White space spectrum sensor for television band devices
First Claim
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1. A television band device, comprising:
- DTV pilot signal detection logic that searches for a DTV pilot signal in a smoothed power spectrum derived from a television channel signal frequency translated to a television channel signal centered at an intermediate frequency and generates DTV pilot signal detection decisions associated with the monitored television channel;
wireless microphone detection logic that searches for wireless microphone or narrowband signals in the smoothed power spectrum and generates wireless microphone detection decisions associated with the monitored television channel; and
a sensing manager that receives the DTV pilot signal detection decisions and the wireless microphone detection decisions and analyzes at least one the respective decisions to determine whether the monitored television channel is available white space.
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Abstract
A television band device has DTV pilot signal detection logic that generates DTV pilot signal detection decisions associated with a monitored television channel. A wireless microphone detection logic generates wireless microphone detection decisions associated with the monitored television channel. A sensing manager receives DTV pilot signal detection decisions and the wireless microphone detection decisions and analyzes at least one the respective decisions to determine whether the monitored television channel is available white space.
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Citations
25 Claims
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1. A television band device, comprising:
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DTV pilot signal detection logic that searches for a DTV pilot signal in a smoothed power spectrum derived from a television channel signal frequency translated to a television channel signal centered at an intermediate frequency and generates DTV pilot signal detection decisions associated with the monitored television channel; wireless microphone detection logic that searches for wireless microphone or narrowband signals in the smoothed power spectrum and generates wireless microphone detection decisions associated with the monitored television channel; and a sensing manager that receives the DTV pilot signal detection decisions and the wireless microphone detection decisions and analyzes at least one the respective decisions to determine whether the monitored television channel is available white space. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A television band white space sensor, comprising:
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a first down converter circuit that digitizes and down converts a radio frequency front end output television channel signal to a television channel signal centered at an intermediate frequency; a Fast Fourier Transform that receives the television channel signal centered at the intermediate frequency and transforms it to a complex serial output signal; a spectral smoothing filter that averages the complex serial output signal to compute a smoothed power spectrum in serial mode; DTV pilot signal detection logic that receives the smoothed power spectrum, searches the smoothed power spectrum for a DTV pilot signal and outputs DTV pilot signal detection decisions; wireless microphone detection logic that receives the smoothed power spectrum, searches the smoothed power spectrum for a wireless microphone or other narrowband signal and outputs wireless microphone detection decisions; and a sensing manager that receives the respective detection decisions from the DTV pilot signal detection logic and the wireless microphone detection logic and analyzes at least one of the respective detection decisions to determine whether the radio frequency front end is tuned to a white space television channel. - View Dependent Claims (9, 10)
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11. A method of sensing a white space in a television band, comprising:
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selecting a television channel to sense; scanning a television channel signal frequency translated to a signal centered at an intermediate frequency to detect a DTV pilot signal; if a DTV pilot signal is detected, selecting a next television signal to sense; else, for a predetermined period of time repeatedly selecting the television channel and scanning the signal centered at the intermediate frequency to detect a wireless microphone or other narrowband signal; and if the wireless microphone or other narrowband signal is not detected at least a predetermined number of times during the predetermined period of time, confirming the selected television channel to be white space. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of sensing a white space in a television band, comprising:
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tuning a radio frequency front end to a frequency associated with a television channel in the television band; converting output from the radio frequency front end to a signal centered at an intermediate frequency; scanning the signal centered at the intermediate frequency to detect a DTV pilot signal; if a DTV pilot signal is detected, tuning the radio frequency front end to a frequency associated with another television channel in the television band; else, scanning the signal centered at the intermediate frequency for a wireless microphone or other narrowband signal; and
, for a predetermined period of time repeatedly tuning the radio frequency front end to the frequency associated with the television channel and scanning the signal centered at the intermediate frequency to detect the wireless microphone or other narrowband signal; and
if a wireless microphone or other narrowband signal is detected, tuning the radio frequency front end to a frequency associated with another television channel in the television band. - View Dependent Claims (25)
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Specification