A universal interleaver design for bit-interleaved QC-LDPC coded modulation

摘要

A universal design methodology for inter-leavers in bit-interleaved coded modulation (BICM) systems deploying binary irregular quasi-cyclic low-density parity-check (QC-LDPC) codes and higher-order modulation is presented. The interleaver is introduced to lower decoding threshold when higher-order modulation is adopted. For this purpose, an optimization procedure with modified numerical analysis as cost function is applied to derive good mapping distributions, which are used to describe the interleaver configuration. Decoding simulation, being consistent with numerical results shows that our method works effectively for LDPC coded modulation.