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

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function res = encode(dw)
% function to encode input bit with the generating functions

% number of bits taken for calculating the codeword
k = 7;

% generating  functions (last bit assumed to be 0)
g1 = [1 1 0 1 0 1 0];
g2 = [1 1 1 0 1 1 0];

% shift register with input bit initial states
shiftreg = [0 0 0 0 0 0 0];

% iterator for codeword
j=1;

% travelling through the dataword
for i = dw

   % taking the input from dataword
   shiftreg(2:end) = shiftreg(1:end-1);
   shiftreg(1)=i;

   % loop for calculating the shiftreg * generating function
   for iter = 1:7
       w1(iter) = shiftreg(iter)*g1(iter);
       w2(iter) = shiftreg(iter)*g2(iter);
   end

    % calculating XOR of the elements after multiplying shiftreg and generating function
    temp1 =mod(sum(w1),2);
    temp2 =mod(sum(w2),2);

    % storing  the codeword generated
    res(j)=temp1;
    res(j+1)=temp2;
    j=j+2;
end

% this loop is for flushing the shift registers
for i = [0 0 0 0 0 0]

   % taking input from a empty vector
   shiftreg(2:end) = shiftreg(1:end-1);
   shiftreg(1)=i;

   % loop for calculating the shiftreg * generating function
   for iter = 1:7
       w1(iter) = shiftreg(iter)*g1(iter);
       w2(iter) = shiftreg(iter)*g2(iter);

   end

    % calculating XOR of the elements after multiplying shiftreg and generating function
    temp1 =mod(sum(w1),2);
    temp2 =mod(sum(w2),2);
    res(j)=temp1;

    % storing  the codeword generated
    res(j+1)=temp2;
    j=j+2;
end