revise intro
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@@ -54,7 +54,7 @@ for truly continuous transitions along the surface spanned by all triangles.
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%eval - wifi, fingerprinting
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The outcomes of the state evaluation process depend highly on the used sensors.
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Most smartphone-based systems are using received signal strength indications (RSSI) given by \docWIFI{} or Bluetooth as a source for absolute positioning information.
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At this, one can mainly distinguish between fingerprinting and signal-strength prediction model based solutions \cite{Ebner-17}.
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At this, one can mainly distinguish between fingerprinting and signal strength prediction model based solutions \cite{Ebner-17}.
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Indoor localization using \docWIFI{} fingerprints was first addressed by \cite{radar}.
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During a one-time offline-phase, a multitude of reference measurements are conducted.
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During the online-phase the pedestrian's location is then inferred by comparing those prior measurements against live readings.
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