Title :
Low-rate coding using incremental redundancy for GLDPC codes
Author :
Cunche, Mathieu ; Savin, Valentin ; Roca, Vincent ; Kraidy, Ghassan ; Soro, Alexandre ; Lacan, Jérôme
Author_Institution :
INRIA Rhone-Alpes, Grenoble
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 1 for sufficiently many extra-repair symbols.
Keywords :
decoding; forward error correction; parity check codes; GLDPC codes; application-layer forward error correction; decoding probability; density evolution techniques; extra-repair symbols; fixed-rate LDPC code; incremental redundancy; low-rate coding; Block codes; Channel capacity; Digital video broadcasting; Error correction codes; Forward error correction; Hydrogen; Iterative decoding; Parity check codes; Physical layer; Switches;
Conference_Titel :
Satellite and Space Communications, 2008. IWSSC 2008. IEEE International Workshop on
Conference_Location :
Toulouse
Print_ISBN :
978-1-4244-1947-0
Electronic_ISBN :
978-1-4244-1948-7
DOI :
10.1109/IWSSC.2008.4656817