Abstract
The turbo decoding is a sub-optimal decoding, i.e. it is not a maximum likelihood decoding. It is important to be aware of this fact when the parameters for the scheme are chosen. This goes especially for the selection of component codes, where the selection often has been based solely on the performance at highSnr’s. We will show that it is important to base the choice on the performance at lowSnr’s. i.e. the convergence properties, as well. Further, the study of the performance with different component codes may lead to an understanding of the convergence process in the turbo decoder.
Résumé
Le turbo décodage est sous optimal car il n’est pas à maximum de vraisemblance. Il est important de tenir compte de ce fait pour choisir les paramètres du schéma de codage. Cela est particulièrement vrai pour le choix des codes élémentaires qui sont souvent sélectionnés en fonction de leur comportement à fort signal à bruit. L’auteur montre qu’il est aussi important de choisir ces codes en tenant compte de leurs performances à faible rapport signal à bruit. De plus, l’étude des performances des turbo codes avec différents codes élémentaires peut conduire à une meilleure compréhension du processus de convergence du turbo décodeur.
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Andersen, J.D. Selection of component codes for turbo coding based on convergence properties. Ann. Télécommun. 54, 208–213 (1999). https://doi.org/10.1007/BF02998581
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DOI: https://doi.org/10.1007/BF02998581