Analysis of wireless localization in nonline-of-sight conditions

Dawei Liu, Moon Chuen Lee, Chi Man Pun, Hongli Liu

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

One major concern of existing wireless localization systems is the identification of nonline-of-sight (NLOS) signal propagation, since NLOS can be considered the dominant source of localization error. Present identification methods usually assume that NLOS could make it not possible to perform localization in a consistent manner. However, the validity of the foregoing assumption has not been properly investigated. This paper presents a theoretical analysis of mobile user localization involving one or more NLOS beacons and shows the given assumption as being invalid when the estimated user location is outside the convex hull of the beacons used in the localization. It also proposes an efficient algorithm for checking whether the estimated location of a mobile user is inside the convex-hull region in both 2-D and 3-D space. Extensive localization experiments on different wireless networks demonstrate that using current NLOS identification methods and classical localization algorithms could yield localization results with grossly underestimated errors.

Original languageEnglish
Article number6469254
Pages (from-to)1484-1492
Number of pages9
JournalIEEE Transactions on Vehicular Technology
Volume62
Issue number4
DOIs
Publication statusPublished - 2013

Keywords

  • Convex hull
  • nonline-of-sight (NLOS)
  • wireless localization

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