Adding references

16 files changed, 147 insertions, 24 deletions

diff --git a/.gitignore b/.gitignore
index 567609b..c9c997a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 build/
+DCS.bib.bak
diff --git a/DCS.bib b/DCS.bib
new file mode 100644
index 0000000..9cb3a4d
--- /dev/null
+++ b/DCS.bib
@@ -0,0 +1,37 @@
+% This file was created with JabRef 2.7.1.
+% Encoding: UTF8
+
+@MISC{Berberich2013,
+  author = {Hubert Berberich},
+  title = {Cipher disc for substitution cipher, manufacturer: Linge, Pleidelsheim
+	(Germany)},
+  howpublished = {Wikimedia},
+  year = {2013},
+  note = {License: Public Domain, Accessed: 2020-05-02},
+  owner = {ple},
+  timestamp = {2020.05.02},
+  url = {https://en.wikipedia.org/wiki/File:CipherDisk2000.jpg}
+}
+
+@INPROCEEDINGS{friis1946,
+  author = {Harald Trap Friis},
+  title = {A Note on a Simple Transmission Formula},
+  booktitle = {IRE Proc.},
+  year = {1946},
+  pages = {254 -- 256},
+  month = {May},
+  owner = {ple},
+  timestamp = {2019.04.17}
+}
+
+@MISC{WikiSemaphore,
+  author = {Unknown},
+  title = {Chappe's semaphore},
+  howpublished = {Wikimedia},
+  year = {19th century},
+  note = {License: Public Domain, Accessed: 2020-05-02},
+  owner = {ple},
+  timestamp = {2020.05.02},
+  url = {https://en.wikipedia.org/wiki/File:Chappe_semaphore.jpg}
+}
+
diff --git a/Makefile b/Makefile
index 34e06e8..581abbc 100644
--- a/Makefile
+++ b/Makefile
@@ -4,11 +4,15 @@ BUILD_DIR = build
 LATEXMK = latexmk -pdf -silent -synctex=1
 LATEXMK_PVC = $(LATEXMK) -pvc
 
-ALL_TARGETS = $(BUILD_DIR)/chapter00.pdf $(BUILD_DIR)/chapter01.pdf $(BUILD_DIR)/chapter02.pdf
-COMMON_DEPS = common/settings.tex common/titlepage.tex common/acronym.tex common/imprint.tex
+ALL_CHAPTERS = $(BUILD_DIR)/chapter00.pdf $(BUILD_DIR)/chapter01.pdf $(BUILD_DIR)/chapter02.pdf
+COMMON_DEPS = common/settings.tex common/titlepage.tex common/acronym.tex common/imprint.tex DCS.bib
 
-all: $(ALL_TARGETS)
+all: chapters complete
 
+.PHONY: chapters
+chapters: $(ALL_CHAPTERS)
+
+.PHONY: complete
 complete: $(BUILD_DIR)/DCS.pdf
 
 clean:
diff --git a/chapter00/CaesarCipher.jpg b/chapter00/CaesarCipher.jpg
new file mode 100644
index 0000000..ad1dc9a
--- /dev/null
+++ b/chapter00/CaesarCipher.jpg
diff --git a/chapter00/OpticalTelegraph.jpg b/chapter00/OpticalTelegraph.jpg
new file mode 100644
index 0000000..c3faf86
--- /dev/null
+++ b/chapter00/OpticalTelegraph.jpg
diff --git a/chapter00/content.tex b/chapter00/content_ch00.tex
index 3ac57ff..36f2a64 100644
--- a/chapter00/content.tex
+++ b/chapter00/content_ch00.tex
@@ -74,7 +74,7 @@ Dates:
 	\begin{itemize}
 		\item Exception: 2020-05-21 is a public holiday, no lecture! We will meet on 2020-05-19 at 15:15 -- 16:45 instead.
 	\end{itemize}
-	\item Additional date if necessary: Tuesdays at 15:15 -- 16:45. Will be explicitly announces on E-Learning.
+	\item Additional date if necessary: Tuesdays at 15:15 -- 16:45. Will be explicitly announced on E-Learning.
 	\item We will use a videoconferencing tool for our meetings. I will announce details in the E-Learning.
 \end{itemize}
 
