WiFi without Batteries

WiFi without Batteries

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Thanks to HitchHike, a low power tag reflects existing 802.11b transmissions from a commodity WiFi transmitter, and the backscattered signals can then be decoded as a standard WiFi packet by a commodity 802.11b receiver. WiFi is well-known to be power-hungry. Commodity WiFi radios consume several hundreds of milliwatts of power....

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