ToneTrack: Leveraging frequency-agile radios for time-based indoor wireless localization

Jie Xiong, Karthikeyan Sundaresan, Kyle Jamieson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

144 Scopus citations

Abstract

Indoor localization of mobile devices and tags has received much attention recently, with encouraging fine-grained localization results available with enough line-of-sight coverage and hardware infrastructure. Some of the most promising techniques analyze the time-of-arrival of incoming signals, but the limited bandwidth available to most wireless transmissions fundamentally constrains their resolution. Frequency-agile wireless networks utilize band widths of varying sizes and locations in a wireless band to efficiently share the wireless medium between users. ToneTrack is an indoor location system that achieves sub-meter accuracy with minimal hardware and antennas, by leveraging frequency-agile wireless networks to increase the effective bandwidth. Our novel signal combination algorithm combines time-of-arrival data from different transmissions as a mobile device hops across different channels, approaching time resolutions previously not possible with a single narrowband channel. ToneTrack's novel channel combination and spectrum identification algorithms together with the triangle inequality scheme yield superior results even in non-line-of sight scenarios with one to two walls separating client and APs and also in the case where the direct path from mobile client to an AP is completely blocked. We implement ToneTrack on the WARP hardware radio platform and use six of them served as APs to localize Wi-Fi clients in an indoor testbed over one floor of an office building. Experimental results show that ToneTrack can achieve a median 90 cm accuracy when 20 MHz bandwidth APs overhear three packets from adjacent channels.

Original languageEnglish (US)
Title of host publicationMobiCom 2015 - Proceedings of the 21st Annual International Conference on Mobile Computing and Networking
PublisherAssociation for Computing Machinery
Pages537-549
Number of pages13
ISBN (Electronic)9781450336192
DOIs
StatePublished - Sep 7 2015
Externally publishedYes
Event21st Annual International Conference on Mobile Computing and Networking, MobiCom 2015 - Paris, France
Duration: Sep 7 2015Sep 11 2015

Publication series

NameProceedings of the Annual International Conference on Mobile Computing and Networking, MOBICOM
Volume2015-September

Other

Other21st Annual International Conference on Mobile Computing and Networking, MobiCom 2015
CountryFrance
CityParis
Period9/7/159/11/15

All Science Journal Classification (ASJC) codes

  • Software
  • Hardware and Architecture
  • Computer Networks and Communications

Keywords

  • Bandwidth increment
  • CSI combination
  • Channel combination
  • Distributed MIMO
  • Indoor wireless location
  • MUSIC spectrum identification
  • Time (Difference) of arrival (ToA/TD-oA)
  • Time synchronization
  • Triangle inequality

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