diff options
Diffstat (limited to 'doc/thesis/chapters')
| -rw-r--r-- | doc/thesis/chapters/implementation.tex | 52 |
1 files changed, 18 insertions, 34 deletions
diff --git a/doc/thesis/chapters/implementation.tex b/doc/thesis/chapters/implementation.tex index e9928b7..ad33424 100644 --- a/doc/thesis/chapters/implementation.tex +++ b/doc/thesis/chapters/implementation.tex @@ -261,7 +261,6 @@ def block_phase(self, start, end): return sphase * np.ones(nsamples) + freq * np.arange(0, nsamples) \end{lstlisting} - \section{Channel simulations} Here its possible to add some AWGN noise in the channel line. Different parameters can be changed like the noise voltage, time or the frequency offset. @@ -279,6 +278,22 @@ In this part the fading blocks for the simulation are added. Tow different types % %For the a first simulation with some fading the 16QAM simulation model has been extended with a FIR-Filter in the Chanel. The results of this simulation are shown in \figref{fig:simul16QAM} and \figref{fig:simul16QAM_1} as the blue Signal. +\begin{figure} + \centering + \input{figures/tikz/qpsk-sim-constellations-static} + \caption{ + Constellation diagrams for a simulated link using QPSK with AWGN and Rayleighan fading. + } +\end{figure} + +\begin{figure} + \centering + \input{figures/tikz/qpsk-sim-constellations-dynamic} + \caption{ + Constellation diagrams for a simulated link using QPSK with AWGN and Rayleighan fading. The paramters are: frequency offset of 0.2 \%, \SI{100}{\milli\volt} noise, dopper shift for \(v = \SI{2}{\meter\per\second}\), and a NLOS urban PDP. + } +\end{figure} + \subsection{Fading with Discrete-time model} For the statical version according to \ref{sec:discrete-time-model} to implement and illustrat the fading effect, a separate block was created and implemented in the channel. Nearer shown in \ref{lst:fir-block}. This block is based on a FIR filter. It can be displayed with a direct path or without one. With the help of this filter, the delay of the line of side paths are illustrated. In this block it is possible to simulate any number of these paths with different strengths, as long as there is an associated amplitude specified for each delayed path. Unfortunately, these simulation values do not correspond to the realety, because too many incalculable side effects occur, which aren't possiple to ilustrate in this simulation. @@ -356,7 +371,6 @@ It can also be chosen whish Statical model should be taken for the simulation Ra The power delay profile which specify the delay in time for each impulse need to be in sample. For this delay vector some realistic values are for the first delay when theirs non line of side should be zero. The second delayed path depend on the environment of measurement. In an indoor enviroment it is usually between \(1\cdot10^{-9}\) to \(1\cdot10^{-7}\) and in an outdoor environment between \(1\cdot10^{-7}\) to \(1\cdot10^{-5}\). The rest depends on on the bandwidth. - %TODO finish this paragraph %\begin{german} % @@ -371,9 +385,6 @@ The power delay profile which specify the delay in time for each impulse need to \skelpar[5]{ Simulate an example from the skript } - - - \subsection{Measurements} @@ -419,35 +430,8 @@ For generating the Byte error rate it is focus on byte-blocks of a specific leng return len(inp) \end{lstlisting} +\section{Technical pro -\begin{figure} - \includegraphics[width=\linewidth]{./figures/pdfs/qam_nogui.pdf} - \caption{GNU Radio Blocks} - \label{fig:simul16QAM_block} -\end{figure} - -\begin{figure} - \includegraphics[width=\linewidth]{./figures/screenshots/QAM16_Fading_2.png} - \caption{Simulation results} - \label{fig:simul16QAM} -\end{figure} - -\begin{figure} - \includegraphics[width=\linewidth]{./figures/screenshots/QAM16_Fading_2_.png} - \caption{Simulation results} - \label{fig:simul16QAM_1} -\end{figure} - -\begin{figure} - \includegraphics[width=\linewidth]{./figures/pdfs/qam_Hardware_1711.pdf} - \caption{GNU Radio Blocks Hardware} - \label{fig:simul16QAM_Hardware_Aufbau} -\end{figure} - -\begin{figure} - \includegraphics[width=\linewidth]{./figures/screenshots/QAM16_Hardware_1711.png} - \caption{Hardware results} - \label{fig:simul16QAM__Hardware} -\end{figure} +\section{Issue with the current implementation} % TODO: Picture of the setup |