Occupancy Integrity Auditor (Vacation Rentals)

Every moving person stirs the WiFi signals in a room a little more. The system measures how much the signal is stirred, and that tracks the number of people very closely. It counts bodies without ever seeing faces — a number, never a picture.

In the physics: Each additional moving body adds independent scattering paths and Doppler energy; aggregate CSI variance and multipath richness scale monotonically with occupant count. LF2 occupancy count already achieves r=0.9. Count is a statistic, not an image — privacy-preserving by physics.