LOW SINR BACKSCATTER COMMUNICATIONS SYSTEM AND METHOD
First Claim
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1. A system, comprising:
- an illumination source configured to radiate an illuminating signal;
a backscatter communication device (BCD) configured to re-modulate the illuminating signal received from the illumination source with message data;
wherein the BCD is configured to further modify the re-modulated illuminating signal so that the re-modulated illuminating waveform varies as to a plurality of frame coding parameters within defined time frames as specified by a defined frame coding scheme (FCS), where the plurality of frame coding parameters is selected from a group that includes frequency, time delay, and phase;
wherein the BCD is configured to re-transmit the re-modulated illuminating signal as modified in accordance with the FCS to the illumination source or other intended recipient; and
,wherein the illumination source or other intended recipient is configured to receive the re-transmitted signal from the BCD, synchronously reverse the modifications made to the re-transmitted signal by the BCD according to the FCS for each received frame of the re-transmitted signal, and demodulate the re-transmitted signal to extract the message data therefrom.
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Abstract
A method and system for a device to embed a low signal to interference plus noise ratio (SINR) communications signal into the backscatter of an illuminating signal. The illuminating signal may be acoustic or electromagnetic (EM) such as radio frequency (RF), light, or infrared (IR). The embedded communications signal may be recovered at a desired receiver.
116 Citations
20 Claims
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1. A system, comprising:
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an illumination source configured to radiate an illuminating signal; a backscatter communication device (BCD) configured to re-modulate the illuminating signal received from the illumination source with message data; wherein the BCD is configured to further modify the re-modulated illuminating signal so that the re-modulated illuminating waveform varies as to a plurality of frame coding parameters within defined time frames as specified by a defined frame coding scheme (FCS), where the plurality of frame coding parameters is selected from a group that includes frequency, time delay, and phase; wherein the BCD is configured to re-transmit the re-modulated illuminating signal as modified in accordance with the FCS to the illumination source or other intended recipient; and
,wherein the illumination source or other intended recipient is configured to receive the re-transmitted signal from the BCD, synchronously reverse the modifications made to the re-transmitted signal by the BCD according to the FCS for each received frame of the re-transmitted signal, and demodulate the re-transmitted signal to extract the message data therefrom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 16)
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11. A method, comprising:
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radiating an illuminating signal from an illumination source; re-modulating the illuminating signal received from the illumination source at a backscatter communication device (BCD) with message data; further modifying the re-modulated illuminating signal so that the re-modulated illuminating waveform varies as to a plurality of frame coding parameters within defined time frames as specified by a defined frame coding scheme (FCS), where the plurality of frame coding parameters is selected from a group that includes frequency, time delay, and phase; re-transmitting the re-modulated illuminating signal as modified in accordance with the FCS to the illumination source or other intended recipient; and
,receiving the re-transmitted signal from the BCD, synchronously reversing the modifications made to the re-transmitted signal by the BCD according to the FCS for each received frame of the re-transmitted signal, and demodulating the re-transmitted signal to extract the message data therefrom. - View Dependent Claims (12, 13, 14, 15, 17, 18, 19, 20)
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Specification