adjudg_1.m

数字基带传输系统的MATLAB仿真实现 function [sampl,re_sampl]=system_1(A,F,P,D,snr,m,N) 输入变量A ,F,P分别为输入信号的幅度、频率和相

function [adjudged_ami]=adjudg_1(ami_after_channel,m)
%输入信号ami_after_channel为经过AWGN信道后的AMI码型数字信号，m为判决门限值；输出变量adjudged_ami为抽样判决后的信号。
%加噪AMI码型数字序列抽样判决的MATLAB仿真实现
for i=1:length(ami_after_channel);
    temp=ami_after_channel;
    if (temp(i)>m)
        adjudged_ami(i)=1;
    elseif((temp(i)<m)&(temp(i)>-m))
        adjudged_ami(i)=0;
    else(temp(i)<-m)
        adjudged_ami(i)=-1;
    end
end
%画图
l=length(ami_after_channel);
for x=1:l*10
   m=ceil(x/10);
   adjudged_ami1(x)=adjudged_ami(m);
   ami_after_channel1(x)=ami_after_channel(m);
end
t=1:length(ami_after_channel1);
figure(5)
subplot(2,1,1)
plot(t,ami_after_channel1,'*g-');
axis([-0.2 300 -2.2 2.2]);
title('道加噪声的信号');
subplot(2,1,2)
plot(t,adjudged_ami1);
axis([-0.2 300 -1.2 1.2]);
title('抽样判决以后的AMI码');