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

This paper proposes an indoor event detection scheme using an electric wave such as intrusion into home or office. The proposed system exploits an antenna array on the receiver side and detects events such as intrusion using signal subspace spanned by eigenvector obtained by the antenna array. The eigenvector is not based on Received Signal Strengths (RSS) but on the Direction Of Arrival (DOA) of incident signals on an 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 statically or dynamically.