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Sensors 2015, 15(6), 12539-12559; doi:10.3390/s150612539

Target Localization in Wireless Sensor Networks Using Online Semi-Supervised Support Vector Regression

Department of Mechanical and Aerospace Engineering, Seoul National University, 599 Gwanangno, Gwanak-gu, Seoul KS013, Korea
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Author to whom correspondence should be addressed.
Academic Editor: Leonhard M. Reindl
Received: 13 February 2015 / Revised: 15 May 2015 / Accepted: 18 May 2015 / Published: 27 May 2015
(This article belongs to the Section Sensor Networks)
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Abstract

Machine learning has been successfully used for target localization in wireless sensor networks (WSNs) due to its accurate and robust estimation against highly nonlinear and noisy sensor measurement. For efficient and adaptive learning, this paper introduces online semi-supervised support vector regression (OSS-SVR). The first advantage of the proposed algorithm is that, based on semi-supervised learning framework, it can reduce the requirement on the amount of the labeled training data, maintaining accurate estimation. Second, with an extension to online learning, the proposed OSS-SVR automatically tracks changes of the system to be learned, such as varied noise characteristics. We compare the proposed algorithm with semi-supervised manifold learning, an online Gaussian process and online semi-supervised colocalization. The algorithms are evaluated for estimating the unknown location of a mobile robot in a WSN. The experimental results show that the proposed algorithm is more accurate under the smaller amount of labeled training data and is robust to varying noise. Moreover, the suggested algorithm performs fast computation, maintaining the best localization performance in comparison with the other methods. View Full-Text
Keywords: semi-supervised learning; online support vector regression; wireless sensor network semi-supervised learning; online support vector regression; wireless sensor network
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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MDPI and ACS Style

Yoo, J.; Kim, H.J. Target Localization in Wireless Sensor Networks Using Online Semi-Supervised Support Vector Regression. Sensors 2015, 15, 12539-12559.

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