In wireless sensing applications, it is often necessary to identify high-level events based on low-level sensor signals. Due to the limited computing and energy resources available on existing hardware platforms, achieving high precision classification of high-level events
is a challenge. In this paper, we present a new classification technique for identifying events of interest on resource-lean sensors. The approach introduces an innovative condensed kd-tree data structure to represent processed sensor data and uses a fast nearest neighbor search to determine the likelihood of class membership for incoming samples. The classifier consumes limited resources and provides high precision classification. To evaluate the approach, two case studies are considered, in the contexts of human movement and vehicle navigation, respectively. The classification accuracy is above 85% across the two case studies.
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