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Sensors 2018, 18(10), 3437;

A High Accuracy Time-Reversal Based WiFi Indoor Localization Approach with a Single Antenna

Guangdong Provincial Key Laboratory of Short-Range Wireless Detection and Communication, School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510640, China
Author to whom correspondence should be addressed.
Some preliminary results of this work were presented in the Proceedings of the International Association of Chinese Professionals in Global Positioning Systems 2017 Forum on Cooperative Positioning and Service.
Received: 6 September 2018 / Revised: 29 September 2018 / Accepted: 9 October 2018 / Published: 12 October 2018
(This article belongs to the Section Sensor Networks)
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In this paper, we study the influence of multipath magnitude, bandwidth, and communication link number on the performance of the existing time-reversal (TR) based fingerprinting localization approach and find that the localization accuracy deteriorates with a limited bandwidth. To improve the localization performance, by exploiting two unique location-specified signatures extracted from Channel State Information (CSI), we propose a high accuracy TR fingerprint localization approach, HATRFLA. Furthermore, we employ a density-based spatial clustering algorithm to minimize the storage space of the fingerprint database by adaptively selecting the optimal number of fingerprints for each location. Experimental results confirm that the proposed approach can efficiently mitigate accuracy deterioration caused by a limited bandwidth and consequently, achieve higher accuracy compared with the existing TR localization approach. View Full-Text
Keywords: time reversal; Channel State Information; indoor localization; clustering time reversal; Channel State Information; indoor localization; clustering

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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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Zheng, L.; Hu, B.; Chen, H. A High Accuracy Time-Reversal Based WiFi Indoor Localization Approach with a Single Antenna. Sensors 2018, 18, 3437.

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