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\begin{tikzpicture}[]
%---------------------------------------------------------------
%Knote
\matrix(m) [draw = none, column sep=25mm, row sep=2mm]{
\node(signal) [] {
\begin{tikzpicture}
\begin{axis}
[title = {\Large {Signal}},
xtick={0,20,40,64,80,98}]
\addplot[blue] table[col sep=comma] {tikz/signal.txt};
\end{axis}
\end{tikzpicture}}; &
\node(codiert) [] {
\begin{tikzpicture}[]
\begin{axis}[ title = {\Large {Codiert \space + \space Fehler}},
xtick={0,40,60,100}, axis y line*=left]
\addplot[green] table[col sep=comma] {tikz/codiert.txt};
\end{axis}
\begin{axis}[xtick={7,21,75}, axis y line*=right]
\addplot[red] table[col sep=comma] {tikz/fehler.txt};
\end{axis}
\end{tikzpicture}}; \\
\node(decodiert) [] {
\begin{tikzpicture}
\begin{axis}[title = {\Large {Decodiert}}]
\addplot[blue] table[col sep=comma] {tikz/decodiert.txt};
\end{axis}
\end{tikzpicture}}; &
\node(empfangen) [] {
\begin{tikzpicture}
\begin{axis}[title = {\Large {Empfangen}}]
\addplot[green] table[col sep=comma] {tikz/empfangen.txt};
\end{axis}
\end{tikzpicture}};\\
\node(syndrom) [] {
\begin{tikzpicture}
\begin{axis}[title = {\Large {Syndrom}}]
\addplot[black] table[col sep=comma] {tikz/syndrom.txt};
\end{axis}
\end{tikzpicture}}; &
\node(locator) [] {
\begin{tikzpicture}
\begin{axis}[title = {\Large {Locator}}]
\addplot[gray] table[col sep=comma] {tikz/locator.txt};
\end{axis}
\end{tikzpicture}};\\
};
%-------------------------------------------------------------
%FFT & IFFT deskription
\draw[thin,gray,dashed] (0,9) to (0,-9);
\node(IFFT) [scale=0.9] at (0,9.3) {IFFT};
\draw[stealth-](IFFT.south west)--(IFFT.south east);
\node(FFT) [scale=0.9, above of=IFFT] {FFT};
\draw[-stealth](FFT.north west)--(FFT.north east);
\draw[thick, ->,] (codiert)++(-1,0) +(0.05,0.5) -- +(-0.1,-0.1) -- +(0.1,0.1) -- +(0,-0.5);
%Arrows
\draw[thick, ->] (signal.east) to (codiert.west);
\draw[thick, ->] (codiert.south) to (empfangen.north);
\draw[thick, ->] (empfangen.west) to (decodiert.east);
\draw[thick, ->] (syndrom.east) to (locator.west);
\draw[thick](decodiert.south east)++(-1.8,1) ellipse (1.3cm and 0.8cm) ++(-1.3,0) coordinate(zoom) ;
\draw[thick, ->] (zoom) to[out=180, in=90] (syndrom.north);
%item
\node[circle, draw, fill =lightgray] at (signal.north west) {1};
\node[circle, draw, fill =lightgray] at (codiert.north west) {2+3};
\node[circle, draw, fill =lightgray] at (empfangen.north west) {4};
\node[circle, draw, fill =lightgray] at (decodiert.north west) {5};
\node[circle, draw, fill =lightgray] at (syndrom.north west) {6};
\node[circle, draw, fill =lightgray] at (locator.north west) {7};
\end{tikzpicture}
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