mssb.m

一些调幅信号的matlab仿真

dt=0.001;
fm=1;
fc=10;
T=5;
t=0:dt:T;
mt=sqrt(2)*cos(2*pi*fm*t);

s_ssb=real(hilbert(mt).*exp(j*2*pi*fc*t));
B=fm;
figure(1)
subplot(311),plot(t,s_ssb);hold on;
plot(t,mt,'r--');
title('SSB调制信号');
xlabel('t');

rt=s_ssb.*cos(2*pi*fc*t);
rt=rt-mean(rt);
[f,rf]=T2F(t,rt);
[t,rt]=lpf(f,rf,2*fm);

subplot(312);
plot(t,rt);hold on;
plot(t,mt/2,'r--');
title('相干解调后的信号与输入信号的比较');
xlabel('t');

subplot(313);
[f,sf]=T2F(t,s_ssb);
psf=(abs(sf).^2)/T;
plot(f,psf);
axis([-2*fc 2*fc 0 max(psf)]);
title('SSB信号功率谱');
xlabel('f');