Backscatter Communication Among Commodity WiFi Radios
First Claim
1. A backscatter tag communicate device comprising:
- a receiver configured to receive a WiFi packet conforming to a communication protocol defining a plurality of codewords;
a mapper configured to map at least a first subset of the plurality of codewords disposed in the packet to a second plurality of codewords defined by the protocol; and
a frequency shifter configured to shift a frequency of the second plurality of codewords such that the frequency shifted codewords are characterized by a single sideband spectrum.
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Abstract
A backscatter tag communicate device includes, in part, a receiver configured to receive a WiFi packet conforming to a communication protocol defining a multitude of codewords, a mapper configured to map at least a first subset of the multitude of codewords disposed in the packet to a second multitude of codewords defined by the protocol, and a frequency shifter configured to shift a frequency of the second multitude of codewords such that the frequency shifted codewords are characterized by a single sideband spectrum. The communication protocol may be the 802.11b communication protocol. The mapper may optionally map the first subset of the multitude of codewords by changing phases of the first subset of the multitude of codewords.
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20 Claims
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1. A backscatter tag communicate device comprising:
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a receiver configured to receive a WiFi packet conforming to a communication protocol defining a plurality of codewords; a mapper configured to map at least a first subset of the plurality of codewords disposed in the packet to a second plurality of codewords defined by the protocol; and a frequency shifter configured to shift a frequency of the second plurality of codewords such that the frequency shifted codewords are characterized by a single sideband spectrum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 16, 17, 18, 19, 20)
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11. A method of communication via a backscatter tag, the method comprising:
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receiving a packet conforming to a WiFi communication protocol defining a plurality of codewords; mapping at least a first subset of the plurality of codewords disposed in the packet to a second plurality of codewords defined by the protocol; and shifting a frequency of the second plurality of codewords such that the frequency shifted codewords are characterized by a single sideband spectrum. - View Dependent Claims (12, 13, 14)
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Specification