The Decision Reliability of MAP, Log-MAP, Max-Log-MAP and SOVA Algorithms for Turbo Codes

In this paper, we study the reliability of decisions of e Codes, Channel Reliability, e N comm llular, satellite and we also consider two improved versions, named Log-MAP two different or identical Recursi s, connected in p Fig. 1. The turbo encoder with rate 1/3. The first encoder operat ed b e u, i ond encoder p Lucian Andrei Perişoară, and Rodica Stoian th 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. We 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. Keywords—Convolutional Turbo D cision Reliability, Extrinsic Information, Iterative Decoding.