Utilizing the Virtual Triangulation for Wireless Indoor Localization of Mobile Devices with Channel State Information

Abstract

To locate an RF device or to enable target oriented communication services in wireless indoor environment, RF properties as RSSI and CSI have been widely adopted in the research and commercial societies. However, the complex indoor scenario makes the task to locate an RF device with fine-grained accuracy more difficult. This paper deals with a virtual triangulation utilization to estimate the length of Line of Sight (LoS) signal out of non LoS on receiving multipath signals from any dimension. Thus, it forms a virtual right angled triangle of the received signals. From the angles ratio, the propose method estimates the side corresponding to the reference LoS length. Eventually, it estimates the distance error between the measured reference LoS of the virtual triangle and the approximated LoS from the CSI. The error is utilized to provide a basement for more precise localization of an RF device.