Real time evaluation of RF fingerprints in wireless LAN localization systems

Nuha Al Khanbashi, Nayef Al Sindi, Saleh Al-Araji, Nazar Ali, Zdenek Chaloupka, Vivek Yenamandra, James Aweya

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

22 Scopus citations

Abstract

RF location fingerprinting has received significant attention as a practical solution to the indoor localization problem due to its use of the available wireless infrastructure (WLANs) and the simplicity of measuring the Received Signal Strength (RSS) fingerprint. The improvement of RSS-based fingerprinting has been limited due to RSS being a weak fingerprint structure; where it has been reported in literature that using more complex pattern recognition algorithms provides diminishing gains. Recently channel-based RF fingerprints such as the channel impulse response (CIR), channel transfer function (CTF) and frequency coherence function (FCF) have been proposed to improve the accuracy at the physical layer. An empirical evaluation of the physical layer fingerprints does not exist in literature and there is a need to understand the advantages/limitations of these fingerprint structures/ signatures. As a result in this paper we provide a comprehensive empirical performance evaluation of location fingerprinting with a focus on analytical comparison of the RSS, CIR, CTF and FCF -based fingerprints using the weighted k-nearest neighbor (kNN) pattern recognition technique. By conducting frequency domain channel measurements in the IEEE 802.11 band at the university campus we evaluate the accuracy of the fingerprints and their robustness to human induced motion perturbations to the channel. We also provide analysis on the impact of system parameters such as the number of access points and the number of nearest neighbors.

Original languageBritish English
Title of host publication2013 10th Workshop on Positioning, Navigation and Communication, WPNC 2013 - Proceedings
DOIs
StatePublished - 2013
Event2013 10th Workshop on Positioning, Navigation and Communication, WPNC 2013 - Dresden, Germany
Duration: 20 Mar 201321 Mar 2013

Publication series

Name2013 10th Workshop on Positioning, Navigation and Communication, WPNC 2013 - Proceedings

Conference

Conference2013 10th Workshop on Positioning, Navigation and Communication, WPNC 2013
Country/TerritoryGermany
CityDresden
Period20/03/1321/03/13

Keywords

  • Channel impulse response fingerprinting
  • frequency coherence function
  • performance evaluation of localization fingerprinting
  • RSS location fingerprinting

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