TY - JOUR
T1 - Design and Optimization of Protograph LDPC-Coded Multipulse PPM Systems over Poisson Channels
AU - Yang, Zhaojie
AU - Fang, Yi
AU - Zhang, Guohua
AU - Lau, Francis C.M.
N1 - Funding Information:
This work was supported in part by the NSF of China under Grant 62071131, in part by the RGC Research Impact Fund from the Hong Kong SAR, China, under Grant R5013-19, in part by Guangdong Basic and Applied Basic Research Foundation under Grant 2022B1515020086, and in part by the NSF of Guangdong Province under Grant 2019A1515011465.
Publisher Copyright:
© 2022 IEEE.
PY - 2022/9/1
Y1 - 2022/9/1
N2 - 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.
AB - 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.
KW - Free-space optical communication
KW - multipulse pulse-position modulation
KW - poisson channel
KW - protograph low-density parity-check
UR - http://www.scopus.com/inward/record.url?scp=85131757956&partnerID=8YFLogxK
U2 - 10.1109/TVT.2022.3179483
DO - 10.1109/TVT.2022.3179483
M3 - Journal article
AN - SCOPUS:85131757956
SN - 0018-9545
VL - 71
SP - 9586
EP - 9601
JO - IEEE Transactions on Vehicular Technology
JF - IEEE Transactions on Vehicular Technology
IS - 9
M1 - 9786657
ER -