Improving the Resolution in FFT

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Kutlu Yigitturk
Kutlu Yigitturk on 2 Jun 2021
Commented: Paul on 3 Jun 2021
I need to get an output like below.
But this is the output I get as a result of the code I wrote.
clc
clear all
close all
N = 5;
n = -N-2: 1 : N+2;
u = unit(n+N/2)-unit(n-N/2);
subplot(2,1,1);
stem(n,u);
grid
title('x(t)');
X = fftshift(fft(u));
subplot(2,1,2)
plot(n,abs(X))
grid
title('|X(w)|')
How can I do this, thank you very much for your help.

Accepted Answer

dpb
dpb on 2 Jun 2021
Look at documentation for nextpow2
  4 Comments
Paul
Paul on 3 Jun 2021
Keep in mind that the output of fft() will need to be adjusted if desired to have the phase of the end result approximate the phase of the DTFT of u.

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