The way signal strength varies in a wireless network can reveal what's going on behind closed doors.
It's every schoolboy's dream: an easy way of looking through walls to spy on neighbours, monitor siblings and keep tabs on the sweet jar. And now a dream no longer...
Researchers at the University of Utah say that the way radio signals vary in a wireless network can reveal the movement of people behind closed doors. Joey Wilson and Neal Patwari have developed a technique called variance-based radio tomographic imaging that processes the signals to reveal signs of movement. They've even tested the idea with a 34-node wireless network using the IEEE 802.15.4 wireless protocol. This is the protocol for personal area networks employed by home automation services, such as ZigBee.
There are fun and games galore to be had with this idea.
From Technology Review
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