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Open AccessArticle

Entropy-Based TOA Estimation and SVM-Based Ranging Error Mitigation in UWB Ranging Systems

School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin 150001, China
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Academic Editors: Kourosh Khoshelham and Sisi Zlatanova
Sensors 2015, 15(5), 11701-11724; https://doi.org/10.3390/s150511701
Received: 26 March 2015 / Revised: 10 May 2015 / Accepted: 14 May 2015 / Published: 21 May 2015
(This article belongs to the Special Issue Sensors for Indoor Mapping and Navigation)
The major challenges for Ultra-wide Band (UWB) indoor ranging systems are the dense multipath and non-line-of-sight (NLOS) problems of the indoor environment. To precisely estimate the time of arrival (TOA) of the first path (FP) in such a poor environment, a novel approach of entropy-based TOA estimation and support vector machine (SVM) regression-based ranging error mitigation is proposed in this paper. The proposed method can estimate the TOA precisely by measuring the randomness of the received signals and mitigate the ranging error without the recognition of the channel conditions. The entropy is used to measure the randomness of the received signals and the FP can be determined by the decision of the sample which is followed by a great entropy decrease. The SVM regression is employed to perform the ranging-error mitigation by the modeling of the regressor between the characteristics of received signals and the ranging error. The presented numerical simulation results show that the proposed approach achieves significant performance improvements in the CM1 to CM4 channels of the IEEE 802.15.4a standard, as compared to conventional approaches. View Full-Text
Keywords: ranging; entropy; TOA; UWB; error mitigation; SVM ranging; entropy; TOA; UWB; error mitigation; SVM
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Yin, Z.; Cui, K.; Wu, Z.; Yin, L. Entropy-Based TOA Estimation and SVM-Based Ranging Error Mitigation in UWB Ranging Systems. Sensors 2015, 15, 11701-11724.

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