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% vim: set ts=2 sw=2 noet spell:
\begin{tikzpicture}[
% show background rectangle,
box/.style = {
font = \small\sffamily\bfseries,
draw, thick, fill = white,
minimum height = 10mm,
minimum width = 25mm,
},
]
\matrix[
nodes = {box}, column sep = 10mm, row sep = 10mm,
]{
\node (SRC) {Source}; &
\node (ENC) {Encoder}; &
\node (MOD) {Modulator}; \\
&& \node (CHN) {Channel}; \\
\node (SNK) {Sink}; &
\node (DEC) {Decoder}; &
\node (DMD) {Demodulator}; \\
};
\draw[very thick, -latex]
(SRC) edge node[midway, above] {\(m\)} (ENC)
(ENC) edge node[midway, above] {\(m_e\)} (MOD)
(MOD) edge node[midway, right] {\(s(t)\)} (CHN)
(CHN) edge node[midway, right] {\(r(t)\)} (DMD)
(DMD) edge node[midway, above] {\(\hat{m}_e\)} (DEC)
(DEC) edge node[midway, above] {\(\hat{m}\)} (SNK)
;
\draw[very thick, -latex]
($(MOD.east)+(5mm,0)$) node[right] (CARR) {Carrier \(e^{j(\omega_c t + \phi)}\)} to (MOD);
\draw[very thick, -latex]
($(CHN.east)+(5mm,0)$) node[right] (NOISE) {Noise \(n(t)\)} to (CHN);
% \draw[very thick, -latex]
% ($(CHN.west)-(5mm,0)$) node[left] (FADE) {Fading} to (CHN);
\draw[very thick, -latex]
($(DMD.east)+(5mm,0)$) node[right] (SYNC) {Sync} to (DMD);
\begin{pgfonlayer}{background}
\fill[lightgray!20] ($(SRC.north west)+(-5mm,5mm)$) node (TX) {}
rectangle ($(MOD.south -| CARR.east)+(5mm,-5mm)$);
\fill[lightgray!20] ($(SNK.north west)+(-5mm,5mm)$) node (RX) {}
rectangle ($(DMD.south -| CARR.east)+(5mm,-5mm)$);
\node[gray, font = \ttfamily\bfseries, anchor = south west]
at (TX.north) {Transmitter};
\node[gray, font = \ttfamily\bfseries, anchor = south west]
at (RX.north) {Receiver};
\end{pgfonlayer}
\end{tikzpicture}
|
