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Photonics
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Visible Light Communications
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Special Issue "Visible Light Communications"

A special issue of Photonics (ISSN 2304-6732).

Deadline for manuscript submissions: 20 September 2023 | Viewed by 3850

Special Issue Editors

Dr. Minglun Zhang

E-Mail Website
Guest Editor
School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China
Interests: visible light communications; underwater optical wireless communications
Dr. Hongyu Zhou

E-Mail Website
Guest Editor
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications (BUPT), Beijing, China
Interests: visible light communications; underwater optical wireless communications

Special Issue Information

Dear Colleagues,

Visible light communication technology was born in 2000. After more than 20 years of development, great progress has been made in light source, modulation technology, detection technology, signal processing technology, and other aspects. The application scenario has expanded from the atmospheric environment to the underwater environment. However, at present, visible light communication technology is far from application. With the evolution of 6G technology, visible light communication technology, as one of the candidate technologies, has attracted significant attention, which is an important opportunity to promote the development of visible light communication technology. Thus, 6G technology poses many challenges to visible light communication technology. What are these challenges and how do we deal with them?

This Special Issue invites manuscripts that introduce the recent advances in “visible light communications for 6G”. All theoretical, numerical, and experimental papers are accepted. Topics include, but are not limited to, the following:

  • Visible light communication challenges in 6G
  • New light sources and detectors;
  • Modulation and demodulation technologies;
  • Pre-emphasis and post-equalization technologies;
  • Nonlinear problems in visible light communication technology;
  • AI in visible light communication technology;
  • Underwater optical wireless communications;
  • Visible light communication networking technology;
  • Li-Fi.

Dr. Minglun Zhang
Dr. Hongyu Zhou
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Photonics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • visible light communications
  • underwater optical wireless communications
  • 6G

Published Papers (4 papers)

