The BER performance of the LDPC-coded MPPM over turbulence UWOC channels

Tools

Jiang, Hongyan and He, Ning and Popoola, Wasiu and Rajbhandari, Sujan (2022) The BER performance of the LDPC-coded MPPM over turbulence UWOC channels. Photonics, 9 (5). 349. ISSN 2304-6732 (https://doi.org/10.3390/photonics9050349)

[thumbnail of Jiang-etal-Photonics-2023-The-BER-performance-of-the-LDPC-coded-MPPM]
Preview
 Text. Filename: Jiang_etal_Photonics_2023_The_BER_performance_of_the_LDPC_coded_MPPM.pdf
Final Published Version
License: Creative Commons Attribution 4.0 logo
Download (2MB)| Preview

Abstract

Turbulence-induced fading is a critical performance degrading factor for underwater wireless optical communication (UWOC) systems. In this paper, we propose a quasi-cyclic (QC) low-density parity-check (LDPC) code with multiple-pulse-position modulation (MPPM) to overcome turbulence-induced fading. MPPM is adopted as a compromise between the low-power efficiency of on–off keying (OOK) and the low bandwidth efficiency of pulse position modulation (PPM). The bit error rate (BER) performance of LDPC-coded MPPM over turbulence UWOC channels is investigated. The log-likelihood ratio (LLR) of MPPM is derived, and a simplified approximation is used for iterative decoding. Subsequently, the closed-form expression of the BER, without forward error correction (FEC) code, is obtained for the generalized-gamma (GG) fading model. Finally, Monte-Carlo (MC) simulation results are provided to demonstrate the correctness of the derived closed-form expressions and the effectiveness of the LDPC code with simplified LLR to improve the BER performance for different MPPM formats over fading channels.

ORCID iDs

Jiang, Hongyan, He, Ning, Popoola, Wasiu and Rajbhandari, Sujan ORCID logoORCID: https://orcid.org/0000-0001-8742-118X;
CORE (COnnecting REpositories)