Angular MIMO for Underwater Wireless Optical Communications: Link Modeling and Tracking

Ghazy, Abdallah S.; Hranilovic, Steve; Khalighi, Mohammad-Ali

doi:10.1109/joe.2021.3055477

Cited by 22 publications

(10 citation statements)

References 37 publications

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“…State of the art in this area is diversifying into several areas of research. One area focusses on the VLC network's physical layer primarily, implementing modulation techniques on devices such as laser diodes analysing for data-rate [3], bit error rate and energy efficiency gains as well as other related experiments in Multiple Input Multiple Output (MIMO) systems [4] and modelling etc [5]. There have been investigations into designing nodes and other related UWSN hardware [6].…”

Section: Introductionmentioning

confidence: 99%

A simulation into the physical and network layers of optical communication network for the subsea video surveillance of illicit activity

Stewart

Fough²,

Prabhu³

2022

Counterterrorism, Crime Fighting, Forensics, and Surveillance Technologies VI

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Criminal activity is increasingly entering the ocean subsurface with acts such as illegal fishing and narco-submarining becoming points of contention. This among other illicit acts taking place in this domain imply a need for surveillance to render these activities apparent. However, subsurface Underwater Sensor Networking which is central to the surveillance is still generations behind terrestrial networking, therefore it is still challenging to monitor for subsurface activities. This is since the current signal transmission standard, acoustic communication, is limited in practical bandwidth and thus channel data-rate, this is, however, caveated with omni-directional propagation and supreme range rendering it reliable but incapable of carrying video or other data intensive sensor information. There is, however, an emerging technology based on optical (visible light) communication that can accommodate surveillance applications with superior data rates and energy savings. This investigation demonstrates how theoretically it is possible to achieve a network of underwater channels capable of sustaining a multimedia feed for monitoring subsurface activity using modern optical communication when in compared to an acoustic network. In addition, a simple topology was investigated that shows how the range limitations of this signaling can be extended by adding floating relay nodes. Through simulations in Network Simulator 3 (NS-3)/Aquasim-NG software it is shown that Visible Light wireless communication in visible light networks have a channel capacity high enough to carry out monitoring in strategic areas, referencing, optical modems that are available in the market. This implies that data-rates of 10 Mb/s are possible for the real-time video surveillance.

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Section: Introductionmentioning

confidence: 99%

A simulation into the physical and network layers of optical communication network for the subsea video surveillance of illicit activity

Stewart

Fough²,

Prabhu³

2022

Counterterrorism, Crime Fighting, Forensics, and Surveillance Technologies VI

View full text Add to dashboard Cite

show abstract

“…In recent years, underwater wireless optical communication (UWOC) has attracted a lot of attentions due to its high data rate, high security, high bandwidth, low latency, and low cost [1][2][3][4]. UWOC has many applications in the rapidly growing human underwater activities, such as submarines, autonomous underwater vehicles and unmanned underwater vehicles [5,6]. In order to meet the increasing demand for data transmission in military, civilian and commercial, orbital angular momentum (OAM) is introduced into UWOC [7].…”

Section: Introductionmentioning

confidence: 99%

Diffractive deep neural network based adaptive optics scheme for vortex beam in oceanic turbulence

Zhan,

Wang,

Wang

et al. 2022

Preprint

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Vortex beam carrying orbital angular momentum (OAM) is disturbed by oceanic turbulence (OT) when propagating in underwater wireless optical communication (UWOC) system. Adaptive optics (AO) is used to compensate for distortion and improve the performance of the UWOC system. In this work, we propose a diffractive deep neural network (DDNN) based AO scheme to compensate for the distortion caused by OT, where the DDNN is trained to obtain the mapping between the distortion intensity distribution of the vortex beam and its corresponding phase screen representating OT. The intensity pattern of the distorted vortex beam obtained in the experiment is input to the DDNN model, and the predicted phase screen can be used to compensate the distortion in real time. The experiment results show that the proposed scheme can extract quickly the characteristics of the intensity pattern of the distorted vortex beam, and output accurately the predicted phase screen. The mode purity of the compensated vortex beam is significantly improved, even with a strong OT. Our scheme may provide a new avenue for AO techniques, and is expected to promote the communication quality of UWOC system.

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“…Also, [4] and [5] investigated a buoy-based UWOC downlink scenario, of which the latter extended in [6] to the case of employing multiple Txs and Rxs to improve channel capacity. An angular multiple-input multiple-output technique was proposed in [7], to reduce misalignment effect for the case of UWOC links over relatively short ranges. Meanwhile, non-line-of-sight data transmission between underwater units (using reflection from the sea surface) was studied in [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Ergodic Capacity of a Vertical Underwater Wireless Optical Communication Link Subject to Misalignment

Ijeh

Haddad

Khalighi

2022

2022 4th West Asian Symposium on Optical and Millimeter-Wave Wireless Communications (WASOWC)

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Typical underwater communication scenarios include data transfer between a surface platform and an underwater unit. We consider the use of underwater wireless optical communications (UWOC) for such scenarios, where the link performance is affected by transmitter-receiver misalignment in practice. The focus is on the channel ergodic capacity based on an elaborate statistical model of the aquatic channel accounting for different phenomena such as surface wind speed, beam directivity, underwater unit beam misalignment, and solar noise, as well as the transmitter/receiver parameters. The presented results demonstrate the channel effects and provide interesting insight into the design of such links.

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Angular MIMO for Underwater Wireless Optical Communications: Link Modeling and Tracking

Cited by 22 publications

References 37 publications

A simulation into the physical and network layers of optical communication network for the subsea video surveillance of illicit activity

A simulation into the physical and network layers of optical communication network for the subsea video surveillance of illicit activity

Diffractive deep neural network based adaptive optics scheme for vortex beam in oceanic turbulence

Ergodic Capacity of a Vertical Underwater Wireless Optical Communication Link Subject to Misalignment

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