Method and apparatus for television band pilot sensing
First Claim
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1. A television white spaces availability sensor, comprising:
- a pilot tone peak search module that computes a peak signal power of a narrow frequency window centered around a designated digital television (DTV) pilot position of the output of a signal and provides an output;
a conditioned signal power estimation module that estimates an average received signal power in a wide frequency window located in a designated data portion of the signal and provides an output; and
a tone detection module that compares the output of the pilot tone peak search module with a product of the output of the conditioned signal power estimation module multiplied by a programmable power ratio to determine whether a DTV pilot tone has been detected.
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Abstract
A DTV pilot sensor generates DTV pilot tone detection decisions associated with monitored television band channels without knowledge or estimation of a noise level of the monitored channel.
19 Citations
20 Claims
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1. A television white spaces availability sensor, comprising:
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a pilot tone peak search module that computes a peak signal power of a narrow frequency window centered around a designated digital television (DTV) pilot position of the output of a signal and provides an output; a conditioned signal power estimation module that estimates an average received signal power in a wide frequency window located in a designated data portion of the signal and provides an output; and a tone detection module that compares the output of the pilot tone peak search module with a product of the output of the conditioned signal power estimation module multiplied by a programmable power ratio to determine whether a DTV pilot tone has been detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of sensing a digital television (DTV) pilot tone 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; searching a first frequency window centered around a designated DTV pilot position of a power spectrum of a received signal to locate a peak power of the narrow frequency window; estimating an average power of a second wider frequency window located in a designated data portion of the power spectrum; and comparing the peak power of the first frequency window with the estimated average power of the wider frequency window to determine whether a DTV pilot tone has been detected. - View Dependent Claims (14)
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- 15. The method as claimed in clam 13 wherein prior to searching the first frequency window the method further comprises using an interpolation filter to filter the power spectrum associated with the first frequency window.
Specification