On interleaver design for BICM system with low error-floors

In this paper, we propose a design rule of a modified quasi-cyclic structure for bit-interleaved coded modulation with iterative decoding (BICM-ID). The proposed structure is especially favorable for low-complexity hardware implementation. In addition, it will be shown that the proposed structure effectively removes low-weight codewords, which in turn greatly improves error-floor behaviors as compared to quasi-cyclic interleaver.