diff --git a/chapter00/exercise00.tex b/chapter00/exercise00.tex
new file mode 100644
index 0000000..ce5a690
--- /dev/null
+++ b/chapter00/exercise00.tex
@@ -0,0 +1,10 @@
+\phantomsection
+\addcontentsline{toc}{section}{Exercise 0 - Warm Up}
+\section*{Exercise 0 -- Warm Up}
+
+Make up your mind of communication technologies and how they can be used.
+
+\begin{enumerate}
+	\item Name 5 communication devices of your every-day life.
+	\item 
+\end{enumerate}
\ No newline at end of file
diff --git a/chapter00/preface.tex b/chapter00/preface.tex
index 83e8ae1..4bea33e 100644
--- a/chapter00/preface.tex
+++ b/chapter00/preface.tex
@@ -2,6 +2,8 @@
 \addcontentsline{toc}{chapter}{Preface: Digital Communication -- A Future Technology}
 \chapter*{Preface: Digital Communication -- A Future Technology}
 
+\begin{refsection}
+
 The current time during the Corona lockdown shows the great significance of telecommunication. It is self-evident to have access to online media and communication platforms. The internet helps to keep in touch with our loved ones. A huge amount of entertainment relies on internet access. The internet is highly integrated in our every-day life. Furthermore, it is a growing economy. There are not only the online services like social media or online warehouses which are going to expand their business in the future. The communication technologies, which the internet is built upon, are a growing and innovative market, too. Besides consumers, the \ac{B2B} market is a huge driver of innovation. It must be expected, that more devices get interconnected. This is a challenge because physical resources are limited. Nevertheless, it is a great possibility for the communication technology to advance. The technologies, which are able to cope with the new requirementes, are digital. This where the course on \emph{Digital Communication Systems} starts. You are warmly welcomed!
 
 \addcontentsline{toc}{section}{History of Communications}
@@ -22,9 +24,21 @@ Transferring information became more important as societies advanced.
 	\item In the 18th century, semaphore lines had been built. They used visual telegraphy. Semaphores on fixed towers could display a set of symbols, which were relayed along the line.
 \end{itemize}
 
-\todo{Figure Caesar cipher}
-
-\todo{Semaphores, beacons, lighthouses}
+\begin{minipage}{0.45\linewidth}
+	\begin{figure}[H]
+		\centering
+		\includegraphics[width=\linewidth]{../chapter00/CaesarCipher.jpg}
+		\caption[Caesar cipher]{Caesar cipher. Each letter is replaced by another one which is a fixed number of letters away from the original one. \licensequote{\cite{Berberich2013}}{Hubert Berberich}{Public Domain}}
+	\end{figure}
+\end{minipage}
+\hfill
+\begin{minipage}{0.45\linewidth}
+	\begin{figure}[H]
+		\centering
+		\includegraphics[width=\linewidth]{../chapter00/OpticalTelegraph.jpg}
+		\caption[Optical telegraph]{Optical telegraph \cite{WikiSemaphore}}
+	\end{figure}
+\end{minipage}
 
 The research of electricity created the foundations for modern communication systems. Electrical telegraphy speeded up telecommunication. At the end of the 19th century, electromagnetic waves have been discovered. James Clerk Maxwell postulated them in 1865. Heinrich Hertz produced the first electromagnetic waves in 1887. The potential had soon been acknowledged by inventors, who developed first radios. The era of analogue radio communication began. The \index{vacuum tube} vacuum tube became an important component in radio electronics.
 
