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 \section{Introduction}
 
+Setting up a localization solution for a building is a challenging and time-consuming task, especially in environments that are not build with localization in mind or do not provide any wireless infrastructure or both. 
+Such scenarios are of special interest when old or even historical buildings serve a new purpose such as museums, shopping malls or retirement homes.
+In terms of European architecture, the problems emanating from these buildings worsen with age.
+They are often full of nooks and crannies, have massive stonewalls, annexes from different historical periods with different construction materials and outdated or inaccurate building plans.
+All this requires additional effort when setting up the system, what is then contrary to most costumers expectations of a fast to deploy and low-cost solution.
+In addition, this is not only a question of costs incurred, but also for buildings under monumental protection, what does not allow for larger construction measures. 
+Thus a highly flexible, robust and scalable system is needed to deal with such conditions, especially with the claim of a universal solution in multiple different environments.
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+To tackle the challenges above, a novel indoor localization approach is presented within this paper and then deployed to a 13th century building. 
+The building was constructed 
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+It was first used as a convent, es erfüllt also all die oben genannten bedingungen. 
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+We believe that by utilizing our localization approach to such a worst case scenario, it is possible to prove its flexibility, robustness and manageable effort. 
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+Finally, the here presented work is an updated and highly refactored version of the winner of the smartphone-based competition at IPIN 2016 \cite{}. 
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+unser system bietet aber für alle anwendungen einen überschaubaren aufwand und soll generell unter unterschiedlichen bedingungen funktionieren. weshalb wir auch so ein worst case scenary wie ein museum ausgesucht haben. d.h. wir haben einen überschaubaren aufwand für alle gebäude. sind zwar nicht zero, aber auch nicht fingerprinting.
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+besonders kleine karten (wenig speicherplatz)
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 \cite{Ebner-17}
 
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