System and method for wireless channel sensing
First Claim
1. A method of determining band availability for a WRAN network comprising:
- simultaneously receiving wirelessly analog signals within a predetermined range of frequencies, the predetermined range of frequencies comprising a plurality of frequencies;
modifying the analog signals to provide digital signals, the digital signals, the digital signals being characterized in a frequency domain;
determining a plurality of signal spectral amplitudes of the digital signals, each of the plurality of signal spectral amplitudes associated with a different frequency of the plurality of frequencies, wherein determining the plurality of signal spectral amplitudes comprises performing a time-domain to frequency-domain transform over the plurality of frequencies;
comparing the plurality of signal spectral amplitudes to reference levels at the plurality of frequencies; and
determining a band availability for wireless communication at the predetermined range of frequencies, determining band availability comprising determining whether the plurality of signal spectral amplitudes are indicative of a transmission type different from the WRAN network based on the comparing.
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Abstract
System and method for wireless channel sensing. According to an embodiment, the present invention provides a method of determining band availability for a WRAN. The method includes receiving wirelessly analog signals within a predetermined range of frequencies. The method also includes converting the analog signals to digital signals. The digital signals are characterized in a frequency domain. The method additionally includes determining a plurality of signal strength levels associated with the digital signals at a plurality of frequencies. Furthermore, the method includes comparing the plurality of signal strength levels to reference levels at the plurality of frequencies. Moreover, the method includes determining band availability for wireless communication at the predetermined range of frequencies.
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Citations
35 Claims
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1. A method of determining band availability for a WRAN network comprising:
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simultaneously receiving wirelessly analog signals within a predetermined range of frequencies, the predetermined range of frequencies comprising a plurality of frequencies; modifying the analog signals to provide digital signals, the digital signals, the digital signals being characterized in a frequency domain; determining a plurality of signal spectral amplitudes of the digital signals, each of the plurality of signal spectral amplitudes associated with a different frequency of the plurality of frequencies, wherein determining the plurality of signal spectral amplitudes comprises performing a time-domain to frequency-domain transform over the plurality of frequencies; comparing the plurality of signal spectral amplitudes to reference levels at the plurality of frequencies; and determining a band availability for wireless communication at the predetermined range of frequencies, determining band availability comprising determining whether the plurality of signal spectral amplitudes are indicative of a transmission type different from the WRAN network based on the comparing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 32, 34)
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19. A system for determining availability of wireless communication links of a first transmission system, the system comprising:
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an antenna for wirelessly receiving analog signals being within a predetermined range of frequencies, the analog signals being associated with a time-domain; a converting component for converting the analog signals to a first plurality of digital signals, the first plurality of digital signals being associated with a time domain at a predetermined range of frequencies, the predetermined frequency range including a plurality of frequencies; a transforming component for providing a second plurality of digital signals, each of the second plurality of digital signals being associated with a different frequency of the plurality of frequencies in a frequency domain, wherein the transforming component performs a time-domain to frequency domain transform over the plurality of frequencies; and a detecting component for determining wireless channel availability; wherein; the detecting component is configured to determine a plurality of signal strength levels associated with the second plurality of digital signals at a plurality of frequencies; and the detecting component is further configured to compare the plurality of signal strength levels to reference levels at the plurality of frequencies and to determine a band availability for wireless communication at the predetermined range of frequencies based on the comparing, the detecting component is further configured to determine whether the plurality of signal strength levels are indicative of a transmission type different from the first transmission system based on comparing. - View Dependent Claims (20, 21, 22, 23, 24, 33, 35)
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25. A method for determining availability of wireless communication links of a first network, the method comprising:
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receiving wirelessly analog signals within a predetermined range of frequencies, wherein the predetermined frequency range comprises a plurality of frequencies, and the analog signals are associated with a time-domain; modifying the analog signals to digital signals, the digital signals being characterized in a frequency domain, the digital signals including a first pilot signal at a first frequency of the plurality of frequencies and a second pilot signal at a second frequency of the plurality of frequencies, wherein modifying comprises performing a time-domain to frequency-domain transform over the plurality of frequencies; determining a ratio of signal strength between the first pilot signal and the second pilot signal; comparing the ratio to a predetermined threshold; and determining a band availability for wireless communication at the predetermined range of frequencies based on the comparing, determining the band availability comprising determining whether a plurality of signal spectral amplitudes derived from the time-domain to frequency-domain transform are indicative of a transmission type different from the first network based on the comparing the plurality of signal spectral amplitudes with further thresholds. - View Dependent Claims (26, 27, 28)
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29. A method for determining availability of wireless communication links of a first network, the method comprising:
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receiving wirelessly analog signals within a predetermined range of frequencies, the predetermined range of frequencies comprising a plurality of frequencies, and the analog signals being associated with a time-domain; converting the analog signals to digital signals, converting comprising performing an analog to digital conversion followed by a time-domain to frequency domain transformation over the plurality of frequencies, the digital signals being characterized in a frequency domain, the digital signals including a first pilot signal at a first frequency and a second pilot signal at a second frequency; determining a ratio of signal strength between the first pilot signal and the second pilot signal; comparing the ratio to a predetermined threshold;
determining a plurality of signal strength levels associated with the digital signals at a plurality of frequencies;determining a first band availability metric for wireless communication at the predetermined range of frequencies based on the comparing the ratio; comparing the plurality of signal strength levels to reference levels at the plurality of frequencies; determining a second band availability metric for wireless communication at the predetermined range of frequencies based on the comparing the plurality of signal strength levels; determining a third band availability metric based on the first and second band availability metrics; and determining whether a plurality of signal spectral amplitudes derived from the time-domain to frequency-domain transform are indicative of a transmission type different from the first network based on the determining the first, second and third band availability metric. - View Dependent Claims (30, 31)
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Specification