Indoor Event Detection with Eigenvector Spanning Signal Subspace for Home or Office Security

Shohei IKEDA  Hiroyuki TSUJI  Tomoaki OHTSUKI  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.7   pp.2406-2412
Publication Date: 2009/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.2406
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
home or office security,  intruder detection,  eigenvector spanning signal subspace,  antenna array,  

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This paper proposes an indoor event detection system for homes and offices that is based on electric wave reception such as intrusion into home or office. The proposed system places antenna array on the receiver side and detects events such as intrusion using the eigenvector spanning signal subspace obtained by the antenna array. The eigenvector is based on not received signal strengths (RSS) but direction of arrival (DOA) of incident signals on the antenna array. Therefore, in a static state, the variance of the eigenvector over time is smaller than that of RSS. The eigenvector changes only when the indoor environment of interest changes intermittently and statically, or dynamically. The installation cost is low, because the detection range is wide owing to indoor reflections and diffraction of electric wave and only a pair of transmitter and receiver are used. Experimental results reveal that the proposed method can distinguish the state when no event occurs and that when an event occurs clearly. Since the proposed method has a low false detection rate, it offers higher detection rates than the systems based on RSS.