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yudiandida

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[ÇóÖú] matlabÖÐÀûÓÃFFT½øÐÐFourier±ä»»ºóÕæÊµÆµÂÊfÖµ¼ÆËãÎÊÌâ ÒÑÓÐ4È˲ÎÓë

CODE:
clear;
clc;
f1 = 3e8/1550e-9;
f2 = 10e9;
N = 2000;
fs = 2e12;
t = (0:N-1)/fs;
f = ((0:N-1)*fs/N-fs/2).*10^3;
A = 20;
Y1 = cos(pi/4*cos(2*pi*f2*t)-pi/4).^2.*cos(2*pi*f1*t+pi/2+A*(cos(2*pi*f2*t)-1/16*cos(2*2*pi*f2*t)));
Y2 = Y1.*exp(i*2*pi*f1*t);
Z1 = fft(Y2);
Z2 = fftshift(Z1);
plot(f,abs(Z2))
axis([-0.3e15,0.3e15,0,120])

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