Performance Analysis of Reconfigurable Intelligent Surface-Assisted Underwater Wireless Optical Communication Systems
With the in-depth exploration of the ocean, the Internet of Underwater Things (IoUT) technology has attracted increasing attention. Underwater wireless optical communication (UWOC) provides the possibility of massive data transmission for IoUT. The underwater optical link of UWOC can be interrupted...
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IEEE
2024-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/10543023/ |
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| author | Qi Zhang Dian-Wu Yue Xian-Ying Xu |
| author_facet | Qi Zhang Dian-Wu Yue Xian-Ying Xu |
| author_sort | Qi Zhang |
| collection | DOAJ |
| description | With the in-depth exploration of the ocean, the Internet of Underwater Things (IoUT) technology has attracted increasing attention. Underwater wireless optical communication (UWOC) provides the possibility of massive data transmission for IoUT. The underwater optical link of UWOC can be interrupted by the obstruction of marine animals and plants, seamounts, and some underwater equipment. In this paper, we present a reconfigurable intelligent surface (RIS) assisted UWOC system to solve the problem of link occlusion. The cascaded turbulence channel fading coefficients from source to destination through RIS are modeled as Gamma-Gamma distribution, and the pointing errors caused by beam jitter and RIS jitter are considered. In the RIS-assisted UWOC systems with intensity modulation and direct detection (IM-DD), we apply the approximate distribution of the sum of Gamma-Gamma random variables to derive the probability density function (PDF) of the instantaneous received signal-to-noise ratio (SNR) for the first time. Based on the PDF, the novel closed-form expression of outage probability is given, and the outage probability analysis results show that when the number of reflecting elements is very large (i.e., tends to infinity), the outage probability asymptotically approaches zero. Subsequently, the closed-form expressions of the finite-SNR diversity order, the asymptotical diversity order, and the convergence speed of finite-SNR diversity order to asymptotical diversity order are proposed. Additionally, the ergodic channel capacity expression is investigated. Finally, we give simulation results to validate our derived results and analyze the impacts of the number of reflecting elements of RIS and the pointing errors on the above system performance indicators. |
| format | Article |
| id | doaj-art-4560a98908294103a0e7b46fbeec71ab |
| institution | Kabale University |
| issn | 1943-0655 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IEEE |
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| series | IEEE Photonics Journal |
| spelling | doaj-art-4560a98908294103a0e7b46fbeec71ab2025-08-20T03:33:11ZengIEEEIEEE Photonics Journal1943-06552024-01-0116411410.1109/JPHOT.2024.340788210543023Performance Analysis of Reconfigurable Intelligent Surface-Assisted Underwater Wireless Optical Communication SystemsQi Zhang0https://orcid.org/0000-0003-0058-9022Dian-Wu Yue1https://orcid.org/0000-0001-9866-0194Xian-Ying Xu2https://orcid.org/0000-0001-5136-0469College of Information Science and Technology, Dalian Maritime University, Dalian, ChinaCollege of Information Science and Technology, Dalian Maritime University, Dalian, ChinaSchool of Information Science and Engineering, Dalian Polytechnic University, Dalian, ChinaWith the in-depth exploration of the ocean, the Internet of Underwater Things (IoUT) technology has attracted increasing attention. Underwater wireless optical communication (UWOC) provides the possibility of massive data transmission for IoUT. The underwater optical link of UWOC can be interrupted by the obstruction of marine animals and plants, seamounts, and some underwater equipment. In this paper, we present a reconfigurable intelligent surface (RIS) assisted UWOC system to solve the problem of link occlusion. The cascaded turbulence channel fading coefficients from source to destination through RIS are modeled as Gamma-Gamma distribution, and the pointing errors caused by beam jitter and RIS jitter are considered. In the RIS-assisted UWOC systems with intensity modulation and direct detection (IM-DD), we apply the approximate distribution of the sum of Gamma-Gamma random variables to derive the probability density function (PDF) of the instantaneous received signal-to-noise ratio (SNR) for the first time. Based on the PDF, the novel closed-form expression of outage probability is given, and the outage probability analysis results show that when the number of reflecting elements is very large (i.e., tends to infinity), the outage probability asymptotically approaches zero. Subsequently, the closed-form expressions of the finite-SNR diversity order, the asymptotical diversity order, and the convergence speed of finite-SNR diversity order to asymptotical diversity order are proposed. Additionally, the ergodic channel capacity expression is investigated. Finally, we give simulation results to validate our derived results and analyze the impacts of the number of reflecting elements of RIS and the pointing errors on the above system performance indicators.https://ieeexplore.ieee.org/document/10543023/Underwater wireless optical communicationreconfigurable intelligent surfaceoutage probabilitydiversity orderergodic channel capacity |
| spellingShingle | Qi Zhang Dian-Wu Yue Xian-Ying Xu Performance Analysis of Reconfigurable Intelligent Surface-Assisted Underwater Wireless Optical Communication Systems IEEE Photonics Journal Underwater wireless optical communication reconfigurable intelligent surface outage probability diversity order ergodic channel capacity |
| title | Performance Analysis of Reconfigurable Intelligent Surface-Assisted Underwater Wireless Optical Communication Systems |
| title_full | Performance Analysis of Reconfigurable Intelligent Surface-Assisted Underwater Wireless Optical Communication Systems |
| title_fullStr | Performance Analysis of Reconfigurable Intelligent Surface-Assisted Underwater Wireless Optical Communication Systems |
| title_full_unstemmed | Performance Analysis of Reconfigurable Intelligent Surface-Assisted Underwater Wireless Optical Communication Systems |
| title_short | Performance Analysis of Reconfigurable Intelligent Surface-Assisted Underwater Wireless Optical Communication Systems |
| title_sort | performance analysis of reconfigurable intelligent surface assisted underwater wireless optical communication systems |
| topic | Underwater wireless optical communication reconfigurable intelligent surface outage probability diversity order ergodic channel capacity |
| url | https://ieeexplore.ieee.org/document/10543023/ |
| work_keys_str_mv | AT qizhang performanceanalysisofreconfigurableintelligentsurfaceassistedunderwaterwirelessopticalcommunicationsystems AT dianwuyue performanceanalysisofreconfigurableintelligentsurfaceassistedunderwaterwirelessopticalcommunicationsystems AT xianyingxu performanceanalysisofreconfigurableintelligentsurfaceassistedunderwaterwirelessopticalcommunicationsystems |