Method and apparatus for an adaptive filter architecture

• US 10,097,235 B2
• Filed: 03/30/2017
• Issued: 10/09/2018
• Est. Priority Date: 11/11/2008
• Status: Active Grant

• Current Assignee: ISCO International Inc.
• Original Assignee: ISCO International Inc.
• Inventors: Abdelmonem, Amr, Cordone, Sean S.
• Primary Examiner(s): TAYONG, HELENE E
• Application Number:
  US15/474,436
• Publication Number:
  US 20170207816A1
• Time in Patent Office: 558 Days
• Field of Search: 375148
• 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 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/7093 Matched filter type
• CPC Class Codes: H04B 1/7103 the interference being multiple access interference
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04B 2001/1072 by tuning the receiver frequency
• CPC Class Codes: H04J 11/0023 Interference mitigation or co-ordination direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541
• CPC Class Codes: H04L 27/0006 Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio for spectrum sharing between different networks H04W16/14
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 43/16 Threshold monitoring
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: H04W 88/10 adapted for operation in multiple networks, e.g. multi-mode access points

Abstract

A system that incorporates teachings of the subject disclosure may include, for example, a method for selecting a spectral region in a radio frequency spectrum for initiating a communication session having an uplink and a downlink, correlating a signal strength of portions of the spectral region to generate a correlation factor, detecting radio frequency interference in the spectral region according to the correlation factor, and generating tuning coefficient data to substantially suppress the radio frequency interference in the spectral region during the communication session. Other embodiments are disclosed.

Claims

1. 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 first Direct Sequence Spread Spectrum (DSSS) signal within a radio frequency spectrum;

obtaining a signal strength for each of a plurality of channels within the first DSSS signal resulting in a plurality of signal strengths;

sorting the plurality of signal strengths of the plurality of channels according to signal strength;

selecting a first portion of the plurality of signal strengths and a second portion of the plurality of signal strengths, wherein each of the signal strengths of the first portion has a higher value than each of the signal strengths of the second portion;

determining that one or more of the signal strengths of the first portion of the plurality of signal strengths includes an interference signal resulting in a group of interference signals,

generating tuning coefficient data to suppress at least a portion of the group of interference signals while engaged in a communication session;

receiving a second DSSS signal within the radio frequency spectrum; and

filtering the second DSSS signal according to the tuning coefficient data to filter the portion of the group of interference signals using a filter, wherein the filter is a combination of notch filters, and wherein each notch frequency of the notch filters corresponds to a frequency of one of the group of interference signals.

2. The device of claim 1, wherein the operations further comprise selecting a threshold number of signal strengths, wherein selecting the first portion of the plurality of signal strengths comprise selecting the first portion of the plurality of signal strengths according to the threshold number.

3. The device of claim 1, wherein the operations further comprise selecting a threshold signal strength value, wherein selecting the first portion of the plurality of signal strengths comprise selecting the first portion of the plurality of signal strengths according to the threshold signal strength value.

4. The device of claim 1, wherein the operations further comprise calculating an average signal strength of the plurality of signal strengths, wherein selecting the first portion of the plurality of signal strengths comprise selecting the first portion of the plurality of signal strengths according to the average signal strength.

5. The device of claim 1, wherein the operations further comprise:

selecting a threshold signal strength value; and

determining a location with the radio frequency spectrum for each of the plurality of channels corresponding to each of the plurality of signal strengths resulting in a plurality of channel locations, wherein selecting the first portion of the plurality of signal strengths comprise selecting the first portion of the plurality of signal strengths according to the threshold signal strength value and the plurality of channel locations.

6. The device of claim 1, wherein the operations comprise determining a correlation factor for first portions of signal strengths, wherein determining that the one or more of the signal strengths of the first portion of the plurality of signal strengths includes an interference signal comprises wherein determining that the one or more of the signal strengths of the first portion of the plurality of signal strengths includes the interference signal according to the correlation factor.

7. The device of claim 1, wherein the plurality of channels is associated with a downlink portion of the radio frequency spectrum.

8. The device of claim 1, wherein at least a portion of second DSSS signal conform to an Orthogonal Frequency-Division Multiple Access (OFDMA) protocol.

