Distinguishing and communicating between white space devices transmitting ATSC-compatible signals
First Claim
1. A method to differentiate a white space signal from a licensed Advanced Television Systems Committee (ATSC) signal, said method comprising:
- modifying a waveform of said white space signal, said white space signal having a pilot signal and being an unlicensed ATSC signal, and said modifying comprising;
shifting a frequency of said pilot signal outside of at least one frequency range associated with said licensed ATSC signal.
1 Assignment
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Accused Products
Abstract
White space signals are differentiated from licensed ATSC signals through modification of a waveform of the white space signal. White space signals may be modified by shifting the ATSC-compatible waveform so that the pilot frequency of the white space signal is at a location outside of the frequency range associated with the pilot frequency in a licensed ATSC signal or embedding a watermark signal into said ATSC-like white space signals. White space device transmitters generate the signals with these modifications and white space receivers are equipped to detect whether a pilot exists in the standard licensed pilot frequencies. Based on these differences, white space devices can better operate without interfering with licensed ATSC transmission. Additionally, the modification techniques may be used to embed data in the white space signal that may be used to communicate connection data or networking data to other white space devices.
17 Citations
26 Claims
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1. A method to differentiate a white space signal from a licensed Advanced Television Systems Committee (ATSC) signal, said method comprising:
modifying a waveform of said white space signal, said white space signal having a pilot signal and being an unlicensed ATSC signal, and said modifying comprising; shifting a frequency of said pilot signal outside of at least one frequency range associated with said licensed ATSC signal. - View Dependent Claims (2, 3, 4, 5)
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6. A white space device comprising:
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a memory unit; and at least one processor coupled to said memory unit;
said at least one processor being configured;to modify a waveform of white space signals, said white space signal having a pilot signal and being an unlicensed Advanced Television Systems Committee (ATSC) signal, and said modified waveform comprising; a pilot signal having a frequency shifted outside of at least one frequency range associated with a licensed ATSC signals. - View Dependent Claims (7, 8)
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9. A non-transitory computer-readable medium including program code stored thereon, comprising:
a non-transitory computer-readable medium having program code recorded thereon, the program code comprising; program code to modify a waveform of a white space signal, said white space signal having a pilot signal and being an unlicensed Advanced Television Systems Committee (ATSC) signal, and said program code to modify comprising; program code to shift a frequency of said pilot signal outside of at least one frequency range associated with a licensed ATSC signal; and program code to transmit said modified waveform. - View Dependent Claims (10, 11, 12, 13)
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14. A system to differentiate a white space signal from a licensed Advanced Television Systems Committee (ATSC) signal, said system comprising:
means for modifying a waveform of said white space signal, said white space signal having a pilot signal and being an unlicensed ATSC signal, and said means for modifying comprising; means for shifting a frequency of said pilot signal outside of at least one frequency range associated with said licensed ATSC signal. - View Dependent Claims (15, 16)
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17. A method for distinguishing between a white space signal and an licensed Advanced Television Systems Committee (ATSC) signal, said method comprising:
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detecting a modified waveform in a white space signal having a pilot signal, and said modified waveform comprising; a pilot signal having a frequency outside at least one frequency range associated with said licensed ATSC signal;
orat least one quiet period within said white space signal; and determining said white space signal is an unlicensed ATSC signal based at least in part on said modified waveform. - View Dependent Claims (18)
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19. A white space device comprising:
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a memory unit; and at least one processor coupled to said memory unit, said at least one processor being configured; to detect a modified waveform in white space signal having a pilot signal, said modified waveform comprising; a pilot signal having a frequency outside at least one frequency range associated with a licensed Advanced Television Systems Committee (ATSC) signal; at least one quiet period within said white space signal; and to determine said white space signal is an unlicensed ATSC signal in response to detection of said modified waveform. - View Dependent Claims (20)
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21. A non-transitory computer-readable medium including program code stored thereon, comprising:
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a non-transitory computer-readable medium having program code recorded thereon, said program code comprising; program code to detect a modified waveform in whitespace signal having a pilot signal, wherein said modified waveform comprising; a pilot signal having a frequency outside at least one frequency range associated with a licensed Advanced Television Systems Committee (ATSC) signal;
orat least one quiet period within said whitespace signal; and program code-to determine said white space signal is an unlicensed ATSC signal in response to detection of said modified waveform. - View Dependent Claims (22)
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23. A system for distinguishing between a white space signal and a licensed Advanced Television Systems Committee (ATSC) signal, said system comprising:
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means for detecting a modified waveform in said white space signal having a pilot signal, wherein said modified waveform comprises; a pilot signal having a frequency outside at least one frequency range associated with said licensed ATSC signal;
orat least one quiet period within said white space signal; and means-for determining said white space signal is an unlicensed ATSC signal in response to detection of said modified waveform.
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24. A method for establishing communication between at least two white space devices, said method comprising:
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receiving a white space signal having a pilot signal at a first white space device, said white space signal being an unlicensed Advanced Television Systems Committee (ATSC) signal; detecting modulation of a watermark signal embedded in said white space signal; demodulating said watermark signal into communication data; and establishing communication with a second white space device based on said communication data. - View Dependent Claims (25)
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26. A method for establishing communication between at least two white space devices, said method comprising:
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receiving white space signal at a first white space device, said white space signal being an unlicensed Advanced Television Systems Committee (ATSC) signal; searching for two tones embedded in said white space signal; detecting an active one of said two tones; decoding said white space signal into a prefix free code based on said detected active one of said two tones; and establishing communication with a second white space device using said prefix free code.
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Specification