Evaluation of fingerprinting-based WiFi indoor localization coexisted with Bluetooth

Ling Pei,Yuwei Chen,Liang Chen,Jingbin Liu,Ruizhi Chen

doi:10.1186/s41445-017-0008-x

Abstract

WiFi and Bluetooth are two most commonly used short range wireless communication technologies. Recent years, with increasing number of WiFi and Bluetooth mobile terminals, tags, and other devices, a demand for integration and coexistence of these two technologies including their positioning function is booming. In this paper, we firstly investigate the interferences between WiFi and Bluetooth signals from the signal and protocol perspectives. Secondly, the principle of fingerprinting approach for WiFi positioning is introduced. In order to evaluate the performance of WiFi fingerprinting coexisted with Bluetooth, both occurrence-based and Weibull-based approaches are utilized for generating the database. Field tests present the interference in the WiFi and Bluetooth coexistence environments. A WiFi mobile device with a Bluetooth device nearby obtains poor positioning results due to the interference. Weibull-based database has more robust performance than occurrence-based database in the coexistence environments.

Highlights

In the fast growing mobile device market, the location capability has become one of the most demanded features
This paper gives the preliminary results of WiFi positioning in a WiFi and Bluetooth coexistence environment
The results indicate that stronger RSSI values usually result in more stable RSSI observations

Summary

Introduction

In the fast growing mobile device market, the location capability has become one of the most demanded features. To address the location capability, an increasing number of research focus on positioning and navigation technologies for both outdoor and indoor environments. The Global Navigation Satellites Systems (GNSS) greatly enrich the end users’ outdoor activities by mobile devices. The degraded areas e.g. indoors and urban canyon are still challenges for satellite based positioning technologies because of well known problems such as the weak signal or non line-of-sight (NLOS) conditions between mobile users and satellites. In order to solve the problem of positioning and navigation in GNSS-degraded or denied areas, diverse technologies are broadly researched (Kraemer and Eisfeller, 2009).

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Results

Conclusion