Losen: An Accurate Indoor Localization System by Integrating CSI of Wireless Signal and MEMS Sensors

Abstract

With the development of Internet of Thing (IoT), high accuracy positioning is of a significant importance in indoor environments. In this paper we propose Losen, a real-time indoor localization system by integrating MEMS sensors of smartphone and PHY-layer information of WiFi signal. Losen consists of AOA-based localization module, MEMS sensors module and fusion localization module, which solves problem of the initial localization of the existing integrating system. Aim to reduce the time cost of calculating spatial spectrum, Losen employs synthetic aperture radar (SAR), which is used in radar filed, to estimate the AOA of the direct path between the smartphone and AP (access points). Then, Losen uses MEMS sensors to estimate relative location and fuses the location estimated by SAR for mitigating location errors caused by the movement of the person and serious multipath. Losen is a real-time indoor localization system, which fuses PHY-layer information and MEMS sensors. The extensive experiment shows that the proposed integration system achieve the 67% localization accuracy of 1.3 m.