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Photonics
Special Issues
Advanced Technologies in Optical Wireless Communications
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Advanced Technologies in Optical Wireless Communications

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "Optical Communication and Network".

Deadline for manuscript submissions: 1 May 2024 | Viewed by 3010

Special Issue Editors

Dr. Cuiwei He

E-Mail Website
Guest Editor
School of Information Science, Japan Advanced Institute of Science and Technology (JAIST), 1 Chome-1 Asahidai, Nomi, Ishikawa 923-1211, Japan
Interests: optical wireless communications; visible light communications; visible light positioning; modulation/demodulation techniques; digital signal processing; photon-counting receiver; machine learning; fluorescent antenna
Special Issues, Collections and Topics in MDPI journals
Dr. Chen Chen

E-Mail Website
Guest Editor
School of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, China
Interests: visible light communication and positioning; advanced modulation; multiple access and multiplexing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Optical wireless communication (OWC) is an innovative technology that combines the advantages of optical fiber and radio frequency (RF) communication, enabling high-speed broadband mobile transmission without the requirement for licensing the used optical frequency band. Additionally, OWC exhibits resistance to electromagnetic interference, providing robust confidentiality. As a result, there is a significant increase in interest in developing OWC technologies for a range of wireless applications, notably indoor LiFi and underwater OWC.

To boost the transmission data rate and/or enhance the reliability of different OWC systems, researchers are exploring various techniques. For example, there is a growing trend in recent research towards employing data-driven machine learning techniques in various OWC scenarios to enhance transmission performance. Moreover, many research groups are actively developing advanced transceiver devices, such as micro LEDs, VCSELs and photodetectors, specifically designed for OWC. These devices can support extremely high transmission bandwidth and, therefore, very high transmission data rates. Furthermore, there is a growing interest in novel interdisciplinary research that explores the application of advanced optical materials in OWC to enhance transmission performance. With the ongoing development of crucial techniques, we eagerly anticipate OWC playing a significant role in the future 6G network.

This Special Issue aims to publish high-quality papers that study emerging important technologies in OWC. Research areas may include (but are not limited to) the following topics:

  • Transmitter/receiver technologies for OWC;
  • Advanced signal processing in OWC;
  • Optical MIMO and spatial modulation;
  • High-quality OWC experiments;
  • Advanced optical materials in OWC;
  • Photon counting receivers in OWC;
  • Machine learning and neural networks in OWC;
  • Indoor localization and positioning;
  • Underwater optical wireless systems;
  • Vehicle-to-vehicle OWC.

Dr. Cuiwei He
Dr. Chen Chen
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 2400 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

  • optical wireless communications
  • visible light communication
  • indoor localization and positioning
  • LiFi
  • modulation/demodulation
  • machine learning
  • photon counting

Published Papers (3 papers)

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Research

14 pages, 1987 KiB  
Article
Design of the Light Source Layout Optimization Strategy Based on Region Partition and Pre-Bias Compensation for Indoor Visible Light Communication Systems
by Qiong Zhao, Weilin Zhang, Jiacheng Fan and Lijun Deng
Photonics 2023, 10(12), 1344; https://doi.org/10.3390/photonics10121344 - 06 Dec 2023
Viewed by 890
Abstract
Optimization of the light source layout is an important issue for indoor visible light communication systems, as it affects the received optical power distribution and user perception. In this paper, we propose a local optimization strategy for the light source layout that balances [...] Read more.
Optimization of the light source layout is an important issue for indoor visible light communication systems, as it affects the received optical power distribution and user perception. In this paper, we propose a local optimization strategy for the light source layout that balances optimization effectiveness with optimization efficiency. First, we divide the optimization region into multiple sub-regions with different sizes and optimization priorities, where the sizes and optimization priorities of the individual sub-regions are determined based on the effect minimization principle among the sub-regions. We then calculate the pre-bias factor based on the equivalent mapping, which can compensate for the effect of the light sources in the latter optimized sub-region on the source layout optimization in the current sub-region. Finally, we search for the coordinate of a single light source for each sub-region using the variance of the squared distance between the projection of the light source on the receiving plane and the received point as a fitness function. Simulation results show that the proposed optimization strategy performs well when the vertical distance between the ceiling and the receiving plane is not less than 2.85 m. Full article
(This article belongs to the Special Issue Advanced Technologies in Optical Wireless Communications)
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15 pages, 416 KiB  
Article
Tolerance-Aided Interference Degradation for Optical OFDM in Power-Constrained Systems
by Yan Gao and Jie Lian
Photonics 2023, 10(11), 1206; https://doi.org/10.3390/photonics10111206 - 29 Oct 2023
Viewed by 660
Abstract
Optical wireless communications (OWCs) are power-efficient for providing short-range and high-speed data transmission. In this paper, we propose an interference degradation algorithm for power-constrained OWC systems when using orthogonal frequency division multiplexing (OFDM). In this algorithm, we introduce a decision tolerance at the [...] Read more.
Optical wireless communications (OWCs) are power-efficient for providing short-range and high-speed data transmission. In this paper, we propose an interference degradation algorithm for power-constrained OWC systems when using orthogonal frequency division multiplexing (OFDM). In this algorithm, we introduce a decision tolerance at the receiver that can be optimally designed to reduce interference caused by peak power clipping distortion and decrease additive noise collected by the photodetectors. Although the recently proposed clipping-enhanced optical OFDM (CEO-OFDM) can transmit clipped information through extra signal frames, reconstructing the received signal introduces more noise. Using the proposed decision tolerance, we can determine whether the signals in the extra frame are required for data reconstruction. By optimally choosing the decision tolerance, the bit error rate (BER) performance is enhanced compared to those of DCO, ACO, and CEO-OFDM. Additionally, the proposed algorithm offers a wider dynamic modulation index range than DCO, ACO, and CEO-OFDM at the same BER. Using the tested parameters, the proposed algorithm with 64-QAM achieves a similar best BER performance as DCO, ACO, and CEO-OFDM using 32-QAM. Therefore, the proposed algorithm achieves a higher data rate than those of the other compared techniques. Full article
(This article belongs to the Special Issue Advanced Technologies in Optical Wireless Communications)
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13 pages, 3531 KiB  
Article
Performance Analysis of Soft-Switching FSO/THz-RF Dual-Hop AF-NOMA Link Based on Cognitive Radio
by Rongpeng Liu, Ziyang Wang, Xuerui Wang, Jingwei Lu, Yawei Wang, Yizhou Zhuo, Ruihuan Wu, Zhongchao Wei and Hongzhan Liu
Photonics 2023, 10(10), 1086; https://doi.org/10.3390/photonics10101086 - 27 Sep 2023
Viewed by 795
Abstract
This paper presents a promising solution to address the scarcity of spectrum resources and enhance spectrum efficiency in the context of cognitive radio (CR)-based soft-switching free-space optical (FSO)/terahertz (THz) radio frequency (RF) dual-hop amplify-and-forward (AF)–non-orthogonal multiple access (ROMANO) links. The impact of maximum [...] Read more.
This paper presents a promising solution to address the scarcity of spectrum resources and enhance spectrum efficiency in the context of cognitive radio (CR)-based soft-switching free-space optical (FSO)/terahertz (THz) radio frequency (RF) dual-hop amplify-and-forward (AF)–non-orthogonal multiple access (ROMANO) links. The impact of maximum tolerable interference power in the primary network, transmit power in the secