Suppose that I have two demodulation techniques, namely synchronous and asynchronous, and a given DSB/SC signal as y(t)=cos(20,800*pi*t)+cos(19,200*pi*t). Please help me to identify which demodulation technique will successfully demodulate the given DSB/SC signal. Give an explanation in an academic way. A1: Synchronous:Coherent DetectionUse MATLAB to simulate a synchronous/coherent detector using the local carrierg(t) = cos(@ct+do) and an appropriate LPF to demodulate the AM signals.y(t) = cos(at)m(t)s(t)m(t)LPFc(t) = cos(@_t)Figure 1: Block diagram of a coherent detector for AM demodulation A2: Asynchronous:Envelope DetectorUse MATLAB to simulate an envelope detector by firstly simulating the output of adiode and then the LPF that demodulates the AM signal. Compare with theory.R₂r(t)y(t)AM InputsignalDiodeCR₁Ls(t)outputFigure 2: Generic circuit diagram of envelope detector used for AMdemodulation

Given:A DSB-SC signal,we need to identify: which demodulation technique will successfully demodulate…

Answered: Suppose that I have two demodulation…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

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Suppose that I have two demodulation techniques, namely synchronous and asynchronous, and a given DSB/SC signal as y(t)=cos(20,800*pi*t)+cos(19,200*pi*t). Please help me to identify which demodulation technique will successfully demodulate the given DSB/SC signal. Give an explanation in an academic way.

A1: Synchronous:
Coherent Detection
Use MATLAB to simulate a synchronous/coherent detector using the local carrier
g(t) = cos(@ct+do) and an appropriate LPF to demodulate the AM signals.
y(t) = cos(at)m(t)
s(t)
m(t)
LPF
c(t) = cos(@_t)
Figure 1: Block diagram of a coherent detector for AM demodulation

A2: Asynchronous:
Envelope Detector
Use MATLAB to simulate an envelope detector by firstly simulating the output of a
diode and then the LPF that demodulates the AM signal. Compare with theory.
R₂
r(t)
y(t)
AM Input
signal
Diode
C
R₁
L
s(t)
output
Figure 2: Generic circuit diagram of envelope detector used for AM
demodulation

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