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Redes de Computadoras

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<strong>Re<strong>de</strong>s</strong> <strong>de</strong> <strong>Computadoras</strong>, 2007/08<br />

s(t) = 1 + 4 π<br />

∞∑ sin ( (2n + 1)w o t )<br />

n=0<br />

2n + 1<br />

y por tanto, tras realizar el producto obtenemos<br />

s ASK (t) = sin(w c t) + 4 ∞∑ sin ( (2n + 1)w 0 t )<br />

sin(w c t).<br />

π 2n + 1<br />

n=0<br />

Si ahora aplicamos el cambio trigonométrico<br />

obtenemos que<br />

2 sin(α) sin(β) = cos(α − β) − cos(α + β) (C.3)<br />

s ASK (t) =<br />

(<br />

) (<br />

)<br />

sin(w c t) + 4 ∑ ∞ cos (2n+1)w 0t−w ct −cos (2n+1)w 0t+w ct<br />

2π n=0<br />

2n+1<br />

<strong>de</strong> don<strong>de</strong> se <strong>de</strong>duce que el espectro |S ASK (f)| es el que se muestra<br />

en la Figura:<br />

C.4 Modulación binaria en amplitud o ASK 596

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