality differs from said mean by an amount greater than said standard deviation.

29. A method of determining location information for a noise source in a power line communication system, comprising:

receiving link quality data for a plurality of power line communication links, wherein said link quality data includes upstream link quality data and downstream link quality data;

determining a ratio of the upstream link quality data to the downstream link quality data for each of said plurality of links;

determining that said ratio of one of said links is not within acceptable parameters; and

identifying a communication device communicating over said one link that has degraded reception performance and not degraded transmission performance.

30. The method of claim 29, wherein said ratio of said one of said links varies with time, the method further comprising determining a correlation between the voltage carried by a power line measured at said communication device and said ratio of said one of said links.

31. The method of claim 30, wherein said determining said correlation comprises determining that said ratio varies on a one hundred twenty hertz cycle.

32. A method of determining location information for a noise source in a power line communication system, comprising:

receiving link quality data for a plurality of power line communication links, wherein at least some of said links communicate over the same power line; and

processing said link quality data to identify a communication device that has degraded reception performance and not degraded transmission performance.

33. The method of claim 32, wherein said link quality data comprises data of an upstream link quality and a downstream link quality, and said processing comprises:

determining a ratio of the upstream link quality to the downstream link quality for each of said plurality of links; and

determining that said ratio for one of said links is not within acceptable parameters.