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Your Wifi Can Track You In 3D. Here's How.
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2026 4 months ago
Every Wi-Fi router broadcasts radio waves that bounce off everything in your home, including your body. When you move, those reflections change in ways that are specific to what moved and how. Your router already tracks this through Channel State Information (CSI), the same system it uses to optimize your connection. Researchers figured out CSI also encodes the shape and movement of every person in the room, turning your existing network into a passive motion sensor with no extra hardware. And motion detection is only step one.
#WiFiSensing #ChannelStateInformation #CSI #RadioWaves #MotionDetection #Surveillance
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