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Fast Fourier Transform matlab code


AIM:
To verify Fast Fourier Transform.

EQUIPMENTS:

Operating System         – Windows XP
Constructor                  - Simulator
Software                      - CCStudio 3 & MATLAB 7.5

THEORY:

The Fast Fourier Transform is useful to map the time-domain sequence into a continuous function of a frequency variable. The FFT of a sequence {x(n)} of length N is given by a complex-valued sequence X(k).



PROGRAM:

%fast fourier transform

clc;
clear all;
close all;
tic;
x=input('enter the sequence');
n=input('enter the length of fft');
%compute fft
disp('fourier transformed signal');
X=fft(x,n)
subplot(1,2,1);stem(x);
title('i/p signal');
xlabel('n --->');
ylabel('x(n) -->');grid;
subplot(1,2,2);stem(X);
title('fft of i/p x(n) is:');
xlabel('Real axis --->');
ylabel('Imaginary axis -->');grid;





RESULT:




1 comments:

Alok Samal said...

sir, my name is ALOK RANJAN SAMAL. I am doing a project on active interference cancellation in cognitive radio ofdm system. My first aim to take an OFDM signal and then add some cancellation signal to it.but i am confused how to take amplitudes of cancellation signal at some specific frequency. please guide me ,sir .THANKS.

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