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Scalable and Parallel Codec Architectures for the DVB-S2 FEC System

Gomes, M. ; Falcão, G. ; Silva, V. ; Ferreira, V. F. ; Sengo, A. S. ; Falcão,

Scalable and Parallel Codec Architectures for the DVB-S2 FEC System, Proc IEEE Asia Pacific Conf. on Circuits and Systems - APCCAS , Macau, China, Vol. *, pp. * - *, November, 2008.

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Abstract
The recent Digital Video Satellite Broadcast Standard (DVB-S2) has adopted a powerful FEC scheme based on the serial concatenation of Bose-Chaudhuri-Hocquenghen (BCH) and Low-Density Parity-Check (LDPC) codes. The high speed requirements, long block lengths and adaptive encoding defined in the DVB-S2 standard, present complex challenges in the design of an efficient codec hardware architecture. In this paper, synthesizable, high throughput, scalable and parallel HDL models supporting the 21 different BCH+LDPC DVB-S2 code configurations are presented. For BCH decoding, an efficient Chien search circuit for shortened BCH codes is proposed. The LDPC codec architecture explores the periodicity of the special LDPC-IRA codes adopted by the standard. Synthesis results for an FPGA device from Xilinx show a throughput above the minimal 90Mbps.