Transmit Laser Selection for Underwater Visible Light Communication Systems

Elamassie, Mohammed; Al-Nahhal, Mohamed; Kızılırmak, Refik Çağlar; Uysal, Murat

doi:10.1109/pimrc.2019.8904100

Cited by 15 publications

(7 citation statements)

References 20 publications

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“…Therefore, turbulence phenomena affect the performance of optical signal propagation in an aqueous medium. The affecting performance and channel modeling of highly turbid water mediums are presented in existing literature [101], [103], [182]- [184]. The fluctuation in the refractive index directly related to the nature of the water channel as a function of temperature, salinity, pressure, and density.…”

Section: Uvlc Channel Modellingmentioning

confidence: 99%

Recent Trends in Underwater Visible Light Communication (UVLC) Systems

2022

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In recent years, underwater visible light communication (UVLC) has become a potential wireless candidate for signal transmission in highly critical, unknown, and acrimonious water mediums such as oceans. Unfortunately, the oceans are the least explored reservoirs in oceano-geographical history. However, natural disasters have aroused significant interest in observation and monitoring oceanic environments for the last couple of decades. Therefore, UVLC has drawn attention as a reliable digital carrier and claims a futuristic optical media in the wireless communication domain. Counterparts of traditional communications, the green, clean and safe UVLC supports high capacity of data-rate and bandwidth with minimal delay. Nevertheless, over long ranges, the deployment of UVLC is challenging rather than terrestrial basis communication. Additionally, VLC systems suffer from signal attenuation and strong turbulence channel conditions. Due to the fact that, this study provides an exhaustive and comprehensive survey of recent advancements in UVLC implementations to cope with the optical signal propagation issues. In this regard, a wide detail summary and future perspectives of underwater optical signaling towards 5G networks along with the current project schemes, channel impairments, various optical signal modulation techniques, underwater sensor network architectures with energy harvesting approaches, hybrid communication possibilities, and the Internet of underwater things (IoUTs) are concluded in this research.

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Section: Uvlc Channel Modellingmentioning

confidence: 99%

Recent Trends in Underwater Visible Light Communication (UVLC) Systems

2022

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“…Spatial diversity and cooperative relaying are widely used techniques to combat fading in wireless communication systems and enhance the performance. Recently, these techniques have been investigated in the context of UWVLC systems [19,[25][26][27][28][29][30][31]. In [25][26][27][28], the performance of the UWVLC system is analyzed for a weak turbulence scenario, in which the fading is modeled using the log-normal probability density function (PDF).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, these techniques have been investigated in the context of UWVLC systems [19,[25][26][27][28][29][30][31]. In [25][26][27][28], the performance of the UWVLC system is analyzed for a weak turbulence scenario, in which the fading is modeled using the log-normal probability density function (PDF). The authors in [30] explored diversity for a vertical UWVLC link and derived the bit error rate expression by incorporating pointing errors.…”

Section: Introductionmentioning

confidence: 99%

On Performance Analysis of Cooperative Horizontal and Vertical Underwater VLC Systems with Best Relay Selection

et al. 2023

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In this paper, we consider cooperative horizontal and vertical underwater visible light communication (UWVLC) systems employing best relay selection. In the vertical UWVLC system, the source is placed at the sea surface and the destination is placed at a depth of 60 m. The link between the source and the destination is modeled as concatenated layers considering inhomogeneous environmental conditions. The underwater parameters change with depth, causing a variable refractive index, which leads to non-uniform optical turbulence. The horizontal communication link is analyzed for two different levels of turbulence at 10 m and 50 m depths. Turbulence is modeled using a log-normal distribution, whose statistical parameters depend on the temperature and salinity at different depths. We have also taken into account the path losses caused by absorption and scattering, and carried out a comprehensive performance comparison between the horizontal and the vertical UWVLC systems. Insights show that compared to horizontal links, vertical links need an extra relay in order to achieve the same level of matching performance. Moreover, it is shown that the horizontal system’s outage performance improves with depth.

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“…In [29], a sub-optimal LED selection algorithm for distributed multiple-input multipleoutput OWC system is presented. In [30], a transmit laser selection for a diver-to-diver UOWC link where the transmitter has multiple laser sources and the receiver has a one PD has been proposed. However in the existing body of literature, there are no papers that have investigated the LED/PD selec-tion schemes for cooperative NOMA aided UOWC systems.…”

Section: Introductionmentioning

confidence: 99%

Average Rate Analysis of Cooperative NOMA Aided Underwater Optical Wireless Systems

Palitharathna

Suraweera

Godaliyadda

et al. 2021

IEEE Open J. Commun. Soc.

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In this paper, we consider a cooperative non-orthogonal multiple access (NOMA) aided underwater optical wireless system in which the source transmits to two users where the near user serves as a relay node to the far user. Our proposed system consists of multiple narrow-angle light-emitting diode (LED)/photodiode (PD) elements at the source, near user, and far user. In order to achieve communication, our system selects a single LED/PD at each node. We propose several low complexity LED/PD selection schemes that aim to maximize the link throughput and in addition consider optimal and random LED/PD selection for benchmarking. In order to characterize the performance of each scheme, bounds and closed-form tight approximations on the average achievable sum rates are presented. The use of multi element nodes and NOMA increase the average sum rate significantly over conventional orthogonal access. Moreover, near-optimal throughput can be achieved using channel gain based and line-of-sight based LED/PD selection schemes in the medium-to-high transmit power regimes. The derived expressions are also useful to investigate the impact of key system and channel parameters such as the source transmit power, power allocation factor, node placement, and the number of elements at each node.

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Transmit Laser Selection for Underwater Visible Light Communication Systems

Cited by 15 publications

References 20 publications

Recent Trends in Underwater Visible Light Communication (UVLC) Systems

Recent Trends in Underwater Visible Light Communication (UVLC) Systems

On Performance Analysis of Cooperative Horizontal and Vertical Underwater VLC Systems with Best Relay Selection

Average Rate Analysis of Cooperative NOMA Aided Underwater Optical Wireless Systems

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