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Article
Bandwidth Expansion of Zero-Power-Consumption Visible Light Communication System
by
Yiwu Xu
,
Xiongbin Chen
and
Yufeng Wang
Photonics 2023, 10(4), 376; https://doi.org/10.3390/photonics10040376 - 28 Mar 2023
Viewed by 501
Abstract
The data rate of the zero-power-consumption visible light communication system is limited due to the solar cell bandwidth limit. A new method has been proposed to improve the data rate of communication systems. The predistortion circuit based on the nonlinear compensation principle of [...] Read more.
The data rate of the zero-power-consumption visible light communication system is limited due to the solar cell bandwidth limit. A new method has been proposed to improve the data rate of communication systems. The predistortion circuit based on the nonlinear compensation principle of the communication system is added between the transmitter and the receiver to equalize the amplitude–frequency response of the solar cell. Based on the measurement of the original amplitude–frequency response of the system, the zero-pole of the predistortion circuit is calculated, and an accurate equalization circuit is designed by using separate components to expand the 3 dB bandwidth of the system. The test results show that the 3 dB bandwidth of the visible light self-powered communication system is increased from 85 kHz to 750 kHz, and the system bandwidth is expanded by nearly 10 times. Full article
(This article belongs to the Special Issue Visible Light Communications)
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Article
Sixty-Nine-Element Voice Coil Deformable Mirror for Visible Light Communication
by
Lv Jiang
,
Lifa Hu
,
Qili Hu
,
Xingyu Xu
,
Jingjing Wu
,
Lin Yu
and
Yang Huang
Photonics 2023, 10(3), 322; https://doi.org/10.3390/photonics10030322 - 17 Mar 2023
Viewed by 584
Abstract
To overcome the atmospheric turbulence aberration, and improve the quality of light beam in visible light communication (VLC), a compact 69-element deformable mirror (DM) using micro voice coil actuators was designed based on systematic theoretical analysis. The structural parameters of the micro voice [...] Read more.
To overcome the atmospheric turbulence aberration, and improve the quality of light beam in visible light communication (VLC), a compact 69-element deformable mirror (DM) using micro voice coil actuators was designed based on systematic theoretical analysis. The structural parameters of the micro voice coil actuator were optimized by electromagnetic theory and the finite element method. The DM was optimized from the aspects of thermal deformation, response time, coupling coefficient, and other parameters. Finally, wavefront fitting and residual calculation were completed according to the influence function. The optimized voice coil deformable mirror (VCDM) has a large phase stroke, good thermal stability, a short response time of less than 0.7 ms, and a large first resonance of 2045 Hz. The fitting residuals of the VCDM for the first 10 Zernike modes with a PV value of 8 μm are all below 10 nm (RMS). Compared with a similar DM, the obtained results from our compact VCDM indicate that it has a higher wavefront fitting precision. VCDM corrected complex random aberrations in the VLC scenario and improved the coupling efficiency of the signal beam, proving that the compact VCDM with high performance and low cost has a good application prospect in VLC systems. Full article
(This article belongs to the Special Issue Visible Light Communications)
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Article
Enhanced Performance of a Cascaded Receiver Consisting of a DNN-Based Waveform-to-Symbol Converter and Modified NN-Based DD-LMS in CAP Underwater VLC System
by
Xianhao Lin
,
Fangchen Hu
and
Nan Chi
Photonics 2023, 10(1), 79; https://doi.org/10.3390/photonics10010079 - 10 Jan 2023
Cited by 1 | Viewed by 1299
Abstract
Underwater visible light communication (UVLC) based on LEDs has become a competitive candidate, which is able to provide high data rates, low latency and low cost for next-generation wireless communication technologies. However, it is still challenging to achieve high-speed communication because of bottleneck [...] Read more.
Underwater visible light communication (UVLC) based on LEDs has become a competitive candidate, which is able to provide high data rates, low latency and low cost for next-generation wireless communication technologies. However, it is still challenging to achieve high-speed communication because of bottleneck problems such as bandwidth limitation and linear and nonlinear distortions. Traditional Deep-learning Neural Network (DNN)-based waveform-to-symbol converter is verified to be an effective method to alleviate them, but impractical due to high complexity. To achieve a better tradeoff between communication performance and computation complexity, a cascaded receiver consisting of a DNN-based waveform-to-symbol converter and modified Neural Network (NN)-based decision-directed least mean square (DD-LMS) is then innovatively proposed. With fewer taps and nodes than the traditional converter, the front-stage converter could mitigate the majority of Inter-Symbol Interference (ISI) and signal nonlinear distortions. Then modified NN-based DD-LMS is cascaded to improve communication performance by reducing phase offset, making received constellation points more concentrated and closer to standard constellation points. Compared with the traditional converter, the cascaded receiver could achieve 89.6% of signal Vpp dynamic range with 12.4% of complexity in the 64APSK UVLC system. Moreover, the ratio of signal Vpp dynamic range and total trainable parameters is 1.24 × 10−1 mV, while that of the traditional converter is 1.95 × 10−2 mV. The cascaded receiver used in 64APSK UVLC systems is experimentally verified to achieve enhanced performance, thus as a promising scheme for future high-speed underwater VLC. Full article
(This article belongs to the Special Issue Visible Light Communications)
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Article
Volterra-Aided Neural Network Equalization for Channel Impairment Compensation in Visible Light Communication System
by
Daming Tian
,
Pu Miao
,
Hui Peng
,
Weibang Yin
and
Xiaorui Li
Photonics 2022, 9(11), 845; https://doi.org/10.3390/photonics9110845 - 10 Nov 2022
Cited by 2 | Viewed by 795
Abstract
This paper addresses the channel impairment to enhance the system performance of visible light communication (VLC). Inspired by the model-solving procedure in the conventional equalizer, the channel impairment compensation is formulated as a spatial memory pattern prediction problem, then we propose efficient deep-learning [...] Read more.
This paper addresses the channel impairment to enhance the system performance of visible light communication (VLC). Inspired by the model-solving procedure in the conventional equalizer, the channel impairment compensation is formulated as a spatial memory pattern prediction problem, then we propose efficient deep-learning (DL)-based nonlinear post-equalization, combining the Volterra-aided convolutional neural network (CNN) and long-short term memory (LSTM) neural network, to mitigate the system nonlinearity and then recover the original transmitted signal from the distorted one at the receiver end. The Volterra structure is employed to construct a spatial pattern that can be easily interpreted by the proposed scheme. Then, we take advantage of the CNN to extract the implicit feature of channel impairments and utilize the LSTM to predict the memory sequence. Results demonstrate that the proposed scheme can provide a fairly fast convergence during the training stage and can effectively mitigate the overall nonlinearity of the system at testing. Furthermore, it can recover the original signal accurately and exhibits an excellent bit error rate performance as compared with the conventional equalizer, demonstrating the prospect and validity of this methodology for channel impairment compensation. Full article
(This article belongs to the Special Issue Visible Light Communications)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: A trial combing a mirror array-based RIS with a liquid crystal-based RIS in indoor visible light communications
Authors: Qi Wu; Jian Zhang*; Jia-Ning Guo; Gang Xin; Yan-Yu Zhang
Affiliation: The authors are with National Digital Switching System Engineering and Technological Research Center, Henan Province (450000), China.
Abstract: The research on reconfigurable intelligent surface (RIS)-aided visible light communication (VLC) has been widely investigated in recent years. However, traditional research on this area only concentrates on one type of VLC RIS (such as mirror-based RIS or liquid crystal (LC)-based RIS) while dismissing the combination of different kinds of VLC RISs. Consequently, inconsideration of the huge potential produced by the combination of VLC RIS, this paper proposes a trial combing a mirror array-based RIS with a liquid crystal-based RIS in an indoor visible light communication system. The optimization problem is formulated with asymptotic capacity maximization as the objective function and the parameters of the two types of RIS as the independent variables. As for the non-convex optimization problem, the particle swarm optimization (PSO) algorithm is adopted to determine the optimal configuration of parameters for the two types of RIS. Simulation results indicate that the PSO algorithm is an effective method to solve the proposed optimization problem compared with the exhaustive search method, and meanwhile, the combination of a mirror array-based RIS and a liquid crystal-based RIS is able to enhance the communication performance to a greater degree compared with the RIS-aided VLC system which employ only one type of VLC RIS.

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