Merge branch 'master' of github.com:NaoPross/Fading

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diff --git a/doc/thesis/chapters/theory.tex b/doc/thesis/chapters/theory.tex
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--- a/doc/thesis/chapters/theory.tex
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@@ -42,12 +42,16 @@ Now, let \(\vec{m} \in \{0,1\}^n\) be a binary row vector that encodes our messa
 
 \section{Problem description}
 
+%% NP: move in introduction?
+Since decades now modern wireless devices have become so ubiquitous and are no longer employed under carefully chosen conditions. Cellphones and IoT devices are carried around by users and thus have to work in environments where reflexions are omnipresent. In order to efficiently develop such devices we need for mathematical models to simulate such environments.
+
+In this chapter we will briefly illustrate some undergraduate level mathematical models employed in modern communication devices.
+
 \section{Geometric Model}
 
 \section{Statistical Model}
 
 %% TODO: write about advantage of statistical model instead of geometric
-%% TODO: review and rewrite notes
 
 \subsection{Continuous time model}