Jointly Decoded Raptor Codes: Analysis and Design for the BIAWGN Channel - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue EURASIP Journal on Wireless Communications and Networking Année : 2009

Jointly Decoded Raptor Codes: Analysis and Design for the BIAWGN Channel

Résumé

We are interested in the analysis and optimization of Raptor codes under a joint decoding framework, that is, when the precode and the fountain code exchange soft information iteratively. We develop an analytical asymptotic convergence analysis of the joint decoder, derive an optimization method for the design of efficient output degree distributions, and show that the new optimized distributions outperform the existing ones, both at long and moderate lengths. We also show that jointly decoded Raptor codes are robust to channel variation: they perform reasonably well over a wide range of channel capacities. This robustness property was already known for the erasure channel but not for the Gaussian channel. Finally, we discuss some finite length code design issues. Contrary to what is commonly believed, we show by simulations that using a relatively low rate for the precode (Rp≃0.9), we can improve greatly the error floor performance of the Raptor code.
Fichier principal
Vignette du fichier
Venkiah_2009_EURASIPJWCN.pdf (1.42 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-00521072 , version 1 (26-09-2010)

Identifiants

  • HAL Id : hal-00521072 , version 1

Citer

Auguste Venkiah, Charly Poulliat, David Declercq. Jointly Decoded Raptor Codes: Analysis and Design for the BIAWGN Channel. EURASIP Journal on Wireless Communications and Networking, 2009, 2009, Article ID 657970, 11 p. ⟨hal-00521072⟩
469 Consultations
132 Téléchargements

Partager

Gmail Facebook X LinkedIn More