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% vim: set ts=2 sw=2 noet:
\begin{circuitikz}[
]
\matrix [
row sep = 5mm, column sep = 7mm,
nodes = {
align = center,
fill = white,
},
] {
& \coordinate (vmi);
& \node[twoportshape] (B2Li) {};
&
& \coordinate (mi);
&
& \node[mixer] (Mi) {};
& \coordinate (si);
\\
\node[] (M) {\(m(n)\)};
& \node[twoportshape] (BSp) {};
&
&
& \node[twoportshape] (H) {};
& \node[oscillator] (OSC) {};
& \coordinate (phii);
& \node[adder] (SUM) {};
& \node (S) {\(s(t)\)};
\\
&&&& \coordinate (phiq);
\\[-3mm]
& \coordinate (vmq);
& \node[twoportshape] (B2Lq) {};
& \coordinate (mq);
& \node[mixer] (Mq) {};
&
&
& \coordinate (sq);
\\
};
% Add missing lables
\node at (H.center) {\large \(\mathcal{H}\)};
\node at (B2Li.center) {\textsf{B2L}};
\node at (B2Lq.center) {\textsf{B2L}};
\node at (BSp) {\textsf{BSp}};
% Add connections
\begin{scope}[thick, -latex]
\draw (M) -- (BSp.west);
\draw (BSp.north) |- (B2Li.west);
\draw (B2Li.east) -- (Mi.west);
\draw (Mi.east) -| (SUM.north);
\draw (BSp.south) |- (B2Lq.west);
\draw (B2Lq.east) -- (Mq.west);
\draw (Mq.east) -| (SUM.south);
\draw (SUM.east) -- (S);
\draw (OSC.east) -| (Mi.south);
\draw (OSC.west) -- (H.east);
\draw (H.south) -- (Mq.north);
\end{scope}
% Add signal labels
\node[above right] at (vmi) {\(\vec{m}_i\)};
\node[below right] at (vmq) {\(\vec{m}_q\)};
\node[above] at (mi) {\(m_i(t)\)};
\node[below] at (mq) {\(m_q(t)\)};
\node[above right] at (phii) {\(\phi_i\)};
\node[right, yshift = 1mm] at (phiq) {\(\phi_q\)};
\node[above left] at (si) {\(s_i(t)\)};
\node[below left] at (sq) {\(s_q(t)\)};
% Draw digital signals
\begin{scope}[font = \ttfamily\footnotesize, text = blue!70!white]
\node[above = 1mm of M, xshift = 2mm] {\(\ldots 1100101\)};
\node[above = 7mm of vmi, xshift = 3mm]
{\(\overbracket[.8pt]{\,11\ldots 00\,}^{\sqrt{M} \text{ bits}}\)};
\end{scope}
% Draw analog waveform
\begin{scope}[font = \ttfamily\tiny]
\coordinate (O) at ($(mi)+(-2mm,10.5mm)$);
\node[left, red!70!white, anchor = east, text width = 8mm, align = right]
at ($(O) + (-2mm,0)$) {\(2^{\sqrt{M}}\) levels};
\foreach \y in {-3mm,0,3mm} {
\draw[gray, densely dotted] (O) ++(-2mm,\y) -- ++(22mm,0);
}
\draw[thick, draw = red!70!white] (O)
-- ++(3mm,0) -- ++(0,-3mm) -- ++(3mm,0) -- ++(0,6mm)
-- ++(3mm,0) -- ++(0,-3mm) -- ++(3mm,0) -- ++(0,-3mm)
-- ++(3mm,0) -- ++(0,3mm) -- ++(3mm,0);
\end{scope}
% Draw constellation diagram
\begin{scope}
\coordinate (O) at ($(S)+(-7mm,8mm)$);
\draw[gray, -latex] (O) ++(-2mm,0) -- ++(12mm,0) node[right] {\tiny \(\phi_i\)};
\draw[gray, -latex] (O) ++(0,-2mm) -- ++(0,12mm) node[above] {\tiny \(\phi_q\)};
\node[
circle, thick,
minimum size = 3pt,
inner sep = 0, outer sep = .8pt,
draw = gray, fill = red!50!white
] (P) at ($(O)+(5mm, 4mm)$) {};
\node[gray, above right] at (P) {\tiny \(s\)};
\draw[gray, densely dotted]
(P) -- (P |- O)
(P) -- (P -| O);
\end{scope}
% Background elements
\begin{pgfonlayer}{background}
\fill[left color = white, right color = blue!20, draw = white]
($(B2Li.north) + (0,1.1)$) coordinate (D) rectangle ($(B2Lq.south) - (3,1)$);
\fill[right color = white, left color = red!20, draw = white]
($(B2Li.north) + (0,1.1)$) coordinate (A) rectangle ($(B2Lq.south) + (9,-1)$);
\node[blue!50, anchor = south east, font = \ttfamily\bfseries, xshift = -4mm]
at (D) {\bfseries\ttfamily Digital bits};
\node[red!50, anchor = south west, font = \bfseries\ttfamily, xshift = 4mm]
at (A) {Analog waveform};
\end{pgfonlayer}
\end{circuitikz}
|
