Security News > 2018 > September > Counting People Through a Wall with WiFi

Interesting research: In the team's experiments, one WiFi transmitter and one WiFi receiver are behind walls, outside a room in which a number of people are present. The room can get very crowded with as many as 20 people zigzagging each other. The transmitter sends a wireless signal whose received signal strength (RSSI) is measured by the receiver. Using only...

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https://www.schneier.com/blog/archives/2018/09/counting_people.html