Wireless technology is exploding as the hardware becomes cheaper and uses less power. Chances are good that the upward trajectory will continue over the next few years, as companies are betting that smart devices and remote controls that use the short-range IEEE 802.15.4 protocol will find a place on the market. Now, researchers have used one of the features that provides that protocol with robustness against noise in order to track the movements of people around a room they couldn't otherwise see into.
