A discreet surveillance system using wireless signal fluctuation

To avoid unattended death of “single elderly people”, this paper proposes a discreet surveillance system. The proposed surveillance system use wireless communication device to sense living activities, because employing surveillance camera will cause invasions of privacy. In this paper we report some results of preliminary experiments, which clarify relationship between wireless signal fluctuation and several living activities; sleeping, deskwork, walk-through and so on. As a result, we can show that our system can sense living activities from signal fluctuations.