Please see the questions bellow I just need the write up part. which is \" descr

Question

Please see the questions bellow I just need the write up part. which is " description of what you did and a paragraph or so on what you heard " you dont have to do the everything if you can write that.

""Install SDR# Sharp software(it’s free software) and Using Matlab Develop the following .wav files. You will need to create a .1 second file at a sampling rate that is at least 48KHz. You might try much higher.The .wav file will be I and Q samples. After creating the .wav files using MATLAB, play them in SDR# Sharp. Try them with various types of detectors.Hand in a description of what you did and a paragraph or so on what you heard as you listened to each file with each detector . Note any interesting features.

a sampling rate that is at least 48KHz.

a.AM-DSB-TC with carrier frequency 10 KHz and sine wave modulating frequency 2 KHz.

b.AM-DSB-SC with carrierfrequency 8 KHz and modulating frequency1KHz

c.AM-SSB-USB with carrier frequency 15 KHz modulating frequency 900 Hz.

d.AM-SSB-LSB with carrier frequency 13KHz modulating frequency1KHz

e.Two AM-DSB-TC signals (1) Carrier 8 kHz, Modulation 1.5 KHz; (2) Carrier 12 KHz,modulation800 Hz.

f.Two AM-DSB-SC signals(1) Carrier9 kHz, Modulation 850KHz; (2) Carrier 13 KHz,modulation1.5KHz.

g.A combination of (a) and(c) from above

h.A combination of (b) and (d) from above

Exapmle of MATLAB Codes.""

Explanation / Answer

MATLAB COD

% task 1
fc=8000;
% task 2
fm=1000;
fs=100*fc;
t=0:1/fs:4/fm;
xc=cos(2*pi*fc*t);
xm=cos(2*pi*fm*t);
figure(1)
subplot(2,1,1),plot(t,xc);
title('carrier signal of 8khz');
xlabel('time (sec)');
ylabel('amplitude');
subplot(2,1,2),plot(t,xm);
title('message signal of 8 khz');
xlabel('time (sec)');
ylabel('amplitude');
% DSB-SC MODULATION
z1= xm.*xc;
figure(2)
% task 3.1
subplot(2,1,1),plot(t,z1);
title('DSB-SC MODULATION IN TIME DAOMAIN');
xlabel('time (sec)');
ylabel('amplitude');
% task 3.2
l1=length(z1);
f=linspace(-fs/2,fs/2,l1);
Z1=fftshift(fft(z1,l1)/l1);
subplot(2,1,2),plot(f,abs(Z1));
title('DSB SC MODULATION IN FREQUENCY DOMAIN');
xlabel('frequency(hz)');
ylabel('amplitude');
axis([-200000 200000 0 0.3]);
% task 3.3 demodulation
s1=z1.*xc;
S1=fftshift(fft(s1,length(s1))/length(s1));
figure(3)
plot(f,abs(S1));
title(' demodulated signal IN FREQUENCY DOMAIN before filtring');
xlabel('frequency(hz)');
ylabel('amplitude');
axis([-200000 200000 0 0.3]);
hold on
Hlp=1./sqrt(1+(f./fc).^(2*100));
plot(f,Hlp,'g');
title(' frequency response of low pass filter');
xlabel('frequency(hz)');
ylabel('amplitude');
axis([-200000 200000 0 2]);
% task 3.4
E1=Hlp.*S1;
figure(4)
subplot(2,1,1),plot(f,E1);
title(' Recover signal IN FREQUENCY DOMAIN after filtring');
xlabel('frequency(hz)');
ylabel('amplitude');
axis([-200000 200000 0 0.3]);
e1=ifft(ifftshift(E1))*length(E1);
subplot(2,1,2),plot(t,(1/0.5)*e1);
title(' Recover signal IN Time DOMAIN after filtring');
xlabel('time(sec)');
ylabel('amplitud[cc lang=”Matlab”]clc;
clear all;
close all;

A. Amlitude Modulation DSB-TC with carrier frequrency of 10KHz and a sin wave modulation frequency of 2 KHz

%task1

fc=10Khz

%task2

fm=fc/10

sin wave=2KHz

t=0:0.001:1;
set(0,‘defaultlinelinewidth’,2);
A=5;%Amplitude of signal
fm=input(‘Message frequency=’);%Accepting input value
fc=input(‘Carrier frequency=’);%Accepting input value (f2>f1)
mi=input(‘Modulation Index=’);%Modulation Index
Sm=A*sin(2*pi*fm*t);%Message Signal
subplot(3,1,1);%Plotting frame divided in to 3 rows and this fig appear at 1st
plot(t,Sm);
xlabel(‘Time’);
ylabel(‘Amplitude’);
title(‘Message Signal’);
grid on;
Sc=A*sin(2*pi*fc*t);%Carrier Signal
subplot(3,1,2);
plot(t,Sc);
xlabel(‘Time’);
ylabel(‘Amplitude’);
title(‘Carrier Signal’);
grid on;
Sfm=(A+mi*Sm).*sin(2*pi*fc*t);%AM Signal, Amplitude of Carrier changes to (A+Message)
subplot(3,1,3);
plot(t,Sfm);
xlabel(‘Time’);
ylabel(‘Amplitude’);
title(‘AM Signal’);
grid on;[/cc]e');

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