Method and apparatus for adapting multi-band ultra-wideband signaling to interference sources

• US 7,342,973 B2
• Filed: 02/20/2003
• Issued: 03/11/2008
• Est. Priority Date: 09/26/2001
• Status: Active Grant

• Current Assignee: General Atomics, Inc.
• Original Assignee: General Atomics, Inc.
• Inventors: Lin, Susan C., Walker, Michael L., Rogerson, Gerald D., Furuno, David S., Gehring, Stephan W.
• Primary Examiner(s): Payne; David C.
• Assistant Examiner(s): Wong; Linda
• Application Number:
  US10/371,064
• Publication Number:
  US 20040048574A1
• Time in Patent Office: 1,846 Days
• Field of Search: 375/260, 375/257, 375/295, 375/316, 375/265, 375/275, 375/139, 375/267, 375/278, 375/284, 375/285, 375/346, 375/348, 340/310.01, 455/101, 455/103, 370441-442
• US Class Current: 375/260
• CPC Class Codes: H03K 2005/00026 controlled by an analog electrical signal, e.g. obtained after conversion by a D/A converter
• CPC Class Codes: H03K 2005/00058 controlled by a digital setting
• CPC Class Codes: H03K 2005/00097 Avoiding variations of delay using feedback, e.g. controlled by a PLL
• CPC Class Codes: H03K 2005/00267 using D/A or A/D converters
• CPC Class Codes: H03K 3/0315 Ring oscillators
• CPC Class Codes: H03K 5/133 using a chain of active delay devices
• CPC Class Codes: H03K 5/1508 using a plurality of delay lines
• CPC Class Codes: H04B 1/7176 Data mapping, e.g. modulation
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 5/0005 Time-frequency
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling

Abstract

A method and apparatus for operation in a multi-frequency band system in the presence of an interference, the method comprising the steps of: receiving signaling in a plurality of wideband frequency sub-bands, each wideband frequency sub-band having a different center frequency, wherein a bandwidth of each wideband frequency sub-band is at least 2 percent of a center frequency of the wideband frequency sub-band; detecting an interfering signal having signal energy in a portion of a respective sub-band of the wideband frequency sub-bands; deciding to discontinue use of the respective sub-band; and instructing a transmitting device transmitting the signaling to transmit subsequent signaling in any except the respective sub-band of the plurality of wideband frequency sub-bands.

Claims

1. A method of operation in a multi-frequency band system in the presence of an interference, the method comprising:

receiving signaling in a plurality of wideband frequency sub-bands, each wideband frequency sub-band having a different center frequency, wherein a bandwidth of each wideband frequency sub-band is at least 2 percent of a center frequency of the wideband frequency sub-band;

detecting an interfering signal having signal energy in a portion of a respective sub-band of the wideband frequency sub-bands;

deciding to discontinue use of the respective sub-band; and

instructing a transmitting device transmitting the signaling to transmit subsequent signaling in any except the respective sub-band of the plurality of wideband frequency sub-bands.

2. The method of claim 1 wherein the receiving step comprises:

receiving the signaling in the plurality of the wideband frequency sub-bands, wherein a symbol is encoded in the time dependence of the signaling across the plurality of the wideband frequency sub-bands, the symbol corresponding to data.

3. The method of claim 1 wherein the detecting step comprises:

estimating an error in signaling received in the respective sub-band; and

declaring the narrowband interfering signal in the respective sub-band based on the error.

4. The method of claim 1 wherein the detecting step comprises:

tracking symbol errors occurring in the respective sub-band; and

declaring the interfering signal in the respective sub-band based on the symbol errors.

5. The method of claim 4 wherein the detecting step further comprises:

estimating a probability that the symbol errors in the respective sub-band are due to the interfering signal;

wherein the declaring step comprises;

declaring the interfering signal in the respective sub-band based on the probability.

6. The method of claim 1 wherein the detecting step comprises:

determining the presence of excess signal energy within the respective sub-band during a time period when signaling is not to be received in the respective sub-band; and

declaring the narrowband interfering signal in the respective sub-band based on the presence of the excess signal energy.

7. The method of claim 1 wherein the instructing step comprises:

instructing the transmitting device to transmit the subsequent signaling in any sub-band except the respective sub-band of the plurality of wideband frequency sub-bands, replacing the respective sub-band with an additional wideband frequency sub-band.

8. The method of claim 1 wherein the instructing step comprises:

instructing the transmitting device to transmit the subsequent signaling in any sub-band except the respective sub-band of the plurality of wideband frequency sub-bands, the respective sub-band not replaced with an additional sub-band.

9. The method of claim 1 further comprising:

determining that the respective sub-band no longer includes the interfering signal; and

instructing the transmitting device to transmit the subsequent signaling in any sub-band of the plurality of ultra-wideband frequency sub-bands.

10. The method of claim 1 further comprising:

maintaining channel state information including two or more of available sub-bands, sub-bands in use, and interfered sub-bands.

