Journal of Applied Sciences ›› 2014, Vol. 32 ›› Issue (1): 32-38.doi: 10.3969/j.issn.0255-8297.2014.01.006

• Communication Engineering • Previous Articles     Next Articles

Optimized Interleaver for Protograph LDPC Coded BICM with High Spectral Efficiency

DOU Jin-fang1, HE Shan-bao2, JIANG Ming3   

  1. 1. National key Laboratory of Science and Technology on Space Microwave,
    China Academy of Space Technology (Xi’an), Xi’an 710100, China
    2. China Academy of Space Technology, Beijing 100094, China
    3. National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China
  • Received:2012-03-08 Revised:2012-08-15 Online:2014-01-31 Published:2012-08-15

Abstract: As a crucial part in bit-interleavered coded modulation (BICM), protograph low-density paritycheck(P-LDPC) codes and interleavers can greatly improve the performance of a BICM system. In this paper, we use a modified EXIT analysis method to analyze thresholds for a P-LDPC coded BICM system
with high-order QAM in different variable degree matched mapping (VDMM) schemes. A general criterion for optimization of VDMM interleavers is proposed. Results of numerical analysis and simulation show correctness of the optimization criterion.

Key words: protograph, low-density parity-check (LDPC) codes, bit interleaved coded modulation (BICM)

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