DopplerFi – Communication Between BLE and Wi-Fi by Injecting Doppler Shifts

Re:DopplerFi – Communication Between BLE and Wi-Fi by Inject... by toomuchtodo on Tuesday April 09, 2019 @10:10AM (#19614788)

Isn’t this how tech companies (Google, Apple) are determining your location indoors without GPS (database of computed locations of previously seen WiFi access points)?

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Re:DopplerFi – Communication Between BLE and Wi-Fi by Inject... by _Microft on Tuesday April 09, 2019 @10:23AM (#19614951)

They use WiFi but not like that. As far as I know even signal strength is dropped as it fluctuates too much. They often use only presence or absence of networks to tell between which 'known' locations the user is moving.

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Re:DopplerFi – Communication Between BLE and Wi-Fi by Inject... by EGreg on Tuesday April 09, 2019 @10:49AM (#19615221)

Or beacons

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Re:DopplerFi – Communication Between BLE and Wi-Fi by Inject... by nabla9 on Tuesday April 09, 2019 @11:53AM (#19615922)

There are multiple technologies for WPS: signal strength, fingerprinting, propagation models, angle of arrival if there are multiple antennas and time of flight.

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