@@ -68,3 +82,5 @@ Understanding digital communication systems is of great importance in many engin
 	\item \textbf{Energy Sector} -- 
 \end{itemize}
 
+\printbibliography[heading=subbibliography]
+\end{refsection}
diff --git a/chapter01/content.tex b/chapter01/content_ch01.tex
index 38706c1..aeadf28 100644
--- a/chapter01/content.tex
+++ b/chapter01/content_ch01.tex
@@ -1,5 +1,7 @@
 \chapter{Communication Systems}
 
+\begin{refsection}
+
 \section{What is Communication?}
 
 \index{communication}
@@ -369,3 +371,6 @@ This course on digital communication systems mainly considers the physical layer
 	\item \textbf{Mesh}, special form \emph{Full Mesh}
 \end{itemize}
 
+\printbibliography[heading=subbibliography]
+\end{refsection}
+
diff --git a/chapter01/exercise01.tex b/chapter01/exercise01.tex
new file mode 100644
index 0000000..9b939e9
--- /dev/null
+++ b/chapter01/exercise01.tex
@@ -0,0 +1,7 @@
+\phantomsection
+\addcontentsline{toc}{section}{Exercise 1}
+\section*{Exercise 1}
+
+\begin{enumerate}
+	\item What is the difference between a \emph{digital communication system} and a \emph{service}? To which OSI layers are they associated?
+\end{enumerate}
\ No newline at end of file
diff --git a/chapter02/content.tex b/chapter02/content_ch02.tex
index f22fc80..8a9ec88 100644
--- a/chapter02/content.tex
+++ b/chapter02/content_ch02.tex
@@ -1,5 +1,7 @@
 \chapter{Signals and Systems}
 
+\begin{refsection}
+
 All signals considered in this chapter are \index{signal!deterministic signal} \textbf{deterministic}, i.e., its values are predictable at any time. Especially, the values can be calculated by a mathematical equation. In contrast, \emph{random} signals are not predictable. Its values are subject to a random process, which must be modelled stochastically.
 
 \index{signal!time-continuous}
@@ -114,13 +116,13 @@ The phasor $\underline{X} \in \mathbb{C}$ is a complex number, which is mostly r
 
 \begin{figure}[H]
 	\centering
-	\begin{tikzpicture}

+	\begin{tikzpicture}
 	\draw[->] (-3.2,0) -- (3.2,0) node[below, align=left]{$\Re$};
 	\draw[->] (0,-3.2) -- (0,3.2) node[left, align=right]{$\Im$};
 	\draw[->, thick] (0, 0) -- (-40:3) node[right, align=left]{Complex phasor $\underline{X}$\\ (position at $t = 0$)};
 	\draw (0:1.5) arc(0:-40:1.5) node[midway, right, align=left]{Phase $\varphi_0$};
 	
-	\draw[->, dashed] (-50:1) arc(-50:30:1) node[right, align=left]{$\omega_0$};

+	\draw[->, dashed] (-50:1) arc(-50:30:1) node[right, align=left]{$\omega_0$};
 	\end{tikzpicture}
 	\caption{Phasor in the complex plane}
 	\label{fig:ch02:cmplxplane_phasor}
@@ -449,3 +451,6 @@ The Fourier transform of the Dirac delta function is the frequency-independent c
 \subsection{Convolution}
 
 \subsection{Poles and Zeroes}
+
+\printbibliography[heading=subbibliography]
+\end{refsection}
diff --git a/common/settings.tex b/common/settings.tex
index 0e73eb1..e98b536 100644
--- a/common/settings.tex
+++ b/common/settings.tex
@@ -1,7 +1,7 @@
 \documentclass[%
 	a4paper,%				A4 Papier
 	twoside,%				einseitig (linker und rechter Seitenrand sind gleich groß)
-	bibliography=totocnumbered,%	Literaturverzeichnis nummeriert mit ins
+	%bibliography=totocnumbered,%	Literaturverzeichnis nummeriert mit ins
 	                           % Inhaltsverzeichnis einfügen
 	numbers=noenddot,%		hinter der Gliederungsnummer soll kein Punkt gesetzt werden (siehe Duden)
 	parskip=half,%			europäischer Satz mit Abstand zwischen Absätzen
@@ -177,8 +177,38 @@
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % Bibliography
 
-%\usepackage{bibgerm}
-%\usepackage[numbers]{natbib}
+%\usepackage[square, numbers, sectionbib]{natbib}
+%\usepackage{chapterbib}
+%\def\thebibfile{../DCS}
+%\def\thebibstyle{unsrtnat}
+%
+%\makeatletter

+%\renewenvironment{thebibliography}[1]

