v32_indiffcoding.m

matlab 代码,实现了ITU-T V.32建议的 modem 整体仿真实现。

function[O2,O1]=v32_indiffcoding(Y2,Y1)
O2(1)=Y2(1);O1(1)=Y1(1);
for k=2:length(Y2)
    if (Y2(k)==0&&Y1(k)==0&&Y2(k-1)==0&&Y1(k-1)==0)||(Y2(k)==1&&Y1(k)==0&&Y2(k-1)==1&&Y1(k-1)==0)||(Y2(k)==0&&Y1(k)==1&&Y2(k-1)==0&&Y1(k-1)==1)||(Y2(k)==1&&Y1(k)==1&&Y2(k-1)==1&&Y1(k-1)==1)
        O2(k)=0;O1(k)=0;
    end
    if (Y2(k)==1&&Y1(k)==0&&Y2(k-1)==0&&Y1(k-1)==0)||(Y2(k)==0&&Y1(k)==0&&Y2(k-1)==1&&Y1(k-1)==0)||(Y2(k)==1&&Y1(k)==1&&Y2(k-1)==0&&Y1(k-1)==1)||(Y2(k)==0&&Y1(k)==1&&Y2(k-1)==1&&Y1(k-1)==1)
        O2(k)=1;O1(k)=0;
    end    
    if (Y2(k)==0&&Y1(k)==1&&Y2(k-1)==0&&Y1(k-1)==0)||(Y2(k)==1&&Y1(k)==1&&Y2(k-1)==1&&Y1(k-1)==0)||(Y2(k)==1&&Y1(k)==0&&Y2(k-1)==0&&Y1(k-1)==1)||(Y2(k)==0&&Y1(k)==0&&Y2(k-1)==1&&Y1(k-1)==1)
        O2(k)=0;O1(k)=1;
    end
    if (Y2(k)==1&&Y1(k)==1&&Y2(k-1)==0&&Y1(k-1)==0)||(Y2(k)==0&&Y1(k)==1&&Y2(k-1)==1&&Y1(k-1)==0)||(Y2(k)==0&&Y1(k)==0&&Y2(k-1)==0&&Y1(k-1)==1)||(Y2(k)==1&&Y1(k)==0&&Y2(k-1)==1&&Y1(k-1)==1)
        O2(k)=1;O1(k)=1;
    end
end