f2t.m

北邮《通信原理基于Matlab的计算机仿真》书的源码 m文件 好不容易弄来的

function [t st]=F2T(f,sf)
%This function calculate the time signal using ifft function for the input
%signal's spectrum

df = f(2)-f(1);
Fmx = ( f(end)-f(1) +df);
dt = 1/Fmx;
N = length(sf);
T = dt*N;

%t=-T/2:dt:T/2-dt;
t = 0:dt:T-dt;

sff = ifftshift(sf);
st = Fmx*ifft(sff);