在 WGG 海洋湍流中,AUV 搭载的 RIS 辅助多跳 UWOC 与 RF MRC 系统融合的性能分析

IF 5.8 2区 计算机科学 Q1 TELECOMMUNICATIONS
Binna Zhou, Ping Wang, Tian Cao, Ganggang Li, Shuang Li, Pengfei Yang
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引用次数: 0

摘要

为了在水下物联网(IoUT)设备与地面数据中心之间建立可靠的连接,本研究首先提出了一种可重构智能表面(RIS)辅助多跳水下无线光通信(UWOC)与射频(RF)上行链路融合系统。具体来说,在 UWOC 链路中引入自主水下航行器(AUV)携带的 RIS,以放宽视线(LOS)要求,并在地面数据中心采用最大比率组合(MRC)接收器来减轻射频链路衰减。假设水下温跃层信道服从新提出的魏布勒-广义伽马(WGG)湍流分布,射频链路复合衰落服从 Fisher-Snedecor F 分布。此外,光链路错位采用零视距指向误差模型。利用解码-前向(DF)中继方案,用数学方法得到了该系统的中断概率(OP)和平均误码率(ABER)的解析闭式表达式,然后进一步研究了气泡、热卤梯度、RIS 元素数量、指向误差、系统结构和接收天线数量的影响。同时,蒙特卡罗(MC)模拟验证了分析结果。结果表明,这种混合系统的性能会随着气泡水平和温盐梯度的增加而降低。值得注意的是,RIS 可以有效缓解水下湍流的影响,而且随着 RIS 元件数量的增加,这种效果会更加明显。这项工作将有助于 UWOC-RF 混合系统的设计和研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Performance analysis of AUV-carried RISs-aided multihop UWOC convergent with RF MRC systems over WGG oceanic turbulence

To establish reliable connection between Internet of Underwater Things (IoUT) devices and terrestrial data centers, this work first proposes a reconfigurable intelligent surface (RIS) aided multihop underwater wireless optical communication (UWOC) convergent with radio frequency (RF) uplink system. Specifically, the RIS carried by an autonomous underwater vehicle (AUV) is introduced into UWOC link to relax the line-of-sight (LOS) requirement and the maximal-ratio combining (MRC) receiver is adopted at the terrestrial data center to mitigate the RF link fading. It is assumed that the underwater thermocline channel is subject to the newly proposed Weibull-generalized gamma (WGG) turbulence distribution and the RF link composite fading follows Fisher-Snedecor F distribution. Additionally, the optical link misalignment is characterized by the zero-boresight pointing errors model. With the decode-and-forward (DF) relaying scheme, the analytical closed-form expressions of the outage probability (OP) and average bit error rate (ABER) of this system are mathematically achieved, and then the impacts of air bubbles, thermohaline gradient, the number of RIS elements, pointing errors, system structure, and the number of receive antennas are further investigated. Meanwhile, the analytical results are verified by Monte Carlo (MC) simulations. Results reveal that this hybrid system performance would degrade with the increased air bubble levels and thermohaline gradients. Notably, RIS can effectively alleviate the impact of underwater turbulence and this effect would be more pronounced as the number of RIS elements increases. This work will benefit the design and research of hybrid UWOC-RF system.

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来源期刊
Vehicular Communications
Vehicular Communications Engineering-Electrical and Electronic Engineering
CiteScore
12.70
自引率
10.40%
发文量
88
审稿时长
62 days
期刊介绍: Vehicular communications is a growing area of communications between vehicles and including roadside communication infrastructure. Advances in wireless communications are making possible sharing of information through real time communications between vehicles and infrastructure. This has led to applications to increase safety of vehicles and communication between passengers and the Internet. Standardization efforts on vehicular communication are also underway to make vehicular transportation safer, greener and easier. The aim of the journal is to publish high quality peer–reviewed papers in the area of vehicular communications. The scope encompasses all types of communications involving vehicles, including vehicle–to–vehicle and vehicle–to–infrastructure. The scope includes (but not limited to) the following topics related to vehicular communications: Vehicle to vehicle and vehicle to infrastructure communications Channel modelling, modulating and coding Congestion Control and scalability issues Protocol design, testing and verification Routing in vehicular networks Security issues and countermeasures Deployment and field testing Reducing energy consumption and enhancing safety of vehicles Wireless in–car networks Data collection and dissemination methods Mobility and handover issues Safety and driver assistance applications UAV Underwater communications Autonomous cooperative driving Social networks Internet of vehicles Standardization of protocols.
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