Method and device for maintaining the performance quality of a communication system in the presence of narrow band interference

• US 8,780,808 B2
• Filed: 07/17/2012
• Issued: 07/15/2014
• Est. Priority Date: 02/02/1999
• Status: Expired due to Fees

• Current Assignee: ISCO International Inc.
• Original Assignee: ISCO International Inc.
• Inventors: Jagger, Charles E., Willetts, Mark N., Tobia, Micolino
• Primary Examiner(s): Lee, Jae Y
• Assistant Examiner(s): Voltaire, Jean F
• Application Number:
  US13/551,447
• Publication Number:
  US 20120281731A1
• Time in Patent Office: 728 Days
• Field of Search: 370328-331
• US Class Current: 370/328
• CPC Class Codes: H04B 1/10 Means associated with receiver for limiting or suppressing noise or interference
• CPC Class Codes: H04B 1/1036 with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters H04B1/123 takes precedence; filter circuits H03H
• CPC Class Codes: H04B 1/71 the interference being narrowband interference
• CPC Class Codes: H04B 1/7103 the interference being multiple access interference
• CPC Class Codes: H04B 15/00 Suppression or limitation of noise or interference by means associated with receiver H04B1/10
• CPC Class Codes: H04B 2001/1063 using a notch filter
• CPC Class Codes: H04B 2201/709709 Methods of preventing interference
• CPC Class Codes: H04B 2201/709718 Determine interference
• CPC Class Codes: H04B 7/005 Control of transmission; Equalising
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 28/16 Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
• CPC Class Codes: H04W 28/20 Negotiating bandwidth
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/245 taking into account received signal strength
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/541 : using the level of interference
• CPC Class Codes: H04W 72/542 : using measured or perceived quality
• CPC Class Codes: H04W 88/02 : Terminal devices
• CPC Class Codes: H04W 88/08 : Access point devices

Abstract

A system that incorporates teachings of the subject disclosure may include, for example, a method for analyzing a wide frequency band with respect to signal power levels in specified narrow frequency bands, detecting narrow band signal power levels received in the specified narrow frequency bands, determining an average composite wideband power level from the narrow band signal power levels, determining an adaptive threshold, detecting narrow band interference according to one of the average composite wideband power level, the adaptive threshold, or both, prioritizing the detected narrow band interference, and selectively filtering a portion of the detected narrow band interference according to the prioritization. Other embodiments are disclosed.

Claims

1. A method, comprising:

analyzing a wide frequency band with respect to signal power levels in specified narrow frequency bands;

detecting narrow band signal power levels received in the specified narrow frequency bands;

determining an average composite wideband power level from less than all of the narrow band signal power levels;

determining an adaptive threshold according to the average composite wideband power level;

detecting narrow band interference according to one of the average composite wideband power level, the adaptive threshold, or both;

prioritizing the detected narrow band interference; and

selectively filtering a portion of the detected narrow band interference according to the prioritization.

2. The method of claim 1, wherein the analyzing of the wide frequency band, the detecting of the narrow band signal power levels, the determining of the average composite wideband power level, the determining of the adaptive threshold, the detecting of the narrow band interference, the prioritizing, and the selectively filtering are performed by a device comprising a processor executing computer instructions.

3. The method of claim 2, wherein the device is a cellular base station.

4. The method of claim 1, wherein the analyzing of the wide frequency band, the detecting of the narrow band signal power levels, the determining of the average composite wideband power level, the determining of the adaptive threshold, the detecting of the narrow band interference, the prioritizing, and the selectively filtering are performed by a device comprising a circuit configured according to instructions.

5. The method of claim 1, wherein the selectively filtering of the portion of the detected narrow band interference according to the prioritization comprises identifying the portion of the detected narrow band interference likely to cause signal degradation in the wide frequency band according to the prioritization.

6. The method of claim 1, wherein the selectively filtering of the portion of the detected narrow band interference comprises selectively filtering the portion of the detected narrow band interference with at least one of a plurality of selectable filters.

7. The method of claim 6, wherein the plurality of selectable filters are cascaded.

8. The method of claim 1, wherein the prioritizing of the detected narrow band interference comprises:

determining power levels of the detected narrow band interference; and

prioritizing the detected narrow band interference according to a portion of the determined power levels.

9. A memory device, comprising instructions which when executed by a circuit cause the circuit to perform operations, comprising:

analyzing a wide frequency band;

detecting signal power levels in the wide frequency band;

determining an average composite wideband power level from less than all of the signal power levels

determining a threshold according to the average composite wideband power level;

detecting narrow band interference in signals of the wide frequency band based on one of the threshold, the average composite wideband power level, or both, wherein the signals are provided by a radio frequency receiver that scans radio frequency signals over the wide frequency band; and

prioritizing the detected narrow band interference; and

selectively filtering a portion of the detected narrow band interference according to the prioritization.

10. The memory device of claim 9, wherein the signal power levels are measured in narrow frequency bands of signals provided by the radio frequency receiver.

11. The memory device of claim 9, wherein the portion of the detected narrow band interference is filtered with one or more notch filters.

12. The memory device of claim 9, wherein the selectively filtering of the portion of the detected narrow band interference according to the prioritization comprises identifying the portion of the detected narrow band interference likely to cause signal degradation in the wide frequency band.

13. The memory device of claim 9, wherein the prioritizing of the detected narrow band interference comprises prioritizing the detected narrow band interference according to power levels of the detected narrow band interference.

14. The memory device of claim 9, wherein the detecting comprises measuring power levels in narrow frequency bands in the wide frequency band, and wherein the prioritizing of the detected narrow band interference comprises prioritizing the detected narrow band interference according to at least a portion of the measured power levels.

15. A device, comprising:

a filter; and

a circuit coupled to the filter, wherein execution of instructions by the circuit cause the circuit to perform operations comprising;

measuring narrow band signal power levels in narrow frequency bands from signals provided by a radio frequency receiver;

determining an average composite wideband power level from less than all of the narrow band signal power levels;

detecting from the signals provided by the radio frequency receiver narrow band interference according to one of the average composite wideband power level, the threshold, or both;

prioritizing the detected narrow band interference; and

causing the filter to remove at least a portion of the detected narrow band interference according to the prioritization.

16. The device of claim 15, wherein the circuit is a processor, and wherein the instructions are computer instructions executed by the processor.

17. The device of claim 15, wherein the device is a cellular base station.

18. The device of claim 15, wherein the filter has a variable bandwidth.

19. The device of claim 15, wherein the filter comprises a plurality of selectable filters.

20. The device of claim 15, wherein the prioritizing of the detected narrow band interference comprises:

determining power levels of the detected narrow band interference; and

prioritizing the detected narrow band interference according to the determined power levels.