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Auflistung nach Autor:in "Algeier, Vadim"

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  • Konferenzbeitrag
    Mobile terminal tracking in urban scenarios using multipath propagation
    (INFORMATIK 2006 – Informatik für Menschen, Band 1, 2006) Algeier, Vadim; Demissie, Bruno; Koch, Wolfgang; Thomä, Reiner
    Locating mobile terminals is an important requirement not only for offering location based services but also for handling emergency cases of nonsubscribed users, and radio surveillance. We propose a blind localization approach which takes advantage of multipath propagation by using additional information about the known locations of the main scattering objects, e.g. buildings. This information is processed by means of a simple ray tracing technique based on a 2D geographic data base. We assume a single observation station equipped with multiple antennas which is able of estimating the directional and relative temporal structure of the received multipath components. Exploiting the parameters of the multipath components we propose a mobile terminal tracking algorithm based on particle filtering technique.
  • Konferenzbeitrag
    Robust likelihood function for blind mobile terminal localization
    (INFORMATIK 2010. Service Science – Neue Perspektiven für die Informatik. Band 2, 2010) Algeier, Vadim; Thomä, Reiner; Koch, Wolfgang
    The focus of this contribution is put on the blind localization of mobile terminals in urban scenarios. The proposed localization method exploits multipath propagation, which is typical of urban terrain. It is assumed that each multipath component is characterized by its direction of arrival (DoA) and relative time of arrival (RToA) parameter. In essence the developed method compares the multipath parameters predicted by the ray tracing algorithm with those measured by the single observing station. In this context inevitably occur a multipath order problem, which is tackled in detail within a proposed likelihood function definition. The latter follows an approach known from the robust statistics. Its intention is to provide a robust and reliable position estimate having at hand minimum a priori information about system parameters.