175 lines
4.7 KiB
TeX
175 lines
4.7 KiB
TeX
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\documentclass[a4paper]{article}
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\usepackage[T1]{fontenc}
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\usepackage[utf8]{inputenc}
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\usepackage{graphicx}
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\usepackage{amsmath}
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\usepackage{amsfonts}
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\usepackage{amssymb}
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\usepackage{color}
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\usepackage{caption}
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\usepackage[french]{babel}
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\usepackage[hidelinks=true]{hyperref}
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\usepackage{mathtools}
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\usepackage[nottoc, numbib]{tocbibind}
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%\usepackage[section]{placeins}
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\renewcommand\thesection{}
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\graphicspath{
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{./img/}
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}
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\usepackage[
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top=1.5cm,
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bottom=1.5cm,
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left=1.5cm,
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right=1.5cm
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]{geometry}
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\setlength{\parskip}{0.2cm}
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\setlength{\parindent}{0pt}
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\begin{document}
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\begin{figure}[t]
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\centering
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\includegraphics[width=5cm]{inp_n7.png}
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\end{figure}
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\title{
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\vspace{4cm}
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\textbf{Compte-rendu de TP} \\
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Introduction aux communications numériques \\
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Étude de chaines de transmission sur porteuse
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}
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\author{Laurent Fainsin}
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\date{
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\vspace{7cm}
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Département Sciences du Numérique \\
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Première année \\
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2020 — 2021
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}
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\maketitle
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\newpage
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\tableofcontents
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\newpage
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\section{Chaine passe-bas équivalente}
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\begin{figure}[ht!]
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\hspace{-1cm}
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\begin{tabular}{cc}
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\includegraphics[width=9.5cm]{trim_env_port.png} &
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\includegraphics[width=9.5cm]{trim_freq_port.png} \\
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\end{tabular}
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\caption{Aperçu du signal avant et après transposition en fréquence \label{fig : preview_signal}}
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\end{figure}
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\begin{figure}[ht!]
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\hspace{-1cm}
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\begin{tabular}{cc}
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\includegraphics[width=9.5cm]{trim_dsp_env_port.png} &
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\includegraphics[width=9.5cm]{trim_dsp_freq_port.png} \\
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\end{tabular}
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\caption{DSP du signal avant et après transposition en fréquence \label{fig : DSP_signal}}
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\end{figure}
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\begin{figure}[ht!]
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\hspace{-1cm}
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\begin{tabular}{cc}
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\includegraphics[width=9.5cm]{trim_oeil_port.png} &
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\includegraphics[width=9.5cm]{trim_teb_port.png} \\
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\end{tabular}
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\caption{\label{fig : oeil_teb}}
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\end{figure}
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On observe sur la figure \ref{fig : DSP_signal} le déplacement du spectre autour de la fréquence $f_p = 2 kHz$, le signal sur le canal n'est plus en bande de base.
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On remarque que le TEB du signal transmis sur porteuse et le TEB du signal transmis sur passe-bas équivalent sont identiques, ce qui est attendu. Le TEB est donné sur la figure \ref{fig : oeil_teb}.
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\newpage
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\section{Comparaison de modulations sur féquence porteuse}
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\begin{figure}[ht!]
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\hspace{-1cm}
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\begin{tabular}{cc}
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\includegraphics[width=9.5cm]{trim_ASK4_2.png} &
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\includegraphics[width=9.5cm]{trim_ASK4_4.png} \\
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\includegraphics[width=9.5cm]{trim_ASK4_6.png} &
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\includegraphics[width=9.5cm]{trim_ASK4_8.png} \\
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\end{tabular}
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\caption{Constellations de la modulation 4-ASK \label{fig : const_ASK4}}
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\end{figure}
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\newpage
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\begin{figure}[ph]
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\hspace{-1cm}
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\begin{tabular}{cc}
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\includegraphics[width=9.5cm]{trim_QPSK_2.png} &
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\includegraphics[width=9.5cm]{trim_QPSK_4.png} \\
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\includegraphics[width=9.5cm]{trim_QPSK_6.png} &
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\includegraphics[width=9.5cm]{trim_QPSK_8.png} \\
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\end{tabular}
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\caption{Constellations de la modulation QPSK \label{fig : const_QPSK}}
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\end{figure}
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\begin{figure}[ph]
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\hspace{-1cm}
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\begin{tabular}{cc}
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\includegraphics[width=9.5cm]{trim_PSK8_2.png} &
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\includegraphics[width=9.5cm]{trim_PSK8_4.png} \\
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\includegraphics[width=9.5cm]{trim_PSK8_6.png} &
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\includegraphics[width=9.5cm]{trim_PSK8_8.png} \\
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\end{tabular}
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\caption{Constellations de la modulation 8-PSK \label{fig : const_PSK4}}
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\end{figure}
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\begin{figure}[ph]
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\hspace{-1cm}
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\begin{tabular}{cc}
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\includegraphics[width=9.5cm]{trim_QAM16_2.png} &
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\includegraphics[width=9.5cm]{trim_QAM16_4.png} \\
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\includegraphics[width=9.5cm]{trim_QAM16_6.png} &
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\includegraphics[width=9.5cm]{trim_QAM16_8.png} \\
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\end{tabular}
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\caption{Constellations de la modulation 16-QAM \label{fig : const_QAM16}}
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\end{figure}
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\newpage
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\begin{figure}[ht!]
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\centering
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\includegraphics[width=17cm]{trim_mod_comp.png}
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\caption{TEB (lissées) des modulations \label{fig : comp_TEB}}
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\end{figure}
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\begin{figure}[ht!]
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\centering
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\includegraphics[width=17cm]{trim_dsp_comp.png}
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\caption{DSP (lissées) des modulations \label{fig : comp_DSP}}
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\end{figure}
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On a tracé sur la figure \ref{fig : comp_TEB} les TEB pour ces quatres modulations. On peut ainsi définir l'ordre d'efficacité en puissance :
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\begin{enumerate}
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\item QPSK
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\item 8-PSK
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\item 16-QAM
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\item 4-ASK
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\end{enumerate}
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On a tracé sur la figure \ref{fig : comp_DSP} les DSP de ces quatres modulations. On peut ainsi définir l'ordre d'efficacité spectral :
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\begin{enumerate}
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\item 16-QAM
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\item 8-PSK
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\item QPSK
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\item 4-ASK
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\end{enumerate}
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\end{document}
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