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

• US 10,039,117 B2
• Filed: 06/13/2017
• Issued: 07/31/2018
• 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): Crutchfield, Christopher
• Assistant Examiner(s): Voltaire, Jean F
• Application Number:
  US15/621,086
• Publication Number:
  US 20170280464A1
• Time in Patent Office: 413 Days
• Field of Search: 370329
• 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 method that incorporates teachings of the subject disclosure may include, for example, analyzing a signal to identify a present interference and extracting the interference from the signal. The extracting can include comparing a presence time for the interference with a reference time; if the presence time exceeds the reference time and at least one of a plurality of filters is available for filtering the present interference, an available filter of the plurality of filters is activated, thereby causing filtering of the interference from the signal. If no filter is available due to activation of the filters for filtering a plurality of previously identified interferences, a priority order is determined for the present interference and the previously identified interferences, based on their interference signal levels. The filters are assigned to the interferences in accordance with the priority order. Other embodiments are disclosed.

Claims

1. A method comprising:

receiving, by a processing system including a processor, a signal including a communication signal, wherein the processing system includes a plurality of filters;

analyzing, by the processing system, the signal to identify a present interference; and

extracting, by the processing system, the present interference from the signal,

wherein the extracting comprises;

determining a presence time duration for the present interference;

comparing the presence time duration with a reference time duration;

responsive to the presence time duration exceeding the reference time duration;

responsive to at least one of the plurality of filters being available for filtering the present interference;

activating an available filter of the plurality of filters; and

tuning the activated filter, thereby filtering the present interference from the signal;

responsive to none of the plurality of filters being available for filtering the present interference due to activation of the plurality of filters for filtering a plurality of previously identified interferences;

determining a priority order of a set of interferences comprising the present interference and the plurality of previously identified interferences, based on interference signal levels thereof; and

assigning the plurality of filters to the set of interferences, in accordance with the priority order.

2. The method of claim 1, wherein the signal comprises a wideband communication signal having a frequency bandwidth including a plurality of narrowband channels.

3. The method of claim 2, wherein the present interference comprises a first narrowband interference signal in a first narrowband channel.

4. The method of claim 3, wherein a second interference comprises a second narrowband interference signal in a second narrowband channel, and wherein the activating further comprises selecting an available filter having a filter bandwidth covering both the first and second narrowband channels.

5. The method of claim 4, wherein the first narrowband channel and the second narrowband channel are separated by a third narrowband channel without interference.

6. The method of claim 1, wherein the plurality of filters comprise filters having different bandwidths, and wherein the activating further comprises selecting an available filter having a filter bandwidth greater than an interference bandwidth of the present interference.

7. The method of claim 1, wherein the reference time duration corresponds to a frame rate for data exchange performed by the processing system.

8. The method of claim 1, wherein the present interference has a first interference signal strength, and wherein the assigning further comprises removing an assignment of a filter of the plurality of filters from an interference of the plurality of previously identified interferences having a second interference signal strength, responsive to determining that the second interference signal strength is less than the first interference signal strength during a predetermined time duration.

9. The method of claim 2, further comprising:

updating, by the processing system, an interference status for each of the plurality of narrowband channels; and

transmitting, by the processing system, a list of the plurality of narrowband channels and the updated interference status to a memory accessible to the processing system.

10. The method of claim 1, wherein each of the plurality of filters comprises an adaptive notch filter (ANF) coupled to the processor via a switch.

11. A device comprising:

a processing system including a processor; and

a memory that stores executable instructions that, when executed by the processing system, facilitate performance of operations comprising;

receiving a signal including a communication signal, wherein the processing system includes a plurality of filters, and wherein the signal comprises a wideband communication signal having a frequency bandwidth including a plurality of narrowband channels;

analyzing the signal to identify a present interference; and

extracting the present interference from the signal,

wherein the extracting comprises;

determining a presence time duration for the present interference;

comparing the presence time duration with a reference time duration;

responsive to the presence time duration exceeding the reference time duration;

responsive to at least one of the plurality of filters being available for filtering the present interference;

activating an available filter of the plurality of filters, thereby causing filtering of the present interference from the signal;

responsive to none of the plurality of filters being available for filtering the present interference due to activation of the plurality of filters for filtering a plurality of previously identified interferences;

determining a priority order of a set of interferences comprising the present interference and the plurality of previously identified interferences, based on interference signal levels thereof; and

assigning the plurality of filters to the set of interferences, in accordance with the priority order.

12. The device of claim 11, wherein the present interference comprises a first narrowband interference signal in a first narrowband channel, wherein a second interference comprises a second narrowband interference signal in a second narrowband channel, and wherein the activating further comprises selecting an available filter having a filter bandwidth covering both the first and second narrowband channels.

13. The device of claim 11, wherein the operations further comprise:

updating an interference status for each of the plurality of narrowband channels; and

transmitting a list of the plurality of narrowband channels and the updated interference status to the memory.

14. The device of claim 11, wherein the plurality of filters comprise filters having different bandwidths, and wherein the activating further comprises selecting an available filter having a filter bandwidth greater than an interference bandwidth of the present interference.

15. The device of claim 11, wherein the present interference has a first interference signal strength, and wherein the assigning further comprises removing an assignment of a filter of the plurality of filters from an interference of the plurality of previously identified interferences having a second interference signal strength, responsive to determining that the second interference signal strength is less than the first interference signal strength during a predetermined time duration.

16. A non-transitory machine-readable medium comprising executable instructions that, when executed by a processing system including a processor, facilitate performance of operations comprising:

receiving a signal including a communication signal, wherein the processing system includes a plurality of filters;

analyzing the signal to identify a present interference; and

extracting the present interference from the signal, wherein the extracting comprises;

determining a presence time duration for the present interference;

comparing the presence time duration with a reference time duration;

responsive to the presence time duration exceeding the reference time duration;

responsive to at least one of the plurality of filters being available for filtering the present interference;

activating an available filter of the plurality of filters, thereby causing filtering of the present interference from the signal;

responsive to none of the plurality of filters being available for filtering the present interference due to activation of the plurality of filters for filtering a plurality of previously identified interferences;

determining a priority order of a set of interferences comprising the present interference and the plurality of previously identified interferences, based on interference signal levels thereof; and

assigning the plurality of filters to the set of interferences, in accordance with the priority order.

17. The non-transitory machine-readable medium of claim 16, wherein the signal comprises a wideband communication signal having a frequency bandwidth including a plurality of narrowband channels, and wherein the operations further comprise:

updating an interference status for each of the plurality of narrowband channels; and

transmitting a list of the plurality of narrowband channels and the updated interference status.

18. The non-transitory machine-readable medium of claim 16, wherein the present interference comprises a first narrowband interference signal in a first narrowband channel, wherein a second interference comprises a second narrowband interference signal in a second narrowband channel, and wherein the activating further comprises selecting an available filter having a filter bandwidth covering both the first and second narrowband channels.

19. The non-transitory machine-readable medium of claim 16, wherein the plurality of filters comprise filters having different bandwidths, and wherein the activating further comprises selecting an available filter having a filter bandwidth greater than an interference bandwidth of the present interference.

20. The non-transitory machine-readable medium of claim 16, wherein the present interference has a first interference signal strength, and wherein the assigning further comprises removing an assignment of a filter of the plurality of filters from an interference of the plurality of previously identified interferences having a second interference signal strength, responsive to determining that the second interference signal strength is less than the first interference signal strength during a predetermined time duration.