Design of Protograph-based LDPC Codes for DVB-S2 Systems

Since low-density parity-check (LDPC) codes have been studied and adopted in the DVB-S2 standard, many efforts have been made to improve their performance and optimize them up to the broadcasting standard. This paper proposes a family of protograph-based LDPC codes to provide a multi-rate coding for efficient DVB-S2 systems, considering low-complexity and excellent performance of the protograph codes. Moreover, we employ Bit Interleaved Code Modulation Iterative Decoding (BICM-ID) to enhance the performance of the ASK-modulated DVB systems. Both the protograph extrinsic information transfer (PEXIT) analysis and simulation results demonstrate the performance advantage of the proposed protograph-based LDPC codes over the conventional DVB-S2 codes for all the code rates. In particular, the proposed codes yield performance gains of more than 0.2 dB as compared to the conventional codes at high rates for 16-APSK modulations.