Convolutional-Encoding-Decoding/threebit.m at master · shushantkumar/Convolutional-Encoding-Decoding · GitHub

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function res = threebit(dw)
% function to introduce 3 bit error in codeword

[a b]=size(dw);
t=1;

% first error generated
for i = 1:b
    temp = dw;
    if(dw(i)==0)
        temp(i)=1;
    else
        temp(i)=0;
    end

% second error generated
    for j = i+1:b
        temp2= temp;
        if(temp(j)==0)
        temp2(j)=1;
        elseif(temp(j)==1 )
        temp2(j)=0;
        end

% third error generated
    for p = j+1:b
        k= temp2;
        if(temp2(p)==0)
        k(p)=1;
        res(t,:)=k;
        t=t+1;
        elseif(temp2(p)==1)
        k(p)=0;
        res(t,:)=k;
        t=t+1;
        end
    end

    end
end