+%{\section*{\bibname}% <-- this line was changed from \chapter* to \section*

+%	\@mkboth{\MakeUppercase\bibname}{\MakeUppercase\bibname}%

+%	\list{\@biblabel{\@arabic\c@enumiv}}%

+%	{\settowidth\labelwidth{\@biblabel{#1}}%

+%		\leftmargin\labelwidth

+%		\advance\leftmargin\labelsep

+%		\@openbib@code

+%		\usecounter{enumiv}%

+%		\let\p@enumiv\@empty

+%		\renewcommand\theenumiv{\@arabic\c@enumiv}}%

+%	\sloppy

+%	\clubpenalty4000

+%	\@clubpenalty \clubpenalty

+%	\widowpenalty4000%

+%	\sfcode`\.\@m}

+%{\def\@noitemerr

+%	{\@latex@warning{Empty `thebibliography' environment}}%

+%	\endlist}

+%\makeatother
+
+%\usepackage[square, numbers, sectionbib]{natbib}
+%\usepackage[backend=bibtex,style=unsrtnat]{biblatex}
+\usepackage[backend=biber,sorting=none]{biblatex}
+\addbibresource{../DCS.bib}
+%\bibliography{../DCS}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % Directories
@@ -233,6 +263,11 @@
 	hidelinks]{hyperref}
 
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Own commands
+
+\newcommand{\licensequote}[3]{\textit{Reproduced from #1. Copyright by #2. License: #3.}}
+
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % Own environments
diff --git a/main/DCS.tex b/main/DCS.tex
index 3986e61..595d615 100644
--- a/main/DCS.tex
+++ b/main/DCS.tex
@@ -48,13 +48,13 @@
 
 \setcounter{chapter}{-1}
 
-\input{../chapter00/content.tex}
+\input{../chapter00/content_ch00.tex}
 \clearpage
 
-\input{../chapter01/content.tex}
+\input{../chapter01/content_ch01.tex}
 \clearpage
 
-\input{../chapter02/content.tex}
+\input{../chapter02/content_ch02.tex}
 \clearpage
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -86,8 +86,8 @@
 \newpage
 
 % Print default index
-\phantomsection

-\addcontentsline{toc}{chapter}{Index}

+\phantomsection
+\addcontentsline{toc}{chapter}{Index}
 \printindex
 \newpage
 
diff --git a/main/chapter00.tex b/main/chapter00.tex
index c96a1b6..a452bbf 100644
--- a/main/chapter00.tex
+++ b/main/chapter00.tex
@@ -33,13 +33,16 @@
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % Content
 
-\clearpage
 \input{../chapter00/preface.tex}
+\clearpage
 
 \setcounter{chapter}{-1}
 
+\input{../chapter00/content_ch00.tex}
+\clearpage
+
+\input{../chapter00/exercise00.tex}
 \clearpage
-\input{../chapter00/content.tex}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % Appendix
@@ -74,8 +77,8 @@
 \newpage
 
 % Print default index
-\phantomsection

-\addcontentsline{toc}{chapter}{Index}

+\phantomsection
+\addcontentsline{toc}{chapter}{Index}
 \printindex
 \newpage
 
diff --git a/main/chapter01.tex b/main/chapter01.tex
index 2e63445..33f8ba2 100644
--- a/main/chapter01.tex
+++ b/main/chapter01.tex
@@ -35,8 +35,8 @@
 
 \setcounter{chapter}{0}
 
+\input{../chapter01/content_ch01.tex}
 \clearpage
-\input{../chapter01/content.tex}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % Appendix
@@ -72,7 +72,7 @@
 
 % Print default index
 \phantomsection
-\addcontentsline{toc}{chapter}{Index}

+\addcontentsline{toc}{chapter}{Index}
 \printindex
 \newpage
 
diff --git a/main/chapter02.tex b/main/chapter02.tex
index b7b11c7..213ad45 100644
--- a/main/chapter02.tex
+++ b/main/chapter02.tex
@@ -35,8 +35,8 @@
 
 \setcounter{chapter}{1}
 
+\input{../chapter02/content_ch02.tex}
 \clearpage
-\input{../chapter02/content.tex}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % Appendix