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In this paper, the authors study the reliability of decisions of the MAP, Log-MAP, Max-Log-MAP and SOVA decoding algorithms for turbo codes, in terms of the a priori information, a posteriori information, extrinsic information and channel reliability. They also analyze how important an accurate estimate of channel reliability factor is to the good performances of the iterative turbo decoder. The simulations are made for parallel concatenation of two recursive systematic convolutional codes with a block interleaver at the transmitter, AWGN channel and iterative decoding with mentioned algorithms at the receiver.
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