Review construction of orthogonal carriers

3 files changed, 52 insertions, 45 deletions

diff --git a/doc/thesis/figures/tikz/qam-constellation.tex b/doc/thesis/figures/tikz/qam-constellation.tex
index 6481650..eeeddc3 100644
--- a/doc/thesis/figures/tikz/qam-constellation.tex
+++ b/doc/thesis/figures/tikz/qam-constellation.tex
@@ -21,6 +21,9 @@
 		}
 	}
 
+	% special node for the example
+	\node[star, fill = blue!40!white] at (s32) {};
+
 	\foreach \i/\l in {0/00,1/01,2/11,3/10}{
 		\node[lightgray, below = 3mm] at (s\i0) {\texttt{\l}};
 		\node[lightgray, left = 2mm] at (s0\i) {\texttt{\l}};
diff --git a/doc/thesis/figures/tikz/qam-example.tex b/doc/thesis/figures/tikz/qam-example.tex
new file mode 100644
index 0000000..2d37f55
--- /dev/null
+++ b/doc/thesis/figures/tikz/qam-example.tex
@@ -0,0 +1,49 @@
+% vim: set ts=2 sw=2 noet:
+
+%% TODO: finish this figure
+
+\begin{tikzpicture}
+	% 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}
+\end{tikzpicture}
diff --git a/doc/thesis/figures/tikz/qam-modulator.tex b/doc/thesis/figures/tikz/qam-modulator.tex
index a55ff29..7ebc2c5 100644
--- a/doc/thesis/figures/tikz/qam-modulator.tex
+++ b/doc/thesis/figures/tikz/qam-modulator.tex
@@ -77,51 +77,6 @@
 	\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]