Method and apparatus for adapting signaling to maximize the efficiency of spectrum usage for multi-band systems in the presence of interference

• US 20040028011A1
• Filed: 02/20/2003
• Published: 02/12/2004
• Est. Priority Date: 09/26/2001
• Status: Active Grant

• Current Assignee: General Atomics, Inc.
• Original Assignee: General Atomics, Inc.
• Inventors: Ellis, Jason L., Rogerson, Gerald D., Lin, Susan C., Gehring, Stephan W.
• Granted Patent: US 7,403,575 B2
• Time in Patent Office: Days
• US Class Current: 370/330
• CPC Class Codes: H04B 1/7163 using impulse radio
• CPC Class Codes: H04B 1/719 Interference-related aspects
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/28 with simultaneous transmission of different frequencies each representing one code element
• CPC Class Codes: H04L 5/06 the signals being represented by different frequencies combined with time-division multiplexing H04L5/26

Abstract

A method and apparatus for operation in a multi-frequency band wideband system in the presence of an interference, the method comprising the steps: 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; modifying at least one of a center frequency and a bandwidth of the respective sub-band in order to operate in the presence of the interfering signal; and instructing a transmitting device transmitting the signaling to transmit subsequent signaling accounting for the modification of the center frequency of the respective sub-band.

Claims

1. A method of operation in a multi-frequency band wideband 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;

modifying at least one of a center frequency and a bandwidth of the respective sub-band in order to operate in the presence of the interfering signal; and

instructing a transmitting device transmitting the signaling to transmit subsequent signaling accounting for the modification of the center frequency of the respective sub-band.

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 modifying step comprises:

modifying the center frequency and the bandwidth of the respective band in order to create a modified sub-band located in frequency between an adjacent sub-band and a side of the interfering signal; and

creating a new sub-band having a center frequency and a bandwidth such that the new sub-band is located in frequency between another side of the interfering signal and another adjacent signal.

4. The method of claim 3 wherein the instructing step comprises:

instructing the transmitting device to transmit the subsequent signaling accounting for the modifying and creating steps, such that the respective sub-band is replaced by the modified sub-band and the new sub-band, the interfering signal located in frequency therebetween.

5. The method of claim 4 wherein a throughput of the subsequent signaling does not change relative to a throughput of the signaling prior to the detecting step.

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

modifying the center frequency and the bandwidth of the respective band in order to create a modified sub-band located in frequency between an adjacent sub-band and a side of the interfering signal;

creating a new sub-band having a center frequency and a bandwidth such that the new sub-band is located in frequency between another side of the interfering signal and another adjacent signal; and

modifying a bandwidth of each of non-interfered sub-bands of the plurality of wideband frequency sub-bands to create a new plurality of wideband frequency sub-bands.

7. The method of claim 6 wherein the instructing step comprises:

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

8. The method of claim 7 wherein a throughput of the subsequent signaling does not change relative to a throughput of the signaling prior to the detecting step.

9. The method of claim 1 wherein the modifying step comprises:

shifting a center frequency of each of the plurality of wideband frequency sub-bands in frequency such that the interfering signal is located in frequency in between the respective sub-band the an adjacent sub-band.

10. The method of claim 9 wherein the instructing step comprises:

instructing the transmitting device to transmit the subsequent signaling in the plurality of wideband frequency sub-bands having been shifted in frequency.

11. The method of claim 10 wherein a throughput of the subsequent signaling does not change relative to a throughput of the signaling prior to the detecting step.

12. The method of claim 1 wherein the modifying step comprises:

reducing the bandwidth of the respective band in order to create a modified sub-band not including the interfering signal.

13. The method of claim 12 wherein the instructing step comprises:

instructing the transmitting device to transmit the subsequent signaling accounting for the reducing step.

14. The method of claim 13 wherein a throughput of the subsequent signaling does not change relative to a throughput of the signaling prior to the detecting step.

15. The method of claim 1 wherein the modifying step comprises:

modifying the center frequency and the bandwidth of the respective band in order to create a modified sub-band located in frequency between an adjacent sub-band and a side of the interfering signal;

modifying a center frequency and a bandwidth of the adjacent sub-band while not modifying a center frequency and a bandwidth of other non-interfered sub-bands of the plurality of wideband frequency sub-bands.

16. The method of claim 15 wherein the instructing step comprises:

instructing the transmitting device to transmit the subsequent signaling accounting for the modifying steps.

17. The method of claim 16 wherein a throughput of the subsequent signaling does not change relative to a throughput of the signaling prior to the detecting step.

18. The method of claim 1 further comprises:

modifying, in response to the first modifying step, at least one of a center frequency and a bandwidth of at least one of other non-interfered sub-bands of the plurality of wideband frequency sub-bands.

19. The method of claim 18 further comprising:

creating an additional sub-band having a center frequency and a bandwidth accounting for the first and second modifying steps.

20. 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 a center frequency of the ultra-wideband frequency sub-band.

21. A multi-frequency band wideband 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 modify at least one of a center frequency and a bandwidth of the respective sub-band in order to operate in the presence of the interfering signal;

the interference compensator configured to determine that subsequent signaling to be transmitted from a transmitting device is to be transmitted to account for the modification of the center frequency of the respective sub-band.

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

23. The receiver of claim 21 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.