Low-rate coding using incremental redundancy for GLDPC codes

Mathieu Cunche 1 Valentin Savin 2 Vincent Roca 1 Ghassan Kraidy 2 Alexandre Soro 3 Jérôme Lacan 3
1 PLANETE - Protocols and applications for the Internet
Inria Grenoble - Rhône-Alpes, CRISAM - Inria Sophia Antipolis - Méditerranée
2 CEA-LETI - Laboratoire d'Electronique et des Technologies de l'Information
3 ISAE-SUPAERO - Institut Supérieur de l'Aéronautique et de l'Espace
Abstract : In this paper we propose a low-rate coding method, suited for application-layer forward error correction. Depending on channel conditions, the coding scheme we propose can switch from a fixed-rate LDPC code to various low-rate GLDPC codes. The source symbols are first encoded by using a staircase or triangular LDPC code. If additional symbols are needed, the encoder is then switched to the GLDPC mode and extra-repair symbols are produced, on demand. In order to ensure small overheads, we consider irregular distributions of extra-repair symbols optimized by density evolution techniques. We also show that increasing the number of extra-repair symbols improves the successful decoding probability, which becomes very close to 1for sufficiently many extra-repair symbols.
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Mathieu Cunche, Valentin Savin, Vincent Roca, Ghassan Kraidy, Alexandre Soro, et al.. Low-rate coding using incremental redundancy for GLDPC codes. IEEE International Workshop on Satellite and Space Communications 2008 (IWSSC'08), Oct 2008, Toulouse, France. ⟨inria-00305684⟩

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