Scicos Diagram
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Base band single user QPSK spread-spectrum transmission chain

\epsfig{file=qpsk_etal_teb_diagr.eps,height=9cm}

Module


Contents

Description

\begin{figure}\centering
\scalebox{0.6}{%
\input{qpsk_etal_teb_1.pstex_t}}
\end{figure}
Figure 1: Direct sequence spread spectrum transmission chain

Context


Te       = 0.1;
Nu       = 4;
Nbit     = 2;
l_g      = 5;
Nc       = (2^l_g)-1;
ci_g1    = [21;21];
ci_g2    = [13;10];
coef_g1  = [9;9];
coef_g2  = [15;15];
nb_coef  = 127;
Nech     = 15;
N        = Nu*Nc;
N1       = N*Nech
r        = 0.35; 
fe       = Nech;

gain_em  = 1; 
gain_rec = 1/Nech;
pulse    = filter_tap(1,nb_coef,fe,r,1);

Nb_vec   = 10;
nb_event = 4;
Tfin     = Te*Nb_vec;
sigma    = 0.4;

Scope Results

\begin{figure}\begin{center}
\epsfig{file=qpsk_etal_teb_scope_1.eps,width=330.00pt}
\end{center}\end{figure}
Figure : Eye diagram of the received symbol

Used blocks

Authors

A. Layec