Method and apparatus for acquiring wide-band pseudorandom noise encoded waveforms
First Claim
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1. A method for transmitting a signal, comprising:
- decomposing a signal having a signal bandwidth into at least first and second sub-band signals, each of the first and second sub-band signals having a respective sub-band signal bandwidth included within the signal bandwidth;
transmitting each of the first and second sub-band signals;
receiving each of the first and second sub-band signals; and
combining each of the received first and second sub-band signals to form a composite signal.
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Abstract
The method and apparatus of the present invention is directed to architectures for signal processing, such as for performing analog-to-digital and digital-to-analog conversions, in which the source signal is decomposed into subband signals by an analysis filter, processed, and the processed subband signals combined to form a reconstructed signal that is representative of the source signal.
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Citations
54 Claims
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1. A method for transmitting a signal, comprising:
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decomposing a signal having a signal bandwidth into at least first and second sub-band signals, each of the first and second sub-band signals having a respective sub-band signal bandwidth included within the signal bandwidth;
transmitting each of the first and second sub-band signals;
receiving each of the first and second sub-band signals; and
combining each of the received first and second sub-band signals to form a composite signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
encoding the first and second sub-band signals; and
wherein the receiving step comprises; decoding the received first and second sub-band signals.
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3. The method of claim 2 wherein the first and second sub-band signals are encoded simultaneously and the received first and second sub-band signals are decoded simultaneously.
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4. The method of claim 1, wherein the decomposing step comprises:
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passing the signal through an analysis filter, and wherein the combining step comprises; passing each of the first and second sub-band signals through a synthesis filter.
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5. The method of claim 1, wherein the transmitting step comprises:
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emitting the at least first and second sub-band signals from a corresponding plurality of signal sources; and
wherein the receiving step comprises; receiving the transmitted at least first and second sub-band signals with a corresponding plurality of signal receptors.
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6. The method of claim 1, further comprising:
converting the first and second sub-band signals from a digital form to an analog form.
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7. The method of claim 1, further comprising, before the combining step:
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converting the received first and second sub-band signals from a radio frequency to a baseband frequency; and
converting the baseband frequency first and second sub-band signals from an analog format to a digital format.
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8. The method of claim 1, wherein the receiving step comprises:
correlating the received first and second sub-band signals with a replica of the transmitted first and second sub-band signals.
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9. The method of claim 1, wherein the receiving step comprises:
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determining whether a respective noise component of the first and second sub-band signals is above a signal level; and
when a noise component is above the signal level, rejecting the corresponding sub-band signal.
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10. A system for transmitting a signal, comprising:
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means for decomposing a signal having a signal bandwidth into at least first and second sub-band signals, each of the first and second sub-band signals having a respective sub-band signal bandwidth included within the signal bandwidth;
means for transmitting each of the first and second sub-band signals;
means for receiving each of the first and second sub-band signals; and
means for combining each of the received first and second sub-band signals to form a composite signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
an analysis filter and wherein the combining means comprises a synthesis filter.
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12. The system of claim 11, wherein the analysis and synthesis filters are perfect reconstruction filters.
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13. The system of claim 10, wherein the transmitting means comprises encoding means for encoding, prior to transmission, the first and second sub-band signals and wherein the receiving means comprises decoding means for decoding the received first and second sub-band signals.
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14. The system of claim 13 wherein the first and second sub-band signals are encoded simultaneously and the received first and second sub-band signals are decoded simultaneously.
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15. The system of claim 10, wherein the transmitting means comprises a plurality of signal sources corresponding to the at least a first and second sub-band signals and wherein the receiving means comprises a plurality of signal receptors corresponding to the received at least first and second sub-band signals.
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16. The system of claim 10, further comprising:
converting means for converting the first and second sub-band signals from one of analog to digital or from digital to analog.
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17. The system of claim 10, further comprising:
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down converting means for converting the received first and second sub-band signals from a radio frequency to a baseband frequency; and
analog-to-digital converting means for converting the baseband frequency first and second sub-band signals from an analog format to a digital format.
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18. The system of claim 10, wherein the receiving means comprises:
correlating means for correlating the received first and second sub-band signals with a replica of the transmitted first and second sub-band signals.
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19. The system of claim 10, wherein the receiving means comprises:
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means for determining whether a respective noise component of the first and second sub-band signals is above a selected level; and
means for rejecting at least one of the first or second sub-band signal when the respective noise component is above the selected level.
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20. A system for signal transmission, comprising:
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at least one analysis filter operable to decompose a signal having a signal bandwidth into at least first and second sub-band signals, each of the first and second sub-band signals having a respective sub-band signal bandwidth included within the signal bandwidth; and
at least one transmitter operable to transmit independently each of the first and second sub-band signals. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
at least one signal receptor operable to receive each of the first and second sub-band signals; and
at least one synthesis filter operable to combine each of the received first and second sub-band signals to form a composite signal.
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22. The system of claim 21, further comprising:
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at least one encoder operable to encode, before transmission, the first and second sub-band signals; and
at least one decoder operable to decode the received first and second sub-band signals.
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23. The system of claim 22 wherein the first and second sub-band signals are encoded simultaneously and the received first and second sub-band signals are decoded simultaneously.
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24. The system of claim 21, further comprising:
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a down converter operable to convert the received first and second sub-band signals from a radio frequency to a baseband frequency; and
an analog-to-digital converter operable to convert the baseband frequency first and second sub-band signals from an analog format to a digital format.
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25. The system of claim 21, further comprising:
a correlator operable to correlate the received first and second sub-band signals with a replica of the transmitted first and second sub-band signals.
