Canal de Propagation - Martial COULON
Canal de Propagation - Martial COULON
Canal de Propagation - Martial COULON
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Caractérisation d’un canal <strong>de</strong> Rayleigh :<br />
y ( t)<br />
= α(<br />
t)<br />
s(<br />
t)<br />
+ n(<br />
t)<br />
α(t) : variable aléatoire gaussienne complexe <strong>de</strong> moyenne nulle<br />
r(t)=|α(t)| : variable <strong>de</strong> Rayleigh, <strong>de</strong> <strong>de</strong>nsité <strong>de</strong> probabilité :<br />
p<br />
2<br />
r ⎛ r ⎞<br />
r)<br />
= exp⎜<br />
⎟ , ≥<br />
2 − r<br />
σ ⎝ 2σ<br />
⎠<br />
(<br />
2<br />
0<br />
<strong>de</strong>nsité <strong>de</strong> probabilité<br />
0.7<br />
0.6<br />
0.5<br />
0.4<br />
0.3<br />
0.2<br />
loi théorique<br />
loi expérimentale<br />
0.1<br />
0<br />
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5<br />
amplitu<strong>de</strong>s<br />
41