Method and apparatus for distributed polyphase spread spectrum communications
First Claim
1. A method of communication comprising the steps of:
- polyphase channelizing a signal;
determining available spectrum in an observed frequency range having a noise floor based on cyclostationary detection of polyphase users below the noise floor; and
distributing the polyphase channelized signal among discontiguous portions of the available spectrum.
6 Assignments
0 Petitions
Accused Products
Abstract
Methods and apparatus are provided for distributed polyphase spread spectrum communication and non-contiguous spectrum underlay. The method includes polyphase channelizing a direct sequence spread spectrum (DSSS) signal, determining available spectrum in an observed frequency range having a noise floor based on detection of polyphase users below the noise floor, distributing the polyphase channelized signal among the available spectrum, and interference mitigation using a combination of standard signal detection and cyclostationary feature detection methods. The apparatus includes: a first processor adapted to polyphase channelize a code division multiple access (CDMA) spectrum and a digitized RF bandwidth containing a discontiguous polyphase waveform distribution; a second processor adapted to detect occupied bands, interferers and polyphase users in a spectrum and determine discontiguous frequency opportunities based on the detected interferers and polyphase users; and a third processor adapted to allocate the polyphase channelized CDMA spectrum among available spectrum based on the discontiguous frequency opportunities.
20 Citations
32 Claims
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1. A method of communication comprising the steps of:
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polyphase channelizing a signal; determining available spectrum in an observed frequency range having a noise floor based on cyclostationary detection of polyphase users below the noise floor; and distributing the polyphase channelized signal among discontiguous portions of the available spectrum. - View Dependent Claims (2, 3, 4, 5)
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6. A method of communication comprising the steps of:
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polyphase channelizing a signal; determining available spectrum in an observed frequency range having a noise floor based on detection of polyphase users below the noise floor by detecting at least one of occupied bands, interferers, and polyphase users in the observed frequency range using cyclostationary feature detection, determining a total number of channels available within the observed frequency range based on detected occupied bands, interferers, and polyphase users, and and determining an aggregate bandwidth based on the total number of channels available within the observed frequency range; and distributing the polyphase channelized signal among the available spectrum.
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7. A method of communication comprising the steps of:
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polyphase channelizing a signal by determining a number of channelized filters based on the total number of channels; and
wherein said distributing step comprises the step of distributing the channelized filters into available spectrum;determining available spectrum in an observed frequency range having a noise floor based on detection of polyphase users below the noise floor; and distributing the polyphase channelized signal among the available spectrum by applying discontiguous polyphase channel sounding to the observed frequency range, and mitigating wide band dispersion effects based on the channel sounding. - View Dependent Claims (8, 9)
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10. A method of communication comprising the steps of:
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polyphase channelizing a signal; determining available spectrum in an observed frequency range having a noise floor based on detection of polyphase users below the noise floor; and distributing the polyphase channelized signal among the available spectrum by allocating the polyphase channelized signal among non-contiguous available spectrum.
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11. A method of communication comprising the steps of:
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polyphase channelizing a signal; determining available spectrum in an observed frequency range having a noise floor based on detection of polyphase users below the noise floor; and distributing the polyphase channelized signal among the available spectrum; up-converting the distributed polyphase channelized signal; and transmitting the up-converted signal by transmitting a discontiguous spectrum access control signal.
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12. A method of communication comprising the steps of:
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polyphase channelizing a signal; determining available spectrum in an observed frequency range having a noise floor based on detection of polyphase users below the noise floor; distributing the polyphase channelized signal among the available spectrum; down-converting an analog radio frequency (RF) transmission having discontiguous polyphase waveform distribution of an original DSSS signal; and digitizing the down-converted RF transmission. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A spread spectrum radio comprising:
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a signal processor configured to polyphase channelize a code division multiple access (CDMA) spectrum and a digitized RF bandwidth containing a discontiguous polyphase waveform distribution; a signal detector configured to detect occupied bands, interferers and polyphase users in a spectrum and determine discontiguous frequency opportunities based on the detected interferers and polyphase users; and a signal distributor configured to allocate the polyphase channelized CDMA spectrum among available spectrum based on the discontiguous frequency opportunities. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. A digital radio comprising:
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a first processor configured to polyphase channelize a CDMA spectrum; a second processor configured to determine available spectrum based on non-linear signal processing of an observed RF spectrum, said second processor detecting occupied bands, interferers, and polyphase users above and below a noise floor a third processor configured to allocate the channelized spectrum from said first processor among the available spectrum; a fourth processor configured to up-convert the allocated spectrum from said third processor to an RF transmit signal and down-convert RF received signals to digitized RF bandwidth; and a fifth processor configured to polyphase channelize the digitized RF bandwidth from said fourth processor, cancel interference based on detected interferers from said second processor, and reconstruct an original CDMA spectrum. - View Dependent Claims (32)
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Specification