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Iterative decoding techniques have gain popularity due to their performanceand their application in most communications systems. In this paper, we presenta new application of our iterative decoder on the GPCB (Generalized ParallelConcatenated Block codes) which uses cyclic permutations. We introduce a newvariant of the component decoder. After extensive simulation; the obtainedresult is very promising compared with several existing methods. We evaluatethe effects of various parameters component codes, interleaver size, blocksize, and the number of iterations. Three interesting results are obtained; thefirst one is that the performances in terms of BER (Bit Error Rate) of the newconstituent decoder are relatively similar to that of original one. Secondlyour turbo decoding outperforms another turbo decoder for some linear blockcodes. Thirdly the proposed iterative decoding of GPCB-BCH (75, 51) is about2.1dB from its Shannon limit.

Iterative decoding of Generalized Parallel Concatenated Block codes using cyclic permutations