Trading off power consumption and prediction performance in wearable motion sensors: An optimal and real-time approach

Ramin Fallahzadeh, Hassan Ghasemzadeh

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Power consumption is identified as one of the main complications in designing practical wearable systems, mainly due to their stringent resource limitations. When designing wearable technologies, several system-level design choices, which directly contribute to the energy consumption of these systems, must be considered. In this article, we propose a computationally lightweight system optimization framework that trades off power consumption and performance in connected wearable motion sensors. While existing approaches exclusively focus on one or a few hand-picked design variables, our framework holistically finds the optimal power-performance solution with respect to the specified application need. Our design tackles a multi-variant non-convex optimization problem that is theoretically hard to solve. To decrease the complexity, we propose a smoothing function that reduces this optimization to a convex problem. The reduced optimization is then solved in linear time using a devised derivative-free optimization approach, namely cyclic coordinate search. We evaluate our framework against several holistic optimization baselines using a real-world wearable activity recognition dataset. We minimize the energy consumption for various activity-recognition performance thresholds ranging from 40% to 80% and demonstrate up to 64% energy savings.

Original languageEnglish (US)
Article number67
JournalACM Transactions on Design Automation of Electronic Systems
Volume23
Issue number5
DOIs
StatePublished - Oct 2018
Externally publishedYes

Keywords

  • Activity recognition
  • Body sensor networks
  • Embedded systems
  • Energy optimization
  • Wearable monitoring systems

ASJC Scopus subject areas

  • Computer Science Applications
  • Computer Graphics and Computer-Aided Design
  • Electrical and Electronic Engineering

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