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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

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