Method and apparatus for an adaptive filter architecture

Patent metadata

Field	Value
Publication number	US-9654170-B2
Application number	US-201514928146-A
Country	US
Kind code	B2
Filing date	Oct 30, 2015
Priority date	Nov 11, 2008
Publication date	May 16, 2017
Grant date	May 16, 2017

Abstract

A system that incorporates teachings of the subject disclosure may include, for example, a method for scanning a radio frequency spectrum for an available frequency band, selecting an available frequency band in the radio frequency spectrum even if the available frequency band is affected by radio frequency interference, measuring a signal strength in portions of the available frequency band, correlating the signal strength of each portion to generate a correlation factor, detecting radio frequency interference in the available frequency band according to the correlation factor, and generating tuning coefficient data to cause the filter apparatus to substantially suppress the radio frequency interference in the available frequency band. Other embodiments are disclosed.

First claim

What is claimed is:

1. A method, comprising:
scanning, by a communication device, a radio frequency spectrum of a communication network;
identifying, by the communication device, an available frequency band in the radio frequency spectrum for initiating a communication session having a transmission link and a reception link for exchanging data with a remote wireless device operating within the available frequency band;
selecting, by the communication device, the available frequency band for engaging in communications independent of a presence of interference in the available frequency band;
determining, by the communication device, a correlation factor by correlating a signal strength in portions of the available frequency band;
detecting, by the communication device, according to the correlation factor an interference signal in the available frequency band;
responsive to determining the interference signal adversely affects the reception link:
generating, by the communication device, tuning coefficient data to suppress at least in part the interference signal; and
filtering, by the communication device, a first signal from the wireless device and in the reception link of the available frequency band according to the tuning coefficient data to generate a filtered signal; and

responsive to determining the interference signal adversely affects the transmission link:
generating a second signal for transmission to the wireless device and in the transmission link of the available frequency band adapted to circumvent at least in part the interference signal detected in the available frequency band; and
transmitting the second signal in the available frequency band.

2. The method of claim 1 , wherein the interference signal is generated by networks in the communication network designed to coexist in the available frequency band.

3. The method of claim 2 , wherein the networks operate according to disparate communication protocols.

4. The method of claim 1 , wherein at least a portion of signals exchanged during the communication session conform to an Orthogonal Frequency-Division Multiple Access (OFDMA) protocol.

5. The method of claim 1 , wherein the determining of the correlation factor comprises repeating a determination of the signal strength in the portions of the available frequency band.

6. The method of claim 1 , wherein the communication device is a mobile phone.

7. The method of claim 1 , wherein the communication device is a cellular base station.

8. A device, comprising:
a radio frequency transceiver; and
a circuit coupled to the radio frequency transceiver, wherein execution of instructions by the circuit cause the circuit to perform operations comprising:
scanning a radio frequency spectrum of a communication network;
selecting an available frequency band in the radio frequency spectrum for initiating a communication session with a wireless device having a transmission link and a reception link within the available frequency band for exchanging data independent of a presence of interference in the available frequency band;
determining a correlation factor by correlating a signal strength in portions of the available frequency band;
detecting according to the correlation factor an interference signal in the available frequency band;
responsive to determining the interference signal adversely affects the reception link with the wireless device, generating tuning coefficient data to suppress at least in part the interference signal in the reception link of the available frequency band; and
responsive to determining the interference signal adversely affects the transmission link with the wireless device, generating a signal for transmission in the transmission link of the available frequency band and adapted to circumvent at least in part the interference signal detected in the available frequency band.

9. The device of claim 8 , wherein the interference signal is generated by networks designed to coexist in a spectral region.

10. The device of claim 9 , wherein the networks operate according to disparate communication protocols.

11. The device of claim 8 , wherein the portions of the available frequency band comprises narrowband channels.

12. The device of claim 8 , comprising a filter apparatus, wherein the operations further comprise configuring the filter apparatus according to the tuning coefficient data to filter a signal in the reception link.

13. The device of claim 12 , wherein the configuring of the filter apparatus comprises tuning the filter apparatus to a filter frequency and a filter bandwidth according to the tuning coefficient data.

14. The device of claim 8 , wherein the instructions comprise computer instructions, and wherein the circuit comprises a processor to execute the computer instructions.

15. The device of claim 8 , wherein the operations further comprise spectrally conditioning a transmission signal to avoid at least in part the interference signal.

16. The device of claim 15 , wherein the operations further comprise transmitting the transmission signal in the portions of the available frequency band.

17. The device of claim 8 , wherein at least a portion of signals exchanged during the communication session conform to an Orthogonal Frequency-Division Multiple Access (OFDMA) protocol.

18. A non-transitory, machine-readable storage device, comprising executable instructions that, when executed by a processor, facilitate performance of operations, comprising:
scanning a radio frequency spectrum of a communication network;
selecting an available frequency band in the radio frequency spectrum for initiating a communication session with a remote device having a transmission link and a reception link for exchanging data within the available frequency band independent of a presence of interference in the available frequency band;
determining a correlation factor by correlating a signal strength in portions of the available frequency band;
detecting according to the correlation factor an interference signal in the available frequency band;
responsive to determining the interference signal adversely affects the reception link with the remote device, adapting a receiver that facilitates reception of first signals in the reception link of the available frequency band to suppress at least in part the interference signal; and
responsive to determining the interference signal adversely affects the transmission link with the remote device, adapting a transmitter that facilitates transmission of second signals in the transmission link of the available frequency band to circumvent at least in part the interference signal detected in the available frequency band.

19. The non-transitory, machine-readable storage device of claim 18 , wherein the operations further comprise transmitting a signal that is spectrally adapted to avoid at least in part the interference signal detected.

20. The non-transitory, machine-readable storage device of claim 18 , wherein the operations further comprise filtering a signal in the reception link according to tuning coefficient data to generate a filtered signal.

Assignees

• Isco Int Llc

Inventors

• Abdelmonem Amr
• Cordone Sean S

Classifications

• H04W72/542

  using measured or perceived quality · CPC title

• H04W88/06

  adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals · CPC title

• H04B1/7103 Primary

  the interference being multiple access interference · CPC title

• H04B1/707

  using direct sequence modulation · CPC title

• H04L27/0006

  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 title