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

Re:DopplerFi – Communication Between BLE and Wi-Fi by Inject... by _Microft on Tuesday April 09, 2019 @08:25AM (#19613873)

Another ingenious method (ab)used WiFi to determine the distance (decimeter level, i.e. sub-nanosecond absolute time-of-flight measurements!) from a single accesspoint with common hardware.

This should be the paper, I think: https://www.usenix.org/system/files/conference/nsdi16/nsdi16...

[ Parent | on HN ]

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)?

[ Parent | on HN ]

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.

[ Parent | on HN ]

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

Or beacons

[ Parent | on HN ]

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.

[ Parent | on HN ]