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

• US 7,403,575 B2
• Filed: 02/20/2003
• Issued: 07/22/2008
• 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.
• Primary Examiner(s): Ahn; Sam K
• Application Number:
  US10/371,074
• Publication Number:
  US 20040028011A1
• Time in Patent Office: 1,979 Days
• Field of Search: 375/346, 375/148, 375/146, 375/144, 375/358, 455/69, 370/330
• US Class Current: 375/308
• 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. An integrated circuit comprising:

an up-converter comprising;

a first filter having N outputs, where each output provides a signal shifted in phase from one another;

a second filter having N outputs, where each output provides a signal shifted in phase from one another;

an oscillator providing 2 times N outputs, where the 2 times N outputs provide N pairs of quadrature signals and where each pair of the quadrature signals are shifted in phase from one another;

a first plurality of mixers, each mixer receiving one of the N outputs from the first filter and one of the 2 times N outputs from the oscillator;

a second plurality of mixers, each mixer receiving one of the N outputs from the second filter and one of the 2 times N outputs from the oscillator, wherein an output of each of the first plurality of mixers is combined with an output of the second plurality of mixers; and

a plurality of parallel-to-serial converters, each parallel-to-serial converter receiving a bit from each of the combined outputs of the mixers and providing a serial output.

2. The integrated circuit of claim 1 wherein the parallel-to-serial converter comprises a plurality of registers coupled as a shift register.

3. The integrated circuit of claim 1 wherein the parallel-to-serial converter comprises a serializer.

4. The integrated circuit of claim 1 wherein the plurality of parallel-to-serial converters are coupled to a digital-to-analog converter.

5. The integrated circuit of claim 1 wherein the oscillator is a numerically controlled oscillator.

6. The integrated circuit of claim 5 wherein the numerically controlled oscillator comprises a plurality of lookup tables, each lookup table comprising a plurality of entries.

7. The integrated circuit of claim 1 wherein the first filter and the second filter are each a multi-tap finite-impulse-response filter.

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 both 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.

8. A method of up-converting a signal comprising:

receiving in-phase and quadrature versions of a signal;

decomposing the in-phase version of the signal into a first plurality of signals, each phase shifted from each other;

decomposing the quadrature version of the signal into a second plurality of signals, each phase shifted from each other;

multiplying each of the first plurality of signals with a third plurality of signals to generate a fourth plurality of signals;

multiplying each of the second plurality of signals with a fifth plurality of signals to generate a sixth plurality of signals;

adding each of the fourth plurality of signals with a corresponding one of the sixth plurality of signals to generate a seventh plurality of signals;

serializing a plurality of most significant bits of the seventh plurality of signals to generate an eighth signal; and

serializing a plurality of least significant bits of the seventh plurality of signals to generate a ninth signal.

9. The method of claim 8 wherein the serializing of the plurality of most significant bits of the seventh plurality of signals is done by a serializer circuit.

10. The method of claim 9 wherein the serializer circuit comprises a plurality of registers configured as a shift register.

11. The method of claim 9 wherein the third and fifth plurality of signals are generated by a numerically controlled oscillator.

12. The method of claim 11 wherein the numerically controlled oscillator comprises a plurality of lookup tables.

13. The method of claim 9 wherein each of the third plurality of signals is approximately in quadrature with one of the fifth plurality of signals.

14. The method of claim 8 further comprising:

converting the eighth signal to an analog signal;

filtering the analog signal; and

applying the filtered analog signal to an antenna.

27. The method of claim 8 further comprising:

serializing a plurality of intermediate bits of the seventh plurality of signals to generate a tenth signal.

21. An integrated circuit including an up-converter comprising:

a first polyphase filter having a first plurality of outputs providing a first plurality of output signals, where each of the first plurality of output signals are shifted in phase from one another;

a second polyphase filter having a second plurality of outputs providing a second plurality of output signals, where each of the second plurality of output signals are shifted in phase from one another;

an oscillator having a third plurality of outputs providing a third plurality of output signals, where each of the third plurality of output signals are shifted in phase from one another, the oscillator further having a fourth plurality of outputs providing a fourth plurality of output signals, where each of the fourth plurality of output signals are shifted in phase from one another, and where each of the fourth plurality of output signals are in quadrature with a corresponding one of the third plurality of output signals;

a first plurality of mixers, each of the first plurality of mixers coupled to one of the first plurality of outputs from the first polyphase filter and one of the third plurality of outputs from the oscillator;

a second plurality of mixers, each of the second plurality of mixers coupled to one of the second plurality of outputs from the second polyphase filter and one of the fourth plurality of outputs from the oscillator;

a plurality of adders, each coupled to an output of one of the first plurality of mixers and an output from one of the second plurality of mixers; and

a plurality of parallel-to-serial converters, each parallel-to-serial converter coupled to an output of each of the plurality of adders.

22. The integrated circuit of claim 21 wherein the parallel-to-serial converter comprises a plurality of registers coupled as a shift register.

23. The integrated circuit of claim 21 wherein the plurality of parallel-to-serial converters are coupled to a digital-to-analog converter.

24. The integrated circuit of claim 21 wherein the oscillator is a numerically controlled oscillator.

25. The integrated circuit of claim 24 wherein the numerically controlled oscillator comprises a plurality of lookup tables, each lookup table comprising a plurality of entries.

26. The integrated circuit of claim 21 wherein the first polyphase filter and the second polyphase filter each comprise a multi-tap finite-impulse-response filter.