m3_fig.m

调制识别：基于决策论的通信信号调制识别实现

clear;fb=500;fc=2000;fs=12000;Ac=1;
for i=1:30
    for k=1:100
    d4=randint(1,300,4);d8=randint(1,300,8);
    s2=ask4(d4,fb,fc,fs,Ac);s3=ask8(d8,fb,fc,fs,Ac);
    ss2=awgn(s2,i,'measured');ss3=awgn(s3,i,'measured');
    Ma32(k)=M3_func(ss2);Ma33(k)=M3_func(ss3);
    end
    M32(i)=mean(Ma32);M33(i)=mean(Ma33);
end
plot(M32,'-*');hold on;
plot(M33,'-^');
xlabel('snr');ylabel('M3');
grid
legend('ask4','ask8',0);