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26. The system of claim 21, further comprising:
a noise reducing quantizer that, in a first mode, is operable to determine whether a respective noise component of the first and second sub-band signals is above a signal level and, in a second mode, is operable to reject the corresponding sub-band signal when a noise component is above the signal level.
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27. The system of claim 20, wherein the first and second sub-band signals are digital and further comprising:
a digital-to-analog converter operable to convert the first and second sub-band signals to an analog format.
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28. A method for transmitting a signal, comprising:
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decomposing a signal having a signal bandwidth into at least first and second sub-band signals, each of the first and second sub-band signals having a respective sub-band signal bandwidth included within the signal bandwidth and transmitting separately each of the first and second sub-band signals. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
receiving each of the first and second sub-band signals; and
combining each of the first and second sub-band signals to form a composite signal.
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30. The method of claim 29, wherein the transmitting step comprises:
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encoding the first and second sub-band signals; and
wherein the receiving step comprises; decoding the received first and second sub-band signals.
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31. The method of claim 30, wherein the first and second sub-band signals are encoded simultaneously and the received first and second sub-band signals are decoded simultaneously.
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32. The method of claim 29, wherein the transmitting step comprises:
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emitting the at least a first and second sub-band signals from a corresponding plurality of signal sources; and
wherein the receiving step comprises; receiving the transmitted at least a first and second sub-band signals with a corresponding plurality of signal receptors.
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33. The method of claim 29, further comprising:
converting the first and second sub-band signals from an analog format to a digital format.
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34. The method of claim 29, further comprising, before the combining step:
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converting the received first and second sub-band signals from a radio frequency to a baseband frequency; and
converting the baseband frequency first and second sub-band signals from an analog format to a digital format.
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35. The method of claim 29, wherein the receiving step comprises:
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determining whether a respective noise component of the first and second sub-band signals is above a selected level; and
when a noise component is above the selected level, rejecting the corresponding sub-band signal.
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36. A method for receiving transmitted first and second sub-band signals, the transmitted first and second sub-band signals having respective first and second sub-band signal bandwidths and being components of a signal having a signal bandwidth that includes the first and second signal bandwidths, comprising:
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receiving independently each of the first and second sub-band signals; and
combining each of the first and second sub-band signals to form a composite signal. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45)
decomposing the signal into the first and second sub-band signals; and
transmitting the first and second sub-band signals.
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38. The method of claim 37, wherein the decomposing step comprises:
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passing the signal through an analysis filter; and
wherein the combining step comprises; passing each of the first and second sub-band signals through a synthesis filter.
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39. The method of claim 37, wherein the transmitting step comprises:
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emitting the at least a first and second sub-band signals from a corresponding plurality of signal sources; and
wherein the receiving step comprises; receiving the transmitted at least a first and second sub-band signals with a corresponding plurality of signal receptors.
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40. The method of claim 37, further comprising:
converting the first and second sub-band signal segments from digital to analog.
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41. The method of claim 37, further comprising, before the combining step:
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converting the received first and second sub-band signals from a radio frequency to a baseband frequency; and
converting the baseband frequency first and second sub-band signals from an analog format to a digital format.
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42. The method of claim 37, wherein the transmitting step comprises:
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encoding the first and second sub-band signals; and
wherein the receiving step comprises; decoding the received first and second sub-band signals.
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43. The method of claim 37 wherein the first and second sub-band signals are encoded simultaneously and the received first and second sub-band signals are decoded simultaneously.
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44. The method of claim 37, wherein the receiving step comprises:
correlating the received first and second sub-band signals with a replica of the transmitted first and second sub-band signals.
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45. The method of claim 37, wherein the receiving step comprises:
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determining whether a respective noise component of the first and second sub-band signals is above a selected level; and
when a noise component is above the selected level rejecting the corresponding sub-band signal.
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46. A system for receiving transmitted first and second sub-band signals, the transmitted first and second sub-band signals having respective first and second sub-band signal bandwidths and being components of a signal having a signal bandwidth that includes the first and second signal bandwidths, comprising:
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at least one signal receptor operable to receive separately each of the first and second sub-band signals; and
at least one synthesis filter operable to combine each of the first and second sub-band signals to form a composite signal. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54)
at least one analysis filter operable to decompose the signal into the first and second sub-band signals; and
at least signal emitter operable to transmit the first and second sub-band signals.
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48. The system of claim 47, further comprising:
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a plurality of encoders operable to encode the first and second sub-band signals; and
a plurality of decoders operable to decode the received first and second sub-band signals.
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49. The system of claim 48 wherein the first and second sub-band signals are encoded simultaneously and the received first and second sub-band signals are decoded simultaneously.
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50. The system of claim 47, wherein the at least one signal emitter comprises a plurality of transmitters and the at least one signal receptor comprises a plurality of antennas.
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51. The system of claim 47, further comprising:
a plurality of digital-to-analog converters operable to convert the first and second sub-band signals from digital to analog.
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52. The system of claim 47, further comprising:
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a plurality of down converters operable to convert the received first and second sub-band signals from a radio frequency to a baseband frequency; and
a plurality of analog-to-digital converters operable to convert the baseband frequency first and second sub-band signals from an analog format to a digital format.
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53. The system of claim 47, further comprising:
a plurality of correlators operable to correlate the received first and second sub-band signals with a replica of the transmitted first and second sub-band signals.
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54. The system of claim 47, further comprising:
a noise reducing quantizer operable in a first mode to determine a respective noise component of a sub-band signal is above a selected level and in a second mode to reject the sub-band signal when the respective noise component of the sub-band signal is above the selected level.
Specification