11. The method of claim 10 further comprising:

updating the channel state information in response to the detecting the interference step.

12. The method of claim 11 wherein the instructing the transmitting device step comprises:

transmitting the channel state information having been updated to the transmitting device.

13. The method of claim 10 wherein the channel state information further includes one or more of a modulation type, a coding rate, a data rate and a sub-band bandwidth.

14. The method of claim 1 wherein the instructing the transmitting device step comprises:

transmitting channel state information identifying the respective sub-band as including the interfering signal to the transmitting device in the respective sub-band including the interfering signal.

15. The method of claim 14 wherein the transmitting the channel state information comprises:

transmitting a first signal in the respective sub-band including the interfering signal during a first symbol period;

transmitting a second signal in the respective sub-band including the interfering signal during a second symbol period; and

transmitting a third signal in an available sub-band during the second symbol period;

wherein the transmitting device is able to determine which sub-bands of the plurality of wideband frequency sub-bands to transmit the subsequent signaling in.

16. The method of claim 1 wherein the instructing the transmitting device step comprises:

transmitting channel state information to the transmitting device, the channel state information comprising available sub-bands out of the plurality of wideband frequency sub-bands.

17. The method of claim 1 wherein the instructing the transmitting device step comprises:

transmitting channel state information to the transmitting device, the channel state information comprising sub-bands in use out of the plurality of wideband frequency sub-bands.

18. The method of claim 1 wherein the instructing the transmitting device step comprises:

transmitting channel state information to the transmitting device, the channel state information comprising interfered sub-bands out of the plurality of wideband frequency sub-bands.

19. The method of claim 1 wherein the receiving the signaling comprises:

receiving the signaling in a plurality of ultra-wideband frequency sub-bands, wherein the bandwidth of each ultra-wideband frequency sub-band is at least 20 percent of the center frequency of the ultra-wideband frequency sub-band.

24. The method of claim 1 wherein the signaling comprises at least one symbol distributed over two or more of the plurality of wideband frequency sub-bands.

25. The method of claim 1 wherein the signaling in the plurality of wideband frequency sub-bands is from the transmitting device and together represents a communication.

20. A multi-frequency band receiver for operating in the presence of an interference, the receiver comprising:

a signal detector configured to receive signaling in a plurality of wideband frequency sub-bands, each wideband frequency sub-band having a different center frequency, wherein a bandwidth of each wideband frequency sub-band is at least 2 percent of a center frequency of the wideband frequency sub-band;

an interference detector coupled to the signal detector and configured to detect an interfering signal having signal energy in a portion of a respective sub-band of the wideband frequency sub-bands; and

an interference compensator coupled to the interference detector and configured to decide to discontinue use of the respective sub-band;

the interference compensator configured to determine that subsequent signaling is to be transmitted by a transmitting device in any sub-band except the respective sub-band of the plurality of wideband frequency sub-bands.

21. The receiver of claim 20 wherein the signal detector is configured to receive the signaling in a plurality of ultra-wideband frequency sub-bands, wherein a bandwidth of each wideband frequency sub-band is at least 20 percent of a center frequency of the ultra-wideband frequency sub-band.

22. The receiver of claim 20 wherein the signal detector is configured to receive the signaling, wherein a symbol is encoded in the time dependence of the signaling across the plurality of the wideband frequency sub-bands, the symbol corresponding to data.

26. The receiver of claim 20 wherein the signaling comprises at least one symbol distributed over two or more of the plurality of wideband frequency sub-bands.

27. The receiver of claim 20 wherein the signaling in the plurality of wideband frequency sub-bands is from the transmitting device and together represents a communication.

23. A method of communicating channel state information to a transmitting device, the method comprising:

obtaining channel configuration information, the channel configuration information indicating that a respective sub-band of a plurality of wideband frequency sub-bands includes an interfering signal having signal energy in a portion of a respective sub-band, wherein signaling occurs over the plurality of wideband frequency sub-bands between a transmitting device and a receiving device, wherein each wideband frequency sub-band has a different center frequency, wherein a bandwidth of each wideband frequency sub-band is at least 2 percent of a center frequency of the wideband frequency sub-band;

transmitting a first signal in the respective sub-band including the interfering signal during a first symbol period to the transmitting device;

transmitting a second signal in the respective sub-band including the interfering signal during a second symbol period to the transmitting device; and

transmitting a third signal in an available sub-band not presently being used for the signaling during the second symbol period to the transmitting device;

wherein the transmitting device is able to determine which sub-bands of the plurality of wideband frequency sub-bands to transmit the subsequent signaling in, based upon receipt of the first signal, the second signal and the third signal.

28. The method of claim 23 wherein the subsequent signaling comprises at least one symbol is distributed over at least two of the plurality of wideband frequency sub-bands.

29. The method of claim 23 wherein the subsequent signaling comprises signaling in the plurality of wideband frequency sub-bands from the transmitting device and together represents a communication.