shuzijidai_jiance.m

这是关于无线通信基带检测的源程序

open('jiben_fd2');
initial_condition=[0,0];
start_time=0;
end_time=1;
w=100*pi;
h=input('采样率h=');

set_param('jiben_fd2','starttime',num2str(start_time));
set_param('jiben_fd2','stoptime',num2str(end_time));

t=h:h:end_time;
t=t';
signal=0.825*sin(w*t);
signal=[t signal];
m=input('编码长度m=')
a=round(rand(1,m));
sigma2=input('噪声方差=')

l0=1/h;
l1=length(a);
l2=(1/h)/l1;
for i=1:1:l1
    for j=(i-1)*l2+1:1:i*l2
        sig(j)=a(i);
        noise=normrnd(0,sqrt(sigma2),length(l0),1);
        signal2(j)=sig(j)+noise;
    end
end
signal2=signal2'
signal3=[t signal2']
k=0.5 %*(1+0.1*signal2)
sim('jiben_fd2'); 
for i=1:length(x2)
    if abs(x2(i))<0.2
        x3(i)=0;
    else x3(i)=1;
    end
end
p=~(sig==x3);
plot(p)