encode_bit.m
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- function [output, state] = encode_bit(g, input, state)
- % Copyright 1996 Matthew C. Valenti
- % MPRG lab, Virginia Tech
- % for academic use only
- % This function takes as an input a single bit to be encoded,
- % as well as the coeficients of the generator polynomials and
- % the current state vector.
- % It returns as output n encoded data bits, where 1/n is the
- % code rate.
- % the rate is 1/n
- % k is the constraint length
- % m is the amount of memory
- [n,k] = size(g);
- m = k-1;
- % determine the next output bit
- for i=1:n
- output(i) = g(i,1)*input;
- for j = 2:k
- output(i) = xor(output(i),g(i,j)*state(j-1));
- end;
- end
- state = [input, state(1:m-1)];