A novel LDPC decoder for DVB-S2 IP

Abstract—In this paper a programmable Forward Error Correction (FEC) IP for a DVB-S2 receiver is presented. It is composed of a Low-Density Parity Check (LDPC), a Bose-ChaudhuriHoquenghem (BCH) decoder, and pre- and postprocessing units. Special emphasis is put on LDPC decoding, since it accounts for the most complexity of the IP core by far. We propose a highly efficient LDPC decoder which applies Gauss-Seidel decoding. In contrast to previous publications, we show in detail how to solve the well known problem of superpositions of permutation matrices. The enhanced convergence speed of Gauss-Seidel decoding is used to reduce area and power consumption. Furthermore, we propose a modified version of the λ-Min algorithm which allows to further decrease the memory requirements of the decoder by compressing the extrinsic information. Compared to the latest published DVB-S2 LDPC decoders, we could reduce the clock frequency by 40% and the memory consumption by 16%, yielding large energ...

• Type: Conference
• Year: 2009
• Where: DATE
• Authors: Stefan Müller 0004, Manuel Schreger, Marten Kabutz, Matthias Alles, Frank Kienle, Norbert Wehn
• Keywords: DATE 2009, Hardware, Ldpc Decoders, Low-density Parity Check, Programmable Forward Error