Experimental Study of Light Wave Propagation for Underwater Optical Wireless Communication (UOWC)

Hassan, Wan Hafiza Wan; Sabril, Muhammad Safiy; Jasman, Faezah; Idrus, Sevia Mahdaliza

doi:10.12720/jcm.17.1.23-29

Cited by 13 publications

(4 citation statements)

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“…The following Algorithm 2 is designed to solve Equation (21) [ 39 ]. Algorithm 2 Input :

Output:

1: Set initial interval

2: Set

, obtained by

3: while

do 4: Set

, bring the value of

into Equation (22) to obtain the power distribution coefficient

…”

Section: Optimization Of Power Distribution Algorithmmentioning

confidence: 99%

Research on Power Allocation in Multiple-Beam Space Division Access Based on NOMA for Underwater Optical Communication

Mohsan

Chen

et al. 2023

Sensors

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To meet the transmission requirements of different users in a multiple-beam access system for underwater optical communication (UWOC), this paper proposes a novel multiple-beam space division multiple access (MB-SDMA) system by utilizing a directional radiation communication beam of the hemispherical LED arrays. The system’s access users in the different beams are divided into two categories: the users with a single beam and the users with multiple beams. We also propose a power allocation algorithm that guarantees the quality of service (QoS) for single beam and multiple beam access, especially the QoS for edge users, and fairness for all users. An optimization model of power distribution under the constraints of specific light-emitting diode (LED) emission power is established for two scenarios, which ensure the user QoS for edge users and the max–min fairness for fair users. Using the Karush–Kuhn–Tucker (KKT) condition and the bisection method, we obtain the optimal power allocation expression for the two types of users in the optimization model. Through simulation, we verify that the proposed user classification and power allocation method can ensure the fairness of fair users on the premise of ensuring the QoS of edge users. At the same time, we know that the number of users will affect the improvement of the minimum rate, and the throughput of the non-orthogonal multiple access (NOMA) system is greatly improved compared with the traditional orthogonal multiple access (OMA) systems.

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“…The following Algorithm 2 is designed to solve Equation (21) [ 39 ]. Algorithm 2 Input :

Output:

1: Set initial interval

2: Set

, obtained by

3: while

do 4: Set

, bring the value of

into Equation (22) to obtain the power distribution coefficient

…”

Section: Optimization Of Power Distribution Algorithmmentioning

confidence: 99%

Research on Power Allocation in Multiple-Beam Space Division Access Based on NOMA for Underwater Optical Communication

Mohsan

Chen

et al. 2023

Sensors

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show abstract

“…Underwater wireless optical communication (UWOC) plays a crucial role in various domains, including underwater sensing, communication, and cross-medium signal transmission between land and underwater environments. [1][2][3] In UWOC, transmitting signals using light within specific wavelength bands is essential to facilitate information exchange between underwater and terrestrial locations. Typically, blue-green light (450-550 nm) experiences minimal attenuation in water, making it widely applicable for underwater illumination, and wireless data transmission.…”

Section: Introductionmentioning

confidence: 99%

Stable and self-healing perovskite for high-speed underwater optical wireless communication

Xu,

Fu,

Shi

et al. 2024

J. Mater. Chem. C

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“…Acoustic systems have enjoyed great success underwater owing to their ability to communicate over many kilometers, which has promoted research in this field, thus improving this technology. Numerous studies have been conducted to enhance the performance of acoustic communication channels [3][4][5][6][7]. Nonetheless, its performance is related to its physical nature, which limits the bandwidth, results in high potential, and produces high transmission losses, time-varying multi-path propagation, and Doppler spread [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A 930 m/180 Gbps*User Underwater Coherent Optical Code-Division Multiple-Access Network Based on Hybrid 256-Differential Pulse Position Modulation and Weighted Modified Prime Code Sequence

Ismail,

Saleh

2024

Photonics

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Currently, there are three types of optical communication networks based on the communication channel between the transmitter and receiver: the optical fiber channel, visible light channel, and optical wireless channel networks. The last type has several advantages for underwater communication, wireless sensors, and military communication networks. However, this type of optical network suffers from weather conditions in free-space communications and attenuation owing to the scattering and absorption mechanisms for underwater communication. In this study, we present a new transceiver architecture of a coherent optical code-division multiple-access (OCDMA) system based on a hybrid M-ary differential pulse position modulation scheme and a spreading code sequence called weighted modified prime code for underwater communication to minimize channel dispersion, increase the transmission rate per second, enhance the network bit error rate (BER) performance, and improve network security. Using an OCDMA system, we can simultaneously expand the network coverage area and increase the number of users sharing the network over the same channel bandwidth. The simulation results in this study proved that the proposed system can accommodate 1310 active users and a network throughput of 180 Gbps*user over a transmission distance of 930 m without any repeater at a 10−9 BER performance, compared to the 45 Gbps*user network throughput and 100 m transmission distance reported in the literature.

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Experimental Study of Light Wave Propagation for Underwater Optical Wireless Communication (UOWC)

Cited by 13 publications

References 0 publications

Research on Power Allocation in Multiple-Beam Space Division Access Based on NOMA for Underwater Optical Communication

Research on Power Allocation in Multiple-Beam Space Division Access Based on NOMA for Underwater Optical Communication

Stable and self-healing perovskite for high-speed underwater optical wireless communication

A 930 m/180 Gbps*User Underwater Coherent Optical Code-Division Multiple-Access Network Based on Hybrid 256-Differential Pulse Position Modulation and Weighted Modified Prime Code Sequence

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