In the QPSK modulator in the figure shown, the reference oscillator (as can be seen in the figure) is sinwct. Change the reference oscillator to coswct and plot the new constellation diagram

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In the QPSK modulator in the figure shown, the reference oscillator (as can be seen in the figure) is sinwct. Change the reference oscillator to coswct and plot the new constellation diagram
Datos binarios
de entrada f
Divi-
sor
de
bits
Bit de
reloj
1
Q
Canal I, f/2
1 lógico = +1 V
0 lógico = -1 V
Oscilador de
portadora de
referencia
(sen w t)
1 lógico = +1 V
0 lógico = -1 V
Canal Q f/2
Modulador
balanceado
sen t
Desplazamiento
de fase 90°
± sen ot
cos t
Modulador
balanceado
Filtro
pasabanda
Sumador
lineal
Filtro
pasabanda
± cos w t
BPF
Salida
QPSK
Transcribed Image Text:Datos binarios de entrada f Divi- sor de bits Bit de reloj 1 Q Canal I, f/2 1 lógico = +1 V 0 lógico = -1 V Oscilador de portadora de referencia (sen w t) 1 lógico = +1 V 0 lógico = -1 V Canal Q f/2 Modulador balanceado sen t Desplazamiento de fase 90° ± sen ot cos t Modulador balanceado Filtro pasabanda Sumador lineal Filtro pasabanda ± cos w t BPF Salida QPSK
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