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

• US 9,026,057 B2
• Filed: 05/22/2014
• Issued: 05/05/2015
• Est. Priority Date: 02/02/1999
• Status: Expired due to Term

• Current Assignee: ISCO International Inc.
• Original Assignee: ISCO International Inc.
• Inventors: Jagger, Charles E., Willetts, Mark N., Tobia, Micolino
• Primary Examiner(s): LE, THANH C
• Application Number:
  US14/285,173
• Publication Number:
  US 20140254488A1
• Time in Patent Office: 348 Days
• Field of Search: 455/423, 455/424, 455/63.1, 455/67.11, 455/67.13, 455/26.1, 455/296, 375/346, 375/349
• US Class Current: 455/63.1
• 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 measuring power levels in narrow frequency bands of signals provided by a radio frequency receiver configured to scan radio frequency signals over a wide frequency band, calculating an average wideband power level from at least a portion of the measured power levels, determining a threshold from the average wideband power level, the portion of the measured power levels in the narrow frequency bands, or both, detecting from the signals narrow band interference based on the threshold, and substantially suppressing the detected narrow band interference. Other embodiments are disclosed.

Claims

1. A device comprising:

a memory to store instructions; and

a circuit coupled to the memory, wherein execution of the instructions by the circuit causes the circuit to perform operations comprising;

detecting narrow band signal power levels received in a group of channels of a wide frequency band, wherein the detecting of the narrow band signal power levels is according to an analysis order for a group of channels, wherein the analysis order is non-sequential and is determined based on a probability of having interference;

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

detecting interference associated with a channel based on the average wideband power level, to obtain a detected interference; and

initiating an interference mitigation strategy according to the detecting of the interference.

2. The device of claim 1, wherein the initiating of the interference mitigation strategy comprises configuring a filter according to the detected interference to suppress at least a first portion of signals of the channel.

3. The device of claim 1, wherein the detecting of the narrow band signal power levels includes performing signal strength compensation for a guard band.

4. The device of claim 3, wherein the detecting of the narrow band signal power levels and the signal strength compensation for the guard band comprises performing frequency shifting for the guard band to generate received signal strength indicator measurements for the guard band.

5. The device of claim 3, wherein the operations further comprise reporting spectral information relating to the guard band to a remote device.

6. The device of claim 1, wherein the probability of having interference is determined based on historical interference patterns.

7. The device of claim 1, wherein the probability of having interference is determined based on interference data accessed by the circuit.

8. The device of claim 1, wherein the device is part of a base station.

9. The device of claim 8, wherein the base station is a cellular base station.

10. The device of claim 1, wherein the less than all of the narrow band signal power levels corresponds to a number of high power levels.

11. The device of claim 10, wherein the number of high power levels corresponds to a number of notch modules selected from among a plurality of notch modules to be employed by a filter utilized in the interference mitigation strategy.

12. A method, comprising:

detecting, by a system including a processor, narrow band signal power levels received in a group of channels of a wide frequency band, wherein the detecting of the narrow band signal power levels is according to an analysis order for a group of channels, wherein the analysis order is non-sequential and is determined based on a probability of having interference;

determining an adaptive threshold based on at least some of the narrow band signal power levels;

detecting interference associated with a channel based on the adaptive threshold; and

initiating an interference mitigation strategy according to the detecting of the interference.

13. The method of claim 12, wherein the detecting of the narrow band signal power levels comprises performing signal strength compensation for a guard band.

14. The method of claim 13, wherein the performing of the signal strength compensation for the guard band comprises performing frequency shifting for the guard band to generate received signal strength indicator measurements for the guard band.

15. The method of claim 12, wherein the probability of having interference is determined based on historical interference patterns.

16. The method of claim 12, wherein the probability of having interference is determined based on interference data observed by the processor.

17. The method of claim 12, wherein the system comprises a base station.

18. The method of claim 12, wherein the determining of the adaptive threshold excludes a number of high power levels.

19. A computer readable storage device comprising instructions, which responsive to being executed by a circuit, cause the circuit to perform operations comprising:

detecting, by a system including a processor, narrow band signal power levels received in a group of channels of a wide frequency band, wherein the detecting of the narrow band signal power levels comprises scanning a first channel having a higher probability of having interference before scanning a second channel having a lower probability of having interference;

determining an adaptive threshold based on at least some of the narrow band signal power levels;

detecting interference associated with a channel based on the adaptive threshold; and

initiating an interference mitigation strategy according to the detecting of the interference.

20. The computer readable storage device of claim 19, wherein the probability of having interference is determined based on at least one of historical interference patterns or interference data observed by the circuit, and wherein the operations further comprise one of adjusting channels scanned for interference, changing the threshold, adjusting a hang time, adjusting an attack time or a combination thereof.