Doped De-Accumulator using BCJR Algorithm ?

2015 3 7
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Hello, I wrote a matlab code for the doped accumulator
function [accumulated_bits] = accumulator(uncoded_bits,P)
accumulated_bits=uncoded_bits;
coded_bits=zeros(1,length(uncoded_bits));
coded_bits(1) = uncoded_bits(1);
for i = 2:length(uncoded_bits)
coded_bits(i) = mod(coded_bits(i-1)+uncoded_bits(i),2);
end
for i=P:P:length(uncoded_bits)
accumulated_bits(i)=coded_bits(i);
end
but I didn't find how to implement a decoder for this doped accumulator (using the BCJR algo) Could you help me?

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