root/ossiedev/branches/hvolos/docs/ChannelLab/ChannelLab.tex @ 9405

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\title{OSSIE Lab \#: Using the Channel component}
\author{Haris I. Volos, \textit{et al}\\
Virginia Tech, Blacksburg, VA\\
Developed using OSSIE 0.7.x\\
}
\date{June 2009}

\begin{document}

\maketitle

\section{Acknowledgments}
This work was supported in part by NSF award \#0520418, and would not be possible without
the contributions of numerous students on the OSSIE team and other OSSIE users and
developers.

\section{Objective}
The objective of this lab is to familiarize the user with the Channel component

\section{Version}
This lab is for use with OSSIE version 0.7.x and the OSSIE Eclipse Feature (OEF), running on a
computer or VMware image that uses Fedora Core 7 or Ubuntu 8.04. The TxDemo,
Channel and RxDemo components are required.

\section{Procedure}
\subsection{Procedure Overview}
\begin{enumerate}
 \item Using OEF, build the ChannelEval waveform with the TxDemo, Channel, and RxDemo components
 \item Run nodeBooter
 \item Run the waveform using different settings and observe the effect on the number of errors
\end{enumerate}

\subsection{Getting Started}
\subsection{Building the waveform}
\osfig{waveformOEF}{OEF Waveform Structure}
\osfig{blockdiagram}{Block Diagram}
\osfig{wfmproperties}{Initial Channel Component Properties}
\subsection{Theory}
SNR Estimation
\begin{equation}
SNR=10log(\frac{Rx}{Noise})
\end{equation}
AWGN BER Estimation (QPSK)
\begin{equation}
P_b=Q(\sqrt{\frac{E_s}{N_0}})=Q(\sqrt{SNR})
\end{equation}
\subsection{No fading}
Set the fading parameter to ``None''
\subsubsection{Very Low SNR}
Set the noise power to 98000000, which is equal to power of energy of the QPSK pulse generated by the TxDemo component. The resulting SNR=0 dB, and $E_b/N_0$=-3 dB.
\osfig{IQ0dB}{I-Q Diagram, 0 dB SNR}

Sample NodeBooter output:
\begin{lstlisting}[]
...
RxDemo errors: 171 / 1024
RxDemo errors: 158 / 1024
RxDemo errors: 155 / 1024
RxDemo errors: 160 / 1024
RxDemo errors: 168 / 1024
RxDemo errors: 175 / 1024
...
\end{lstlisting}
Average bit error=0.16
Theorical bit error=0.1587
\subsubsection{Low SNR}
Set noise power to 9800000
\osfig{IQ10dB}{I-Q Diagram, 10 dB SNR}
Sample NodeBooter output:
\begin{lstlisting}[]
...
RxDemo errors: 1 / 1024
RxDemo errors: 1 / 1024
RxDemo errors: 1 / 1024
RxDemo errors: 0 / 1024
RxDemo errors: 1 / 1024
RxDemo errors: 0 / 1024
...
\end{lstlisting}

Average bit error=7.5e-4
Theoretical bit error=7.83e-4

\subsubsection{Medium SNR}
Set noise power to 980000
\osfig{IQ20dB}{I-Q Diagram, 20 dB SNR}
Sample NodeBooter output:
\begin{lstlisting}[]
...
RxDemo errors: 0 / 1024
RxDemo errors: 0 / 1024
RxDemo errors: 0 / 1024
RxDemo errors: 0 / 1024
...
\end{lstlisting}

Average bit error, to low to be estimated
Theoretical bit error=7.67e-24

\subsection{Fading}
Set the fading parameter to ``Ricean''
Max. Doppler rate=0.001
\subsubsection{Rayleigh Fading}
Set the ``K fading factor'' to 0 (Rayleigh fading)
\osfig{IQK0EnvelopeFalse}{I-Q Diagram, SNR=20 dB, K=0}
\begin{lstlisting}[]
...
RxDemo errors: 258 / 1024
RxDemo errors: 313 / 1024
RxDemo errors: 346 / 1024
RxDemo errors: 756 / 1024
RxDemo errors: 124 / 1024
RxDemo errors: 595 / 1024
RxDemo errors: 263 / 1024
RxDemo errors: 540 / 1024
RxDemo errors: 148 / 1024
RxDemo errors: 279 / 1024
...
\end{lstlisting}
Average bit error=0.353
\subsubsection{Rayleigh Fading - Envelope Fading Only}
Set the ``K fading factor'' to 0 (Rayleigh fading)
Set the ``Envelope Fading Only'' to True
\osfig{IQK0EnvelopeTrue}{I-Q Diagram, SNR=20 dB, K=0, Envelope Fading Only}
\begin{lstlisting}[]
...
RxDemo errors: 0 / 1024
RxDemo errors: 0 / 1024
RxDemo errors: 0 / 1024
RxDemo errors: 48 / 1024
RxDemo errors: 2 / 1024
RxDemo errors: 20 / 1024
RxDemo errors: 0 / 1024
RxDemo errors: 0 / 1024
RxDemo errors: 0 / 1024
RxDemo errors: 0 / 1024
...
\end{lstlisting}
Average bit error=6.84e-3
\subsubsection{Ricean Fading}
Set the ``K fading factor'' to 10
Set the ``Envelope Fading Only'' to False
\osfig{IQK10EnvelopeFalse}{I-Q Diagram, SNR=20 dB, K=10}
Notice that there is a much less severe phase and amplitude shift
\begin{lstlisting}[]
...
RxDemo errors: 0 / 1024
RxDemo errors: 0 / 1024
RxDemo errors: 0 / 1024
RxDemo errors: 0 / 1024
RxDemo errors: 0 / 1024
RxDemo errors: 0 / 1024
RxDemo errors: 0 / 1024
RxDemo errors: 0 / 1024
RxDemo errors: 0 / 1024
...
\end{lstlisting}
Average bit error, to low to be estimated 



\end{document}