Performance analysis of underwater wireless optical communication system assisted by RIS for optimal transmission selection

ZHAO Gongnuo; YUE Dianwu; YANG Jianing; ZHANG Qi

doi:10.11959/j.issn.1000-0801.2025196

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Performance analysis of underwater wireless optical communication system assisted by RIS for optimal transmission selection

Topic: Technologies for Underwater Communication Networks | 更新时间：2025-11-06

- Performance analysis of underwater wireless optical communication system assisted by RIS for optimal transmission selection
- Telecommunications Science Vol. 41, Issue 10, Pages: 58-70(2025)
- 作者机构：
  
  1.大连海事大学信息科学技术学院，辽宁大连 116026
  2.福耀科技大学计算与人工智能学院，福建福州 350109
- 作者简介：
- 基金信息：
- DOI：10.11959/j.issn.1000-0801.2025196
  CLC： TN929
- Received：01 June 2025，
  
  Revised：2025-07-06，
  
  Accepted：14 July 2025，
  
  Published：20 October 2025
- 稿件说明：
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赵公诺,岳殿武,杨佳宁等.RIS辅助最优发射选择水下无线光通信系统性能分析[J].电信科学,2025,41(10):58-70.

ZHAO Gongnuo,YUE Dianwu,YANG Jianing,et al.Performance analysis of underwater wireless optical communication system assisted by RIS for optimal transmission selection[J].Telecommunications Science,2025,41(10):58-70.
赵公诺,岳殿武,杨佳宁等.RIS辅助最优发射选择水下无线光通信系统性能分析[J].电信科学,2025,41(10):58-70. DOI： 10.11959/j.issn.1000-0801.2025196.

ZHAO Gongnuo,YUE Dianwu,YANG Jianing,et al.Performance analysis of underwater wireless optical communication system assisted by RIS for optimal transmission selection[J].Telecommunications Science,2025,41(10):58-70. DOI： 10.11959/j.issn.1000-0801.2025196.

摘要

水下无线光通信（underwater wireless optical communication，UWOC）因最低的链路时延、最高的传输速率和最低的实施成本而被广泛应用于高速大容量的水下数据传输。在高传输速率下，即使是短时间的阻塞或遮挡也会导致突然的通信中断，从而造成大量传输信息的丢失。为解决通信链路被阻断的问题，并提高系统传输稳定性，提出一种基于可重构智能表面（reconfigurable intelligent surface，RIS）辅助的UWOC系统。具体研究过程如下。（1）将源端到目的端的级联湍流信道衰落系数建模为Gamma-Gamma分布，并考虑了波束抖动和RIS抖动引起的指向误差。（2）UWOC系统采用强度调制直接检测，发射光源可通过接收机的反馈切换至最佳光源进行通信传输。（3）推导了RIS辅助系统瞬时接收信噪比的概率密度函数。基于概率密度函数，给出了中断概率的闭式表达式。（4）推导出了有限信噪比分集阶数和高信噪比下的渐近分集阶数的闭式表达式。（5）通过蒙特卡罗模拟，验证了推导结果的正确性。理论分析与仿真实验均表明，增加发射光源数量，能够显著提升系统的传输稳定性。当发射光源数量和RIS块数乘积一定时，系统会有相同的渐近分集阶数。

Abstract

Underwater wireless optical communication(UWOC) has been widely used for high-speed and high-capacity underwater data transmission because of the lowest link delay

the highest transmission rate and the lowest implementation cost. At high transmission rates

even a short period of blockage or occlusion can lead to sudden communication interruption

which results in the loss of a large amount of transmitted information. To address the issue of communication link blockage and improve system transmission stability

a RIS-assisted UWOC system was proposed. The specific research process was as follows: (1) the cascaded turbulent channel fading coefficients from source to destination were modeled as Gamma-Gamma distributions

and the pointing errors caused by beam jitter and RIS jitter were considered. (2) The UWOC system employed intensity modulation with direct detection

and the transmitting light source could be switched to the optimal one for communication based on feedback from the receiver. (3) The probability density function of the instantaneous received signal-to-noise ratio(SNR) of the RIS-assisted system was derived. Based on the probability density function

a closed-form expression for the interruption probability was provided. (4) Closed-form expressions for the finite SNR diversity order and the asymptotic diversity order at high SNR were derived. (5) Monte Carlo simulations were conducted to verify the correctness of the derived results. Theory analysis and simulation experimects show that the transmission stability of the system can be significantly improved by increasing the number of emitting light sources. Moreover

when the product of the number of transmitting light sources and RIS blocks was constant

the system achieved the same asymptotic diversity order.

关键词

Keywords

references

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