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RF-based Device-Free Localization and Tracking for Ambient Assisted Living

Radio frequency (RF) sensor networks are wireless sensor networks (WSNs) which use only the received signal strength (RSS) to perform tasks such as device-free localization (DFL) and tracking of individuals. In these systems, people to be located do not participate in the localization effort by carrying any radio device or sensor. Instead, a static deployed wireless network measures RSS on its links and locates people based on the variations caused by the movements of people in the monitored area. In this paper, we present features and functioning of an RF sensor network deployed in a home for indoor localization and tracking for ambient assisted living (AAL). Our system is composed of low-power IEEE 802.15.4 transceivers, operating in the 2.4 GHz ISM band, that collect and process RSS data in real-time and estimate the locations of people over time.