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% vim: set ts=2 sw=2 noet spell:
\begin{tikzpicture}[
% show background rectangle,
box/.style = {
font = \small\sffamily,
draw, thick, fill = white,
minimum height = 14mm,
minimum width = 28,
text width = 28mm, align = center,
},
circ/.style = {
draw, thick, circle, fill = white,
minimum size = 10mm, inner sep = 0pt,
font = \Huge,
},
]
% --------------------------------------------------------
\coordinate (TX) at (0, 0);
\matrix[
nodes = {box}, column sep = 14mm, row sep = 10mm,
inner sep = 3mm, fill = lightgray!20,
anchor = north west,
] at (TX) {
\node (SRC) {\textbf{Source}\\ Digital data}; &
\node (FRA) {\textbf{Framer}\\ Data Packets}; &
\node (MOD) {\textbf{Modulator}\\ QPSK or 16-QAM}; \\
};
\draw[very thick, -latex]
(SRC) edge node[midway, above] {\(m\)} (FRA)
(FRA) edge (MOD)
;
\node[
gray,
anchor = south west,
font = \ttfamily,
] at (TX) {Transmitter};
% --------------------------------------------------------
\coordinate (CHN) at ($(MOD.south east)+(3mm, -11mm)$);
\matrix[
row sep = 5mm, inner sep = 3mm, fill = lightgray!20,
anchor = north east,
] at (CHN) {
\node[circ] (PLUS) {\(+\)}; %
\node[left = 14mm of PLUS] (AWGN) {AWGN}; &
\node[minimum width = 12mm] {}; \\
\node[circ] (TIMES) {\(\times\)}; %
\node[left = 14mm of TIMES] (FADING) {Fading}; \\
};
\draw[very thick, -latex]
(AWGN) edge node[midway, above] {\(n(t)\)} (PLUS)
(FADING) edge node[midway, above] {\(f(t)\)} (TIMES)
(MOD) edge node[midway, right] {\(s(t)\)} (PLUS)
(PLUS) edge (TIMES)
;
\node[
gray,
anchor = south west,
font = \ttfamily,
] at ($(CHN) - (62mm, 0)$) {Channel Model};
% --------------------------------------------------------
\coordinate (RX) at (0, -68mm);
\matrix[
nodes = {box},
column sep = 14mm, row sep = 5mm,
inner sep = 3mm, fill = lightgray!20,
anchor = north west,
] at (RX) {
\node (PFC) {\textbf{Fine phase and freq. correction}}; &
\node (EQL) {\textbf{Equalizer} \\ Amplitude}; &
\node (CLK) {\textbf{Clock Recovery} \\ Symbol peak}; \\
\node (DMO) {\textbf{Demodulator}}; &
\node (DFR) {\textbf{Deframer} \\ Error detection}; &
\node (SIN) {\textbf{Sink} \\ User interface}; \\
};
\draw[very thick, -latex]
(TIMES) edge node[midway, right] {\(r(t)\)} (CLK)
(CLK) edge (EQL)
(EQL) edge (PFC)
(PFC) edge (DMO)
(DMO) edge (DFR)
(DFR) edge (SIN)
;
\node[
gray,
anchor = south west,
font = \ttfamily,
] at (RX) {Receiver};
\end{tikzpicture}
|
