t2f.m

通信工程系统设计GMSK与FSK基于MATLAB的滤波设计

function [f,sf]=T2F(t,st)
%This is a function using the FFT function to calcylate a signal's Fourier
%Translation
%Input is the time and the signal vectors,the length of time must greater
%than 2
%output is 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);
% sf=fftshift(sf);