MOTION DETECTION UNDER UBIQUITOUS WI-FI

This article deals with a feasibility study on the detection of human movements in indoor scenarios based on radio signal strength variations. The sensing principle exploits the fact that the human body interacts with wireless signals, introducing variations of the radiowave fields due to shadowing and multipath phenomena. As a result, human motion can be inferred from fluctuations of radiowave power collected by a receiving terminal. In this paper, Experimental tests are performed in an indoor environment by using a Wireless device as a Wi-Fi access point and a laptop with dedicated software as a receiver. Simple detection strategies for real-time operation are implemented to process the received signal strength measurements. The achieved results confirm the potentialities of the simple system here proposed to reliably detect human motion in operational conditions.