Design and Optimization of Protograph LDPC-Coded Multipulse PPM Systems over Poisson Channels

Zhaojie Yang, Yi Fang, Guohua Zhang, Francis C.M. Lau

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)


Combining powerful error-correction codes (ECCs) with multipulse pulse-position modulation (MPPM) has great potential to realize high-throughput and high-reliability transmissions in free-space optical (FSO) communication systems. This paper conducts an insightful investigation on protograph low-density parity-check (PLDPC)-coded MPPM systems over Poisson channels. To be specific, we first put forward a novel type of constellations, referred to as irregular pulse-distribution (IPD) constellations, for MPPM. We also conceive a bit-level rate-adaptive (RA) scheme, which can exploit the structural property of the IPD constellations to significantly improve the convergence performance at the price of transmission-rate loss. Furthermore, with the aid of a modified protograph extrinsic information transfer (PEXIT) algorithm, we construct three enhanced PLDPC codes with code rates 1/2, 2/3 and 3/4 that exhibit excellent decoding thresholds over Poisson channels. The proposed PLDPC-coded MPPM systems with the use of the IPD constellations, RA scheme, and enhanced PLDPC codes are superior to the state-of-the-art counterparts.

Original languageEnglish
Article number9786657
Pages (from-to)9586-9601
Number of pages16
JournalIEEE Transactions on Vehicular Technology
Issue number9
Publication statusPublished - 1 Sept 2022


  • Free-space optical communication
  • multipulse pulse-position modulation
  • poisson channel
  • protograph low-density parity-check

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Applied Mathematics


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