[matlab] general function of communication signal modulation Fourier transform

Catalog

The Fourier transform

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The Fourier transform

function [f,sf] = T2F(t,st)
%This is a function using the FFT function to calculate a signal's Fourier Translation
%Input is the time and the signal vectors,the length of time must greater than 2
%Output is the frequency and the signal spectrum
dt = t(2)-t(1);
T = t(end);
df = 1/T;
N = length(st);
f = (-(N/2)*df):df:((N/2)*df-df);
sf = fft(st);
sf = T/N*fftshift(sf);