Indoor positioning system using WLAN channel estimates as fingerprints for mobile devices

Erick Schmidt; David Akopian

doi:10.1117/12.2083670

11 March 2015 Indoor positioning system using WLAN channel estimates as fingerprints for mobile devices

Erick Schmidt, David Akopian

Proceedings Volume 9411, Mobile Devices and Multimedia: Enabling Technologies, Algorithms, and Applications 2015; 94110R (2015) https://doi.org/10.1117/12.2083670
Event: SPIE/IS&T Electronic Imaging, 2015, San Francisco, California, United States

Abstract

With the growing integration of location based services (LBS) such as GPS in mobile devices, indoor position systems (IPS) have become an important role for research. There are several IPS methods such as AOA, TOA, TDOA, which use trilateration for indoor location estimation but are generally based on line-of-sight. Other methods rely on classification such as fingerprinting which uses WLAN indoor signals. This paper re-examines the classical WLAN fingerprinting accuracy which uses received signal strength (RSS) measurements by introducing channel estimates for improvements in the classification of indoor locations. The purpose of this paper is to improve existing classification algorithms used in fingerprinting by introducing channel estimates when there are a low number of APs available. The channel impulse response, or in this case the channel estimation from the receiver, should characterize a complex indoor area which usually has multipath, thus providing a unique signature for each location which proves useful for better pattern recognition. In this experiment, channel estimates are extracted from a Software-Defined Radio (SDR) environment, thus exploiting the benefits of SDR from a NI-USRP model and LabVIEW software. Measurements are taken from a known building, and several scenarios with one and two access points (APs) are used in this experiment. Also, three granularities in distance between locations are analyzed. A Support Vector Machine (SVM) is used as the algorithm for pattern recognition of different locations based on the samples taken from RSS and channel estimation coefficients.

Citation Download Citation

Erick Schmidt and David Akopian "Indoor positioning system using WLAN channel estimates as fingerprints for mobile devices", Proc. SPIE 9411, Mobile Devices and Multimedia: Enabling Technologies, Algorithms, and Applications 2015, 94110R (11 March 2015); https://doi.org/10.1117/12.2083670

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