Root-Protograph-Based BICM-ID: A Reliable and Efficient Transmission Solution for Block-Fading Channels

Yi Fang, Guohua Zhang, Guofa Cai, Francis C.M. Lau, Pingping Chen, Guojun Han

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)


As a bandwidth-efficient technique, bit-interleaved coded modulation with iterative demapping and decoding (BICM-ID) has attracted much research attention in the field of wireless communication. In this paper, we put forth a joint design of root-protograph (RP) low-density parity-check (LDPC) codes and BICM-ID, referred to as RP-based BICM-ID (RP-BICM-ID), over block-fading (BF) channels so as to boost the throughput under limited bandwidth. To preserve the full-diversity property of RP codes, we propose an efficient modulation strategy for the RP-BICM-ID system by taking the fading-block length into consideration. We also analyze the outage-probability limit of the RP-BICM-ID systems to establish the fundamental lower-limit on their word-error-rate (WER) performance. Moreover, we conceive a multi-level protograph extrinsic information transfer (ML-PEXIT) algorithm to derive the asymptotic WER and bit error rate (BER) of the RP-BICM-ID systems over BF channels. As a further insight, we develop a novel unequal-error-protection (UEP) bit-to-symbol (B2S) mapping scheme for the RP-BICM-ID systems, which gives rise to an additional performance improvement. Analyses and simulations show that the proposed RP-BICM-ID systems can not only realize desirable spectral efficiency, but also obtain near-outage-limit performance over BF channels. Therefore, the proposed RP-BICM-ID systems are very promising in achieving high-reliability and high-rate transmissions under slow-fading wireless-communication environments.

Original languageEnglish
Article number8740906
Pages (from-to)5921-5939
Number of pages19
JournalIEEE Transactions on Communications
Issue number9
Publication statusPublished - Sept 2019


  • Block-fading (BF) channel
  • extrinsic information transfer (EXIT)
  • protograph low-density parity-check (LDPC) codes
  • spectral efficiency

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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