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Iterative MAP Decoding for Serial Concatenated Convolutional Codes
Ambroze MA, Wade G, Tomlinson M
IEE Proceedings Communications, Volume 145, Number 2, pp. 53-59, 1998
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The paper provides detailed computational steps for implementing an iterative serial concatenated convolutional code (SCCC) decoder. These are based on maximum a posteriori probability (MAP) decoding of a single, rate 1/2, recursive, systematic convolutional code, which is reduced to easily implemented equations for forward and backward recursion. In particular, the crucial information exchange between MAP decoders is clarified. Simulation of a rate 1/3 SCCC with memory-2 codes and a coding delay of N=1000 shows a bit error rate of 10-6 for Eb/N0=1.5 dB, and gives a typical interleaver gain of N-3

Ambroze MA, Wade G, Tomlinson M