Added notation diagram from midterm presentation

latex/thesis/chapters/theoretical_background.tex

@@ -16,11 +16,47 @@
 \section{Notation}
 \label{sec:theo:Notation}
 
+%
+% TODOs
+%
+
 \begin{itemize}
     \item General remarks on notation (matrices, PDF, etc.)
-    \item Diagram from midterm presentation
+    \item \sout{Diagram from midterm presentation}
 \end{itemize}
 
+%
+% Figure showing notation for entire coding / decoding process
+%
+
+\tikzstyle{box} = [rectangle, minimum width=1.5cm, minimum height=0.7cm,
+                          rounded corners=0.1cm, text centered, draw=black, fill=KITgreen!80]
+\begin{figure}[htpb]
+    \centering
+
+    \begin{tikzpicture}[scale=1, transform shape]
+        \node (in) {$\boldsymbol{c}$};
+        \node[box, right=0.5cm of in] (bpskmap) {Mapper};
+        \node[right=1.5cm of bpskmap,
+              draw, circle, inner sep=0pt, minimum size=0.5cm] (add) {$+$};
+        \node[below=0.5cm of add] (noise) {$\boldsymbol{z}$};
+        \node[box, right=1.5cm of add] (decoder) {Decoder};
+        \node[box, right=1.5cm of decoder] (demapper) {Demapper};
+        \node[right=0.5cm of demapper] (out) {$\boldsymbol{\hat{c}}$};
+
+        \node at ($(bpskmap.east)!0.5!(add.west) + (0,0.3cm)$) {$\boldsymbol{x}$};
+        \node at ($(add.east)!0.5!(decoder.west) + (0,0.3cm)$) {$\boldsymbol{y}$};
+        \node at ($(decoder.east)!0.5!(demapper.west) + (0,0.3cm)$) {$\boldsymbol{\hat{x}}$};
+
+        \draw[->] (in) -- (bpskmap);
+        \draw[->] (bpskmap) -- (add);
+        \draw[->] (add) -- (decoder);
+        \draw[->] (noise) -- (add);
+        \draw[->] (decoder) -- (demapper);
+        \draw[->] (demapper) -- (out);
+    \end{tikzpicture}
+\end{figure}
+
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \section{Channel Coding with LDPC Codes}