Power-Absorption-Based Model for Power Compensation in WLAN Positioning Using Smartphone

Masaaki YAMAMOTO  Tomoaki OHTSUKI  

IEICE TRANSACTIONS on Communications   Vol.E98-B   No.6   pp.1125-1132
Publication Date: 2015/06/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E98.B.1125
Type of Manuscript: PAPER
Category: Sensing
indoor,  positioning,  WLAN,  smartphone,  

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To achieve accurate wireless-local-area-network (WLAN) positioning, the directivity and influence of multipath fading on the power absorption by the user are clarified experimentally. Based on the results, a general model of the power absorption by the user is devised. The parameters of the model are estimated using maximum-likelihood estimation (MLE) and the magnetic sensor built into modern smartphones. The proposed method compensates the power absorption and the influence of multipath fading. According to experimental evaluations, the root-mean-square error (RMSE) of the proposed method is 34% lower than that of the conventional one. Namely, RMSE of the proposed method is 1.94m in a room.