Sensing wireless communications in television frequency bands
First Claim
1. A method comprising:
- sensing, with a sensing device, a signal in a range of frequencies reserved for use by television broadcast systems in broadcasting television content;
calculating, with the sensing device, an estimate of a power spectral density (PSD) for the sensed signal;
filtering, with the sensing device, the estimated PSD to remove noise and generate a filtered PSD for the sensed signal;
analyzing, with the sensing device, the filtered PSD to identify one or more candidate frequencies within the range of frequencies, wherein the one or more candidate frequencies comprise frequencies potentially in use by one or more wireless communication devices;
computing, with the sensing device, one or more test statistics for each of the one or more candidate frequencies, wherein each of the one or more test statistics define a property of the one or more candidate frequencies, and wherein the one or more test statistics include one or more of a height test statistic, a width test statistic, an area test statistic, and a mean test statistic; and
comparing, with the sensing device, the one or more test statistics to one or more thresholds to identify those of the candidate frequencies that are actively in use by the one or more wireless communication devices, wherein a particular threshold value of the one or more thresholds identifies a median or a mean of all values of the filtered PSD within a window of the filtered PSD.
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Abstract
In general, techniques are described for sensing wireless communications in television frequency bands, which may be implemented by a sensing device comprising a sensing unit, a power spectral density (PSD) estimation unit, a filter unit, a candidate selection unit, an analysis unit and a decision unit. The sensing unit senses a signal in the television frequencies bands. The PSD estimation unit calculates an estimate of a PSD for the sensed signal. The filter unit filters the estimated PSD. The candidate selection unit analyzes the filtered PSD to identify a candidate frequency representative of a potentially in use frequency. The analysis unit computes a test statistic for the candidate frequency. The decision unit compares the test statistic to a threshold to identify whether the candidate frequencies is actively in use by wireless communication devices.
13 Citations
44 Claims
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1. A method comprising:
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sensing, with a sensing device, a signal in a range of frequencies reserved for use by television broadcast systems in broadcasting television content; calculating, with the sensing device, an estimate of a power spectral density (PSD) for the sensed signal; filtering, with the sensing device, the estimated PSD to remove noise and generate a filtered PSD for the sensed signal; analyzing, with the sensing device, the filtered PSD to identify one or more candidate frequencies within the range of frequencies, wherein the one or more candidate frequencies comprise frequencies potentially in use by one or more wireless communication devices; computing, with the sensing device, one or more test statistics for each of the one or more candidate frequencies, wherein each of the one or more test statistics define a property of the one or more candidate frequencies, and wherein the one or more test statistics include one or more of a height test statistic, a width test statistic, an area test statistic, and a mean test statistic; and comparing, with the sensing device, the one or more test statistics to one or more thresholds to identify those of the candidate frequencies that are actively in use by the one or more wireless communication devices, wherein a particular threshold value of the one or more thresholds identifies a median or a mean of all values of the filtered PSD within a window of the filtered PSD. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A sensing device for sensing wireless communications comprising:
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a sensing unit that senses a signal in a range of frequencies reserved for use by television broadcast systems in broadcasting television content; a power spectral density (PSD) estimation unit that calculates an estimate of a power spectral density (PSD) for the sensed signal; at least one filter unit that filters the estimated PSD to remove noise and generate a filtered PSD for the sensed signal; a candidate selection unit that analyzes the filtered PSD to identify one or more candidate frequencies within the range of frequencies, wherein the one or more candidate frequencies comprise frequencies potentially in use by one or more wireless communication devices; one or more analysis units to compute one or more test statistics for each of the one or more candidate frequencies, wherein each of the one or more test statistics define a property of the one or more candidate frequencies, and wherein the one or more test statistics include one or more of a height test statistic, a width test statistic, an area test statistic, and a mean test statistic; and a decision unit that compares the one or more test statistics to one or more thresholds to identify those of the candidate frequencies that are actively in use by the one or more wireless communication devices, wherein a particular threshold value of the one or more thresholds identifies a median or a mean of all values of the filtered PSD within a window of the filtered PSD. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An apparatus comprising:
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means for sensing a signal in a range of frequencies reserved for use by television broadcast systems in broadcasting television content; means for calculating an estimate of a power spectral density (PSD) for the sensed signal; means for filtering the estimated PSD to remove noise and generate a filtered PSD for the sensed signal; means for analyzing the filtered PSD to identify one or more candidate frequencies within the range of frequencies, wherein the one or more candidate frequencies comprise frequencies potentially in use by one or more wireless communication devices; means for computing one or more test statistics for each of the one or more candidate frequencies, wherein each of the one or more test statistics define a property of the one or more candidate frequencies, and wherein the one or more test statistics include one or more of a height test statistic, a width test statistic, an area test statistic, and a mean test statistic; means for comparing the one or more test statistics to one or more thresholds to identify those of the candidate frequencies that are actively in use by the one or more wireless communication devices, wherein a particular threshold value of the one or more thresholds identifies a median or a mean of all values of the filtered PSD within a window of the filtered PSD. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A non-transitory computer-readable storage medium comprising instructions that cause a processor to:
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sense a signal in a range of frequencies reserved for use by television broadcast systems in broadcasting television content; calculate an estimate of a power spectral density (PSD) for the sensed signal; filter the estimated PSD to remove noise and generate a filtered PSD for the sensed signal; analyze the filtered PSD to identify one or more candidate frequencies within the range of frequencies, wherein the one or more candidate frequencies comprise frequencies potentially in use by one or more wireless communication devices; compute one or more test statistics for each of the one or more candidate frequencies, wherein each of the one or more test statistics define a property of the one or more candidate frequencies, and wherein the one or more test statistics include one or more of a height test statistic, a width test statistic, an area test statistic, and a mean test statistic; and compare the one or more test statistics to one or more thresholds to identify those of the candidate frequencies that are actively in use by the one or more wireless communication devices, wherein a particular threshold value of the one or more thresholds identifies a median or a mean of all values of the filtered PSD within a window of the filtered PSD. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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Specification