title: PILA: Sub-Meter Localization Using CSI from Commodity Wi-Fi Devices.
abstract: The aim of this paper is to present a new indoor localization approach by employing the Angle-of-arrival (AOA) and Received Signal Strength (RSS) measurements in Wi-Fi network. To achieve this goal, we first collect the Channel State Information (CSI) by using the commodity Wi-Fi devices with our designed three antennas to estimate the AOA of Wi-Fi signal. Second, we propose a direct path identification algorithm to obtain the direct signal path for the sake of reducing the interference of multipath effect on the AOA estimation. Third, we construct a new objective function to solve the localization problem by integrating the AOA and RSS information. Although the localization problem is non-convex, we use the Second-order Cone Programming (SOCP) relaxation approach to transform it into a convex problem. Finally, the effectiveness of our approach is verified based on the prototype implementation by using the commodity Wi-Fi devices. The experimental results show that our approach can achieve the median error 0.7 m in the actual indoor environment.
authors.affiliation: Chongqing Key Lab of Mobile Communications Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China. tianzs@cqupt.edu.cn.
authors.forename: Zengshan
authors.initials: Z
authors.lastname: Tian
authors.affiliation: Chongqing Key Lab of Mobile Communications Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China. lizecqupt@yahoo.com.
authors.forename: Ze
authors.initials: Z
authors.lastname: Li
authors.affiliation: Chongqing Key Lab of Mobile Communications Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China. zhoumu@cqupt.edu.cn.
authors.forename: Mu
authors.initials: M
authors.lastname: Zhou
authors.affiliation: Chongqing Key Lab of Mobile Communications Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China. jinyue063@gmail.com.
authors.forename: Yue
authors.initials: Y
authors.lastname: Jin
authors.affiliation: Chongqing Key Lab of Mobile Communications Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China. wuzipeng2010@foxmail.com.
authors.forename: Zipeng
authors.initials: Z
authors.lastname: Wu
keywords: Angle-of-Arrival; Channel State Information; Received Signal Strength; Wi-Fi; indoor localization