Recent Advances and Future Directions on Underwater Wireless Communications

Ali, Mohammad Furqan; Jayakody, Dushantha Nalin K.; Chursin, Yury A.; Affes, Soféine; Sonkin, Dmitry Mikhailovich

doi:10.1007/s11831-019-09354-8

Cited by 181 publications

(91 citation statements)

References 93 publications

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“…Currently the use of wireless communications is very common in a wide range of terrestrial devices. In the underwater world, the application of wireless communications is of great interest to the military, industry, and the scientific community [1,2]. Acoustic systems have enjoyed great success under water owing to their ability to communicate over many kilometers pushing the research in this field with the aim to further improve this technology.…”

Section: Introductionmentioning

confidence: 99%

Underwater Optical Wireless Communications: Overview

Spagnolo

Cozzella

Leccese

2020

Sensors

236

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Underwater Optical Wireless Communication (UOWC) is not a new idea, but it has recently attracted renewed interest since seawater presents a reduced absorption window for blue-green light. Due to its higher bandwidth, underwater optical wireless communications can support higher data rates at low latency levels compared to acoustic and RF counterparts. The paper is aimed at those who want to undertake studies on UOWC. It offers an overview on the current technologies and those potentially available soon. Particular attention has been given to offering a recent bibliography, especially on the use of single-photon receivers.

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Section: Introductionmentioning

confidence: 99%

Underwater Optical Wireless Communications: Overview

Spagnolo

Cozzella

Leccese

2020

Sensors

236

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“…The requirement of high-speed wireless communications in the marine environment has led to the development of optical internet of underwater things (O-IoUT) [1,2]. The O-IoUT uses optical waves as carriers for data transmission in marine environments to enable a large number of applications that include maritime archeology, tracking of marine species, communication between off-shore ships with underwater divers and submarines for navigation, search and rescue purpose [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Link Misalignment in the Optical-Internet of Underwater Things

et al. 2020

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Underwater wireless optical communication (UWOC) enables high-speed links in water for the optical Internet of Underwater Things (O-IoUT) networks. O-IoUT provides various marine applications, including ocean exploration, environmental monitoring, and underwater navigation. O-IoUT typically utilizes light-emitting diodes (LEDs) and different laser diodes (LDs) such as green/blue lasers to achieve efficient data communication in the underwater environment.The high-speed optical communication is limited up to a few tens of meters due to underwater channel impairments and misalignment between the transmitter (Tx) and the receiver (Rx). UWOC provides high-speed communications only in the line of sight conditions, and a small misalignment between the Tx and the Rx can degrade the system performance. In an attempt to understand and minimize this misalignment issue, we investigate how received power in a UWOC system depends on the transmitted beam's divergence angle. Simulation results are provided to show the effectiveness of the study by comparing the plane, Gaussian, and spherical beams. Monte Carlo simulations are utilized to determine the maximum allowable lateral offset between Tx and Rx for a given Tx divergence angle. The results provide an overview and design-based trade-off between different parameters such as lateral offset, the power received, and bandwidth of the channel. The proposed method improves not only the maximum allowed link-span but also the bandwidth of the channel for a given transmission distance.

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“…The general system architecture of UWSNs is shown in Figure 1 . With the knowledge of some internode distances (ranges), the targets’ position would be determined, and thus a considerable body of research has been investigated in the literature regarding localization in UWSNs [ 4 , 6 , 7 , 8 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

“…Regarding the range-based scheme, the RSS-based method has been drawn much attention in the studies due to cost-effectiveness and synchronization-free, compared with TOA, AOA, and TDOA [ 26 ]. However, unlike terrestrial wireless sensor networks (WSNs), it is quite challenging to utilize the RSS-based method to locate the target in UWSNs because the acoustic signal may suffer the absorption loss in the underwater environment besides the path loss [ 15 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

“…While considerable efforts have been devoted to improving the localization accuracy in terms of the RSS-based scheme, the general effectiveness of these techniques has remained elusive in practice. Most existing works were investigated at a relatively low transmission frequency, for instance, 10 kHz to 100 kHz in [ 11 , 13 , 24 ], which, in other words, means a relatively low transmission data rate [ 26 ]. If one would like to have a higher transmission data rate, it must level up the transmission frequency.…”

Section: Introductionmentioning

confidence: 99%

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An Absorption Mitigation Technique for Received Signal Strength-Based Target Localization in Underwater Wireless Sensor Networks

Mei

Saeed

et al. 2020

Sensors

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Localization is an indispensable technology for underwater wireless sensor networks (UWSNs). In what concerns UWSNs, the accurate location information is not only the requirement of the marine field applications but also the basis of the other corresponding research, for instance, network routing and topology control. Recently, an astonishing surge of interest has been drawn in the received signal strength (RSS)-based scheme due to cost-effectiveness and synchronization-free compared with others. However, unlike the terrestrial wireless sensor networks (WSNs), the acoustic signal may suffer the absorption loss in the underwater environment besides the path loss, which degrades the localization accuracy and limits the capability of the RSS-based technology in UWSNs. In this context, a robust localization method with an absorption mitigation technique (AMT) is developed. First, an RSS-based analytically tractable measurement model is conducted, where the maximum likelihood estimator (MLE) is derived. Nevertheless, it is quite challenging to solve the problem using MLE under a non-convex expression. Therefore, by exploiting certain approximations, the considered localization problem is converted into an optimization expression with a maximum absorption loss involved. A min–max strategy is then presented, with which the problem is turned to minimize the worst situation of the absorption loss. After a simple manipulation, the problem is further investigated as a generalized trust region sub-problem (GTRS) framework. Although the GTRS is a non-convex scheme, the solution can be obtained through an iteration method by introducing a multiplier. In addition, the closed-form expression of the Cramer–Rao lower bound (CRLB) of the analytically tractable measurement model is derived. Numerical simulations demonstrate the effectiveness of the proposed method compared with the state-of-the-art approaches in different scenarios.

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Recent Advances and Future Directions on Underwater Wireless Communications

Cited by 181 publications

References 93 publications

Underwater Optical Wireless Communications: Overview

Underwater Optical Wireless Communications: Overview

Effect of Link Misalignment in the Optical-Internet of Underwater Things

An Absorption Mitigation Technique for Received Signal Strength-Based Target Localization in Underwater Wireless Sensor Networks

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