Changeset 9406 for ossiedev/branches/hvolos/docs/ChannelLab/ChannelLab.tex

Timestamp:

06/10/09 17:13:12 (4 years ago)

Author:

hvolos

Message:

Updated text

Files:

• ossiedev/branches/hvolos/docs/ChannelLab/ChannelLab.tex (modified) (8 diffs)

ossiedev/branches/hvolos/docs/ChannelLab/ChannelLab.tex

@@ -65 +65 @@
 
 \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.
+This lab is for use with OSSIE version 0.7.x, the OSSIE Eclipse Feature (OEF), and ALF 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}
@@ -79 +77 @@
 \subsection{Getting Started}
 \subsection{Building the waveform}
+Using OEF build the ChannelEval waveform with the structure shown in \osref{waveformOEF}. In addition, \osref{blockdiagram} provides an alternative view of the waveform. Only the Channel component has configurable properties, set those properties according to \osref{wfmproperties}
 \osfig{waveformOEF}{OEF Waveform Structure}
 \osfig{blockdiagram}{Block Diagram}
 \osfig{wfmproperties}{Initial Channel Component Properties}
 \subsection{Theory}
-SNR Estimation
+The TxDemo transmits QPSK symbols with energy $7000^2+7000^2=98000000$ (both I and Q components have an amplitude of 7000).
+SNR Estimation in dB is given by:
 \begin{equation}
-SNR=10log(\frac{Rx}{Noise})
+SNR=10log(\frac{RxPower}{Noise})
 \end{equation}
 AWGN BER Estimation (QPSK)
@@ -94 +94 @@
 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.
+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 is 0 dB.
 \osfig{IQ0dB}{I-Q Diagram, 0 dB SNR}
 
@@ -108 +108 @@
 ...
 \end{lstlisting}
-Average bit error=0.16
-Theorical bit error=0.1587
+The average bit error equals 0.16 which is very close the theoretical bit error of 0.1587.
 \subsubsection{Low SNR}
 Set noise power to 9800000
@@ -124 +123 @@
 ...
 \end{lstlisting}
-
-Average bit error=7.5e-4
-Theoretical bit error=7.83e-4
+The Average bit error equals $7.5\times 10^{-4}$ which is also close to the theoretical bit error of $7.83\times 10^{-4}$
+
 
 \subsubsection{Medium SNR}
@@ -141 +139 @@
 \end{lstlisting}
 
-Average bit error, to low to be estimated
-Theoretical bit error=7.67e-24
+The average bit error is to low to be estimated, the theoretical bit error is $7.67\times 10^{-24}$.
 
 \subsection{Fading}
-Set the fading parameter to ``Ricean''
-Max. Doppler rate=0.001
+Set the fading parameter to ``Ricean'' and the ``Max. Doppler rate'' to 0.001. The theoretical bit error rate is not provided because is not as straightforward to estimate for the the conditions tested as the AWGN case.
 \subsubsection{Rayleigh Fading}
 Set the ``K fading factor'' to 0 (Rayleigh fading)
+It may be observed it the \osref{IQK0EnvelopeFalse} that both the amplitude and the phase of the received signal fluctuates.
 \osfig{IQK0EnvelopeFalse}{I-Q Diagram, SNR=20 dB, K=0}
 \begin{lstlisting}[]
@@ -164 +161 @@
 ...
 \end{lstlisting}
-Average bit error=0.353
+The average bit error equals to 0.353. 
 \subsubsection{Rayleigh Fading - Envelope Fading Only}
 Set the ``K fading factor'' to 0 (Rayleigh fading)
 Set the ``Envelope Fading Only'' to True
+
+It may be observed it the \osref{IQK0EnvelopeTrue} that only the amplitude of received signal fluctuates, there is not phase fluctuation.
 \osfig{IQK0EnvelopeTrue}{I-Q Diagram, SNR=20 dB, K=0, Envelope Fading Only}
 \begin{lstlisting}[]
@@ -183 +182 @@
 ...
 \end{lstlisting}
-Average bit error=6.84e-3
+Average bit error=$6.84\times 10^{-3}$
 \subsubsection{Ricean Fading}
 Set the ``K fading factor'' to 10
 Set the ``Envelope Fading Only'' to False
+It may be observed it the \osref{IQK10EnvelopeFalse} that both the amplitude and the phase of the received signal fluctuates less severely compared to the K=0 case.
 \osfig{IQK10EnvelopeFalse}{I-Q Diagram, SNR=20 dB, K=10}
-Notice that there is a much less severe phase and amplitude shift
+
 \begin{lstlisting}[]
 ...