Imprimir Pam p c
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TERAN RAMIREZ ARTURO ABEL Gestión 1/2012
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4 ELT 551 Tele-II UMSA
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5 ELT 551 Tele-II Facultad Técnica UMSA
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PAM ; Facultad Técnica UMSA Docente:Ing. Fabián Tito Luque
ELT 551 Tele-II
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Tipos de Modulación de impulsos
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.PAM
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Aplicación de 3-1.
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Aplicación de 3-1.
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MODULACIÓN PAM em
em+ DC
Em+ DC
EDC
EDC - Em
eo
Eo
KEO(E DC+Em)
KEO.E DC)
KEO(E DC-Em)
ζO
TO
TO
(a)
(b)
(c)
(d)
Fig. 3 – 2 - Formas de onda para análisis de PAM
PAM(Señal modulada)
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em+ DC
eo
PAM
Graficando
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No existe valoración de “α “ las
amplitudes de armónicas es
aleatorio Espectro de PAM
Espectro del tren de pulsos
(Angostos)
Espectro de señal modulante
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Espectro de señal PAM
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Para el análisis de una señal modulante genérica, se asume en general un
espectro genérico de la siguiente forma:
ωmax
ω
ωmax es la frecuencia máxima ( que
deseamos transmitir ) de la señal
modulante, la frecuencia mínima se
asume cero.
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Espectro de señal
PAM
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ωmax es la frecuencia máxima ( que deseamos
transmitir ) de la señal modulante, la frecuencia
mínima se asume cero.
Espectro del tren de pulsos angosto
No
se
mu
est
ra n
la
s fr
ec
ue
nc
ias
ne
ga
tiv
as
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Condición de Nyquist
(Se recupera información con filtro ideal) Espectros superpuestos
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ωo = 2.ωm + BG
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Res
umen
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TDM( ( Time Division Multiplex ( De señales PAM)
Con nivel DC
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_ Una sola portadora de periodo To muestrea los 4 canales. La frecuencia de la
portadora (o reloj) es: fportadora =1/To
_ La frecuencia de muestreo de cada canal será:
fs=fmuestreo= 1/4To
ELT 551 Tele-II Facultad Tecnología UMSA
P ara “n” canales será: fs=1/nTo
_ Cada señal se muestrea con un periodo de 4 To
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AM-DSB
ELT 551 Tele-II Facultad Tecnología UMSA
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Zi= Alta
Zo = baja
C ( Retención)
Zi
Zo
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30 Telecomunicaciones II ELT 551 UMSA Ing. Fabián Tito Luque