News for hackers. Stuff that matters.

A comment on DopplerFi – Communication Between BLE and Wi-Fi by Injecting Doppler Shifts.

Re:DopplerFi – Communication Between BLE and Wi-Fi by Inject... by ajross on Tuesday April 09, 2019 @09:51AM (#19614579)
OK, that's clever.

But... why are they calling these "Doppler" shifts? A Doppler shift is a frequency change due to motion of the transmitter relative to the wave medium. Clearly they're not throwing these radios around. So these are just "frequency" shifts, right?

[ Parent | on HN ]
Re:DopplerFi – Communication Between BLE and Wi-Fi by Inject... by Jeija on Tuesday April 09, 2019 @10:38AM (#19615101)
Citing from the paper: We refer the frequency shift satisfying the above requirements as artificial Doppler shift, implying that it has minimal impact on existing systems just like Doppler shifts caused by normal movements.

So they're just calling these "Doppler" shifts because they are so small that they don't really have any effect on the WiFi link, just like real Doppler shifts should be compensated for, while the tiny frequency shifts still contain enough information to be picked up by the BLE radio.

[ Parent | on HN ]