Design of LDPC Coded BICM in DVB Broadcasting Systems With Block Permutations

A new simplified structure of bit-interleaved coded modulation (BICM) for second generation digital video broadcasting (DVB) standards, such as DVB-T2, DVB-C2, and DVB-NGH is proposed. In the BICM of the DVB standards, parity and column-twist interleavers are employed in order to avoid possible performance degradation due to the structural weaknesses of the BICM scheme. In this paper, a new method is proposed of finding permutation-equivalent low-density parity-check codes that eliminate the BICM weaknesses without the column-twist interleaver, thereby simplifying the BICM structure of the DVB standards. The new code descriptions are found by applying a column permutation to the parity check matrices of the original codes in the DVB standards. The codes generated by these new descriptions have the same error correcting capability individually for a binary memoryless channel. However, the resulting BICM has a different structure that is free of weakness, called the less-capable check node.