display_x.m

用正交调制方法实现模拟调制

function display_x(x)
fs=100000;
Nfft=1024;
window=hamming(512);
noverlap=256;
dflag='none';
[Pxx,f]=psd(x,Nfft,fs,window,noverlap,dflag);%x的功率谱
figure
subplot(2,2,1)
plot(f,Pxx)
xlabel('f(HZ)');
ylabel('F(w)');
title('调制信号的功率谱');