problem 2 for reference if you would like to help me with number 2 looks here: h

Question

problem 2 for reference

if you would like to help me with number 2 looks here: https://www.chegg.com/homework-help/questions-and-answers/prob-2-signal-m-t-400sinc-400mt-cos-200mt-modulates-carrier-signal-carrier-frequency-fe-10-q18179460

Prob. 4. Consider the signal m(t) in Prob. 2. In Matlab, program a function plotAM(fe, pu), which plots the time domain modulated signal between time t E 0.01s, 0.01 s, with carrier fre- quency fe, and modulation index Au as the input parameters. You need to hand in the following (a) The Matlab code (b) Time domain plots of the modulated signals for (fe, Au) 250, 1), (fe, Au) (2500, 0.6), (fe, Au) (2500, 1), and (fe, Au) 2500, 2 (c) Identify in which case over-modulation occurs

Explanation / Answer

Over modulation occurs only when the the modulation index is more than 1. So, out of the given problems, (2500,2) case will be responsible for the over modulation case since here modulation index is 2 (which is >1).

In the question, it is provided that the carrier signal has a frequency f=10000Hz=10KHz. No information is provided regarding the amplitude of the carrier signal.

The following is the matlab code. This has to be saved in a file plotAM.m

function =plotAM(fc,m)

clc;
clear all;
disp('Modulation Index(m) cannot be negative quantity');
t=-.01:.001:.01;
disp('x(t) is the modulating or baseband signal and it will be represented as x');
x=cos(200*pi*t)+400*(sin(400*pi*t)/(400*pi*t));
disp('p(t) is the carrier signal');
p=(x/m)*cos(2*pi*fc*t);
disp('a(t) is the amplitude modulated signal');
a=(x+x/m)*cos(2*pi*10000*t);
% expression of AM signal is a(t)=(x(t)/m+x(t)).cos(2*pi*f*t) %
plot(t,a);
title('Plot of amplitude modulated signal')
xlabel('Time in Sec')
ylabel('Amplitude')

Since MATLAB is a high priced software, currently I dont have a lincensed copy. Hence, I am not giving the plots. Run the commands in MATLAB command window. Job will be done

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