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. 2009:2009:6901-5.
doi: 10.1109/IEMBS.2009.5333615.

Episodic sampling: towards energy-efficient patient monitoring with wearable sensors

Lawrence K Au  1 , Maxim A Batalin, Thanos Stathopoulos, Alex A T Bui, William J Kaiser
Affiliations

Episodic sampling: towards energy-efficient patient monitoring with wearable sensors

Lawrence K Au et al. Annu Int Conf IEEE Eng Med Biol Soc. 2009.

Abstract

Energy efficiency presents a critical design challenge in wireless, wearable sensor technology, mainly because of the associated diagnostic objectives required in each monitoring application. In order to maximize the operating lifetime during real-life monitoring and maintain sufficient classification accuracy, the wearable sensors require hardware support that allows dynamic power control on the sensors and wireless interfaces as well as monitoring algorithms to control these components intelligently. This paper introduces a context-aware sensing technique known as episodic sampling - a method of performing context classification only at specific time instances. Based on Additive-Increase/Multiplicative-Decrease (AIMD), episodic sampling demonstrates an energy reduction of 85 percent with a loss of only 5 percent in classification accuracy in our experiment.

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Figures

Fig. 1
Fig. 1
Wearable Device and Sensors
Fig. 2
Fig. 2
Episodic Sampling vs. Continuous Sampling
Fig. 3
Fig. 3
Raw Waveforms from Respiratory Sensor
Fig. 4
Fig. 4
Classification with Episodic Sampling
Fig. 5
Fig. 5
Experimental Results - Continuous vs. Episodic Sampling
See this image and copyright information in PMC

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