An experimental study of NOMA in underwater visible light communication system

Chen, Danyang; Wang, Yue; Jin, Jianli; Lu, Huimin; Wang, Jianping

doi:10.1016/j.optcom.2020.126199

Cited by 22 publications

(12 citation statements)

References 21 publications

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“…The results demonstrate that the proposed NOMA system works better in underwater environment than in air environment. The total transmission rate in underwater environment achieves 117.4 Mb/s when employing red/blue LEDs in the proposed system, and 93.9 Mb/s when employing red/green LEDs in the proposed system, with a transmission distance of 1 m. (Chen, 2020) Since the two branches of the DBMLP can compensate linear and nonlinear distortion in the received signal, respectively, the complexity of the neural network is reduced and the performance of the post-equalizer is improved. Compared with multi-layer perceptron (MLP) based PE the space complexity of DBMLP based PE reduces 59.5%, and the bit error rate (BER) at 3.1 Gbps reduces 45.5%.…”

Section: Introductionmentioning

confidence: 95%

Bi-Directional Data Communication using Visible Light Technology for Underwater Environment

et al. 2021

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Pengembangan VLC (Visible Light Communication) dapat diimplementasikan ke dalam air. Pada penelitian ini dirancang sistem komunikasi menggunakan cahaya tampak untuk komunikasi dua arah di lingkungan bawah air. Sistem dirancang untuk mengirimkan sinyal digital dengan pengukuran jarak menggunakan filter warna. Terdapat dua link di bagian pemancar dan penerima. Untuk membedakan kedua link tersebut, data dari generator sinyal 3 kHz akan diaplikasikan pada link 1 dan data dari pembangkit sinyal 4 kHz akan diaplikasikan pada link 2. Berdasarkan hasil pengujian, sistem menerima data secara optimal pada link 1 dengan jarak 50 cm dengan tegangan keluaran (Vout) 4,32 Vpp, dan frekuensi keluaran (fout) 3,121 kHz. Hasil pengukuran pada link 2 didapatkan tegangan keluaran sebesar 5,28 Vpp dan frekuensi keluaran (fout) sebesar 4,021 kHz. Pengukuran pada link 1 dengan filter warna biru didapatkan tegangan rata-rata sebesar 5,46 Vpp dan frekuensi keluaran (fout)) sebesar 3,136 kHz. Sedangkan pengukuran link 2 dengan filter warna merah didapatkan tegangan rata-rata 5,11 Vpp dan fout 4,054 kHz.

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Section: Introductionmentioning

confidence: 95%

Bi-Directional Data Communication using Visible Light Technology for Underwater Environment

et al. 2021

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“…The SIMU mobility algorithm, is the algorithm where the source diver communicates with 5 moving divers and each encompasses a detector in order that the power is shared between five divers rather than one diver as described in [5,23]. The distance between the source and receiving divers is set to 23 m and 50 m, where each diver carrying a receiver is 1.5 m apart.…”

Section: B Single Input Multiple Users (Simu) Model Mobility Algorithmmentioning

confidence: 99%

“…In addition, the source array is set to be 10×10 and 16×16 LED chips array, the power of each LED chip is 2 W and the number of rays per LED chip in the Zemax Optics Studio simulator is 500,000 rays [4]. Moreover, the depth of the transmitting and receiving divers is 25 m [4,5].…”

Section: B Single Input Multiple Users (Simu) Model Mobility Algorithmmentioning

confidence: 99%

“…The optical links power consumption is in range of milliwatts to few watts, depending on the transmitter type; either laser diodes (LDs) or light emitting diodes (LEDs) and supports high data rates up to Gbps [3]. Moreover, UVLC systems suffer from severe absorption and scattering effects introduced by the underwater channel that needs to be addressed well to mitigate this effect and increases the average link distance which is just a few tens of meters [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Statistical Studies Using Goodness-of-Fit Techniques With Dynamic Underwater Visible Light Communication Channel Modeling

et al. 2021

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In this paper, we studied the probability distribution function (PDF) of the channel gain of dynamic underwater visible light communication (UVLC) model for different types of water using goodnessof-fit (GoF). We used different water channels at different system parameters with dynamic scenarios. First, the Zemax Optics Studio simulator is used to simulate dynamic UVLC channels. UVLC links are examined using Monte Carlo Ray-Tracing (MCRT) simulation for three different water channels; namely, pure sea water channel, clear ocean water channel and coastal ocean water channel at different configuration types. With the presence of blocking divers, we added a dynamic movement in a single input multiple users (SIMU) scenario. Our simulation is based on Zemax Programming Language (ZPL) in sequence with the Zemax Optics Studio. The GoF tests are used to get the degree of fitness between the simulation data and the set of well-known candidate distributions to determine the best fit. We used the R statistical programming language and applied predefined algorithms to determine the optimum degree of fitting for each statistical result. The Kolmogorov-Smirnov (KS), Chi-Square (CS), Cramer-Von-Mises (CVM) and Anderson-Darling (AD) tests are used to represent the four GoF statistical computation techniques for each channel scenario. The received power is enhanced by 35% when the detector movement area increases from 25 m 2 to 100 m 2 in clear ocean water channel. The obtained results reveal that the UVLC is best represented by Weibull, Gamma or Lognormal distributions.

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“…A NOMA aided UOWC system with a photon counting receiver has been presented in [18]. In [19], power domain NOMA is introduced for UOWC to improve the spectrum efficiency and sum rate. Further, two LEDs with different colors have been used to improve the efficiency of communication.…”

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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An experimental study of NOMA in underwater visible light communication system

Cited by 22 publications

References 21 publications

Bi-Directional Data Communication using Visible Light Technology for Underwater Environment

Bi-Directional Data Communication using Visible Light Technology for Underwater Environment

Statistical Studies Using Goodness-of-Fit Techniques With Dynamic Underwater Visible Light Communication Channel Modeling

Average Rate Analysis of Cooperative NOMA Aided Underwater Optical Wireless Systems

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