SER performance investigation of UWOC system over composite EGG oceanic turbulence fading channel with BSF

Abstract

In this work, the symbol error rate (SER) performance of a relay-assisted underwater wireless optical communication (UWOC) system has been investigated over the composite exponential-generalized gamma (EGG) distribution with the beam spread function (BSF) under two hard decision schemes of fixed decision threshold (FDT) and dynamic decision threshold (DDT). Specifically, the oceanic turbulence is assumed to follow the EGG distribution, and the impacts of absorption, scattering and misalignment loss are characterized by BSF. The cumulative distribution function (CDF) of this UWOC system is derived with the max-min criterion as the best path selection scheme. And with the help of Gauss-Laguerre quadrature function, the analytical SER expressions for these two threshold schemes are then achieved and validated by Monte Carlo (MC) simulation. Moreover, the SER performance is further studied under different temperature gradients, bubble levels (BLs) and water salinity over three water types, as well as the system structure parameters. Results show that the UWOC system with DDT scheme can efficiently overcome the error floor induced by FDT scheme and demonstrates better SER performance. Furthermore, the SER performance would be improved with lower BL, temperature gradients and water salinity as well as the concentration of dissolved particles. This work will benefit the design and research of relay-assisted UWOC system.

References

[1] JiangH, QiuH, HeN, et al.. Ergodic capacity and error performance of spatial diversity UWOC systems over generalized gamma turbulence channels[J]. Optics communications, 2022, 505: 127476

[2] KodamaT, SanusiM A B A, KoboriF, et al.. Comprehensive analysis of time-domain hybrid PAM for data-rate and distance adaptive UWOC system[J]. IEEE access, 2021, 9: 57064-57074

[3] KumarL B, KrishnanP. Multi-hop convergent FSO-UWOC system to establish a reliable communication link between the islands[J]. Optics communications, 2020, 474: 126107-126113

[4] YangL, ZhuQ, LiS, et al.. On the performance of mixed FSO-UWOC dual-hop transmission systems[J]. IEEE wireless communications letters, 2021, 10(9):2041-2045

[5] LuH, JiangM, ChengJ. Deep learning aided robust joint channel classification, channel estimation, and signal detection for underwater optical communication[J]. IEEE transactions on communications, 2021, 69(4):2290-2303

[6] ZediniE, OubeiH M, KammounA, et al.. Unified statistical channel model for turbulence-induced fading in underwater wireless optical communication systems[J]. IEEE transactions on communications, 2019, 67(4):2893-2907

[7] PhookanoP P, AneesS. Performance analysis of distributed alamouti based UWOC system[C], 2020, New York, IEEE: 1-5

[8] LeiH, ZhangY, ParkK H, et al.. Performance analysis of dual-hop RF-UWOC systems [J]. IEEE photonics journal, 2020, 12(2):1-15

[9] LiS, WangP, PangW, et al.. Performance analysis for cooperative communication system in optical IoUT network with HDAF strategy[J]. IEEE photonics journal, 2021, 13(3):1-22

[10] SaxenaP, BhatnagarM R. A simplified form of beam spread function in underwater wireless optical communication and its applications[J]. IEEE access, 2019, 7: 105298-105313

[11] LiA, WangP, PangW, et al.. ABER performance investigation of LDPC-coded multi-hop parallel underwater wireless optical communication system[J]. Applied optics, 2020, 59(5):1353-1362

[12] BykhovskyD, ArnonS. Performance of spectral amplitude coded multiple pulse position modulation with non-uniform energy slots and fading[J]. Optics express, 2018, 26(22):29225-29230

[13] QinY, WangP, LiuX, et al.. Optical communication system with two decision thresholds over exponentiated Weibull fading channels[J]. Optics communications, 2018, 424: 91-97

[14] DuY, LiS, WangP, et al.. Performance analysis of multi-hop underwater wireless optical communication system with space-time block codes considering the impact of beam spread function[J]. Optical engineering, 2022, 61(3):15602303

[15] PanY, WangP, WangW, et al.. Statistical model for the weak turbulence-induced attenuation and crosstalk in free space communication systems with orbital angular momentum[J]. Optics express, 2021, 29(8): 12644-12662

[16] DongY T S, ZhangX. Effect of random sea surface on downlink underwater wireless optical communications[J]. IEEE communications letters, 2013, 17(11):2164-2167

[17] ConcusP, CassattD, JaehnigG, et al.. Tables for the evaluation of ∫0∞xβe−xf(x)dx\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$\int\limits_0^\infty {{x^\beta}{e^{- x}}f\left(x \right)dx}$$\end{document} by Gauss-Laguerre quadrature [J]. Mathematics of computation, 1963, 17: 245