display_s_pxxs.m

用正交调制方法实现模拟调制

function display_s_pxxs(I,Q)
fs=100000;
t=0:1/fs:0.001;
s=zhengjiao(I,Q);
subplot(2,2,3)
plot(t,s)
xlabel('t(s)');
ylabel('s(t)');
title('已调信号');
axis([0 0.001 -1.5 1.5])
Nfft=1024;
window=hamming(512);
noverlap=256;
dflag='none';
[Pxx,f]=psd(s,1024,fs,window,noverlap,dflag);
subplot(2,2,4)
plot(f,Pxx)
xlabel('f(HZ)');
ylabel('S(w)');