Radial Reference Map-Based Location Fingerprinting Technique

• Published in: Journal of Information and Communication Convergence Engineering, 14(4) Vol. 14; no. 4; pp. 207 - 214
• Main Authors: Cho, Kyoung-Woo, Chang, Eun-Young, Oh, Chang-Heon
• Format: Journal Article
• Language: English
• Published: 한국정보통신학회JICCE 2016; 한국정보통신학회
• Subjects: 전자/정보통신공학; Location estimation; RSSI; Fingerprinting; Radial reference map; Indoor location
• ISSN: 2234-8255; 2234-8883
• DOI: 10.6109/jicce.2016.14.4.207

In this paper, we propose a radial reference map-based location fingerprinting technique with constant spacing from an access point (AP) to all reference points by considering the minimum dynamic range of the received signal strength indicator (RSSI) obtained through an experiment conducted in an indoor environment. Because the minimum dynamic range, 12 dBm, of the RSSI appeared every 20 cm during the training stage, a cell spacing of 80 cm was applied. Furthermore, by considering the minimum dynamic range of an RSSI in the location estimation stage, when an RSSI exceeding the cumulative average by ${\pm}6dBm$ was received, a previously estimated location was provided. We also compared the location estimation accuracy of the proposed method with that of a conventional fingerprinting technique that uses a grid reference map, and found that the average location estimation accuracy of the conventional method was 21.8%, whereas that of the proposed technique was 90.9%.