All these Wifi for tracking people methods use the channel state information (CSI) that is used to help decode the transmitted data. CSI is obtained from pilot signals that are transmitted as part of a regular transmission. This is done in basically all digital communication standards, so you could do this not just with Wifi but also with 4G or 5G or older mobile communication standards. This is all not very surprising, there is a lot of research in contactless radio based heart rate monitoring, they usually build on radar systems not communication systems though. The buzzword for 6G for all this is joint communication and sensing.
Comment on WiFi signals can measure heart rate—no wearables needed
GamingChairModel@lemmy.world 1 day agoArticle is paywalled for me.
Does it describe the methodology of how they use the transmitter and receiver?
What specifically are they transmitting? Is it actually wifi signals within the 802.11 protocols, or is “wifi” just shorthand for emitting radio waves in the same spectrum bands as wifi?
zaphod@sopuli.xyz 19 hours ago
cows_are_underrated@feddit.org 1 day ago
Yeah sadly it is paywalled, but I have been lucky enough to get access to it through my university.
Heres what I found regarding your question in the article:
Fig 1:
Image
And this is the Setup they used (left site) and the one that other researchers used (right side):
Image
The parts on how they collected the data:
To me it sounds like, that they really just used standard WIFI to collect the data (this is especially true for the E-Health Dataset), since all the processing gets done on the Raspberry Pi.
WhyJiffie@sh.itjust.works 1 day ago
does that mean a passive observer can do all that observations? and that a raspberry pi, with its single average antenna is capable of this?
cows_are_underrated@feddit.org 1 day ago
It may be possible, but I have no clue. It may also be, that the position of the router and the Laptop is important, but that’s probably something you would have to test.