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

receiving a first Direct Sequence Spread Spectrum (DSSS) signal within a radio frequency spectrum;

obtaining a signal strength for each of a plurality of channels within the first DSSS signal resulting in a plurality of signal strengths;

sorting the plurality of signal strengths of the plurality of channels according to signal strength;

selecting a threshold number of signal strengths;

selecting a first portion of the plurality of signal strengths according to the threshold number;

determining that one or more of the signal strengths of the first portion of the plurality of signal strengths includes an interference signal resulting in a group of interference signals,

generating tuning coefficient data to suppress at least a portion of the group of interference signals while engaged in a communication session;

receiving a second DSSS signal within the radio frequency spectrum; and

filtering the second DSSS signal according to the tuning coefficient data to filter the portion of the group of interference signals using a filter, wherein the filter is a combination of notch filters, and wherein each notch frequency of the notch filters corresponds to a frequency of one of the group of interference signals.

10. The non-transitory machine-readable storage medium of claim 9, wherein the operations further comprise selecting a threshold signal strength value, wherein selecting the first portion of the plurality of signal strengths comprise selecting the first portion of the plurality of signal strengths according to the threshold signal strength value.

11. The non-transitory machine-readable storage medium of claim 9, wherein the operations further comprise calculating an average signal strength of the plurality of signal strengths, wherein selecting the first portion of the plurality of signal strengths comprise selecting the first portion of the plurality of signal strengths according to the average signal strength.

12. The non-transitory machine-readable storage medium of claim 9, wherein the operations further comprise:

selecting a threshold signal strength value; and

determining a location with the radio frequency spectrum for each of the plurality of channels corresponding to each of the plurality of signal strengths resulting in a plurality of channel locations, wherein selecting the first portion of the plurality of signal strengths comprise selecting the first portion of the plurality of signal strengths according to the threshold signal strength value and the plurality of channel locations.

13. The non-transitory machine-readable storage medium of claim 9, wherein the operations comprise determining a correlation factor for first portions of signal strengths, wherein determining that the one or more of the signal strengths of the first portion of the plurality of signal strengths includes an interference signal comprises wherein determining that the one or more of the signal strengths of the first portion of the plurality of signal strengths includes the interference signal according to the correlation factor.

14. The non-transitory machine-readable storage medium of claim 9, wherein the plurality of channels is associated with a downlink portion of the radio frequency spectrum.

15. A method, comprising:

receiving, by a processing system including a processor, a first Direct Sequence Spread Spectrum (DSSS) signal within a radio frequency spectrum;

obtaining, by the processing system, a signal strength for each of a plurality of channels within the first DSSS signal resulting in a plurality of signal strengths;

sorting, by the processing system, the plurality of signal strengths of the plurality of channels according to signal strength;

selecting, by the processing system, a threshold signal strength value;

selecting, by the processing system, a first portion of the plurality of signal strengths according to the threshold signal strength value;

determining, by the processing system, that one or more of the signal strengths of the first portion of the plurality of signal strengths includes an interference signal resulting in a group of interference signals,

generating, by the processing system, tuning coefficient data to suppress at least a portion of the group of interference signals while engaged in a communication session;

receiving, by the processing system, a second DSSS signal within the radio frequency spectrum; and

filtering, by the processing system, the second DSSS signal according to the tuning coefficient data to filter the portion of the group of interference signals using a filter, wherein the filter is a combination of notch filters, and wherein each notch frequency of the notch filters corresponds to a frequency of one of the group of interference signals.

16. The method of claim 15, comprising selecting, by the processing system, a threshold number of signal strengths, wherein selecting, by the processing system, the first portion of the plurality of signal strengths comprise selecting the first portion of the plurality of signal strengths according to the threshold number.

17. The method of claim 15, comprising calculating, by the processing system, an average signal strength of the plurality of signal strengths, wherein selecting the first portion of the plurality of signal strengths comprise selecting, by the processing system, the first portion of the plurality of signal strengths according to the average signal strength.

18. The method of claim 15, comprising determining, by the processing system, a location with the radio frequency spectrum for each of the plurality of channels corresponding to each of the plurality of signal strengths resulting in a plurality of channel locations, wherein selecting the first portion of the plurality of signal strengths comprise selecting, by the processing system, the first portion of the plurality of signal strengths according to the plurality of channel locations.

19. The method of claim 15, wherein the plurality of channels is associated with a downlink portion of the radio frequency spectrum.

20. The method of claim 15, wherein at least a portion of second DSSS signal conform to an Orthogonal Frequency-Division Multiple Access (OFDMA) protocol.