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Sensors 2015, 15(3), 5058-5080;

Sub-Sampling Framework Comparison for Low-Power Data Gathering: A Comparative Analysis

DEI, University of Bologna, 40123 Bologna, Italy
DA, Fondazione Bruno Kessler, I-38123 Trento, Italy
DII, University of Trento, I-38123 Trento, Italy
IIS, ETH, 8092 Zurich, Switzerland
Author to whom correspondence should be addressed.
Academic Editors: Lavagno Luciano and Mihai T. Lazarescu
Received: 28 November 2014 / Revised: 5 February 2015 / Accepted: 17 February 2015 / Published: 2 March 2015
(This article belongs to the Special Issue Wireless Sensor Networks and the Internet of Things)
Full-Text   |   PDF [725 KB, uploaded 2 March 2015]


A key design challenge for successful wireless sensor network (WSN) deployment is a good balance between the collected data resolution and the overall energy consumption. In this paper, we present a WSN solution developed to efficiently satisfy the requirements for long-term monitoring of a historical building. The hardware of the sensor nodes and the network deployment are described and used to collect the data. To improve the network’s energy efficiency, we developed and compared two approaches, sharing similar sub-sampling strategies and data reconstruction assumptions: one is based on compressive sensing (CS) and the second is a custom data-driven latent variable-based statistical model (LV). Both approaches take advantage of the multivariate nature of the data collected by a heterogeneous sensor network and reduce the sampling frequency at sub-Nyquist levels. Our comparative analysis highlights the advantages and limitations: signal reconstruction performance is assessed jointly with network-level energy reduction. The performed experiments include detailed performance and energy measurements on the deployed network and explore how the different parameters can affect the overall data accuracy and the energy consumption. The results show how the CS approach achieves better reconstruction accuracy and overall efficiency, with the exception of cases with really aggressive sub-sampling policies. View Full-Text
Keywords: wireless sensor networks; low-power design; data reconstruction; compressive sensing; latent variables wireless sensor networks; low-power design; data reconstruction; compressive sensing; latent variables
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Milosevic, B.; Caione, C.; Farella, E.; Brunelli, D.; Benini, L. Sub-Sampling Framework Comparison for Low-Power Data Gathering: A Comparative Analysis. Sensors 2015, 15, 5058-5080.

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