clever trick: convert Bluetooth signals to WiFi

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clever trick: convert Bluetooth signals to WiFi

Postby RoddyAxn » Mon Aug 01, 2016 9:38 am

Wi-Fi requires a 22 MHz bandwidth and uses spread spectrum coding whereas Bluetooth requires up to 2 MHz bandwidth and relies on Gaussian Frequency Shift Keying, in which a one is represented by a positive frequency shift of 250 kHz and a zero as a negative shift of 250 kHz. These systems are entirely different.

But Smith and co have come up with a clever trick that allows them to convert Bluetooth signals to Wi-Fi. This relies on making a Bluetooth transmitter broadcast a continuous sequence of either ones or zeros to produces a continuous tone of white noise.

It is this noise that that embedded device picks up, modifies and rebroadcasts as Wi-Fi by a process called backscattering. This produces a signal that is shifted in frequency to one of the Wi-Fi channels and then modulated in line with the 802.11b Wi-Fi transmission protocol.

https://www.technologyreview.com/s/6020 ... edium=post
RoddyAxn
 
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