Start doc on fading channels

1 files changed, 37 insertions, 0 deletions

diff --git a/doc/thesis/figures/tikz/multipath-sketch.tex b/doc/thesis/figures/tikz/multipath-sketch.tex
new file mode 100644
index 0000000..096f06f
--- /dev/null
+++ b/doc/thesis/figures/tikz/multipath-sketch.tex
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+% vim: set ts=2 sw=2 noet:
+\begin{tikzpicture}[
+			antenna/.pic = {
+				\draw[very thick] (0,0) -- ++(2mm, 3mm) -- ++(-4mm,0) -- cycle;
+				\draw[very thick] (0,0) -- ++(0,-5mm) coordinate (-mast) {};
+				\draw[thick] (0,0) -- ++(0,3mm);
+				\node[inner sep = 0pt, outer sep = 6pt] (-center) at (0,2mm) {};
+			},
+	]
+
+	% Antennas
+	\draw (0,2) pic (T) {antenna} node[above left = 3mm] {\sffamily\bfseries TX};
+	\draw (5,0) pic (R) {antenna} node[above right = 3mm] {\sffamily\bfseries RX};
+
+	% wall coefficients
+	\draw[thick] (4.75, 2.25) to[out = -20, in = 180] ++(1.2,-.5) node[right] {\(|\Gamma| > 0\)};
+
+	% walls
+	\draw[thick, fill = lightgray!20] (3,2) -- ++(2,-.5) -- ++(0,1) -- ++(-2,.5) -- cycle;
+	\draw[thick, fill = lightgray!20] (-1,0) -- ++(3,0) -- ++(1,-.5) -- ++(-3,0) -- cycle;
+
+
+	% reflected signals
+	\draw[line width = 2pt, blue!50!white, -latex] (T-center) -- node[above, pos = .5] {\(\tau_2\)} (4,2.25) -- (R-center);
+	\draw[line width = 2pt, blue!50!white, -latex] (T-center) -- node[left, pos = .7] {\(\tau_3\)} (1,-.25) -- (R-center);
+	\draw[line width = 2pt, blue!50!white, -latex] (T-center) -- node[above, pos = .5] {\(\tau_4\)} (-2.5,1.5) -- (R-center); 
+
+	% another wall
+	\draw[thick, fill = lightgray!20] (-2,0) -- ++(-1,.5) -- ++(0,2) --++(1,-.5) -- cycle;
+
+	% LOS path
+	\draw[line width = 1mm, red!50!white,
+		decorate, decoration = {
+			expanding waves, angle = 5, segment length = 2mm
+		}
+	] (T-center) -- node[above = 2mm, pos = .5] {\(\tau_1\)} (R-center);
+\end{tikzpicture}