m2_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
    d2=randint(1,300,2);d4=randint(1,300,4);d8=randint(1,300,8);
    s1=ask2(d2,fb,fc,fs,Ac);s2=ask4(d4,fb,fc,fs,Ac);s3=ask8(d8,fb,fc,fs,Ac);
    ss1=awgn(s1,i,'measured');ss2=awgn(s2,i,'measured');ss3=awgn(s3,i,'measured');
    Ma21(k)=M2_func(ss1);Ma22(k)=M2_func(ss2);Ma23(k)=M2_func(ss3);
    end
    M21(i)=mean(Ma21);M22(i)=mean(Ma22);M23(i)=mean(Ma23);
end
plot(M21,'-*')
hold on
plot(M22,'-^')
plot(M23,'-s')
xlabel('snr');ylabel('M2');
grid
legend('ask2','ask4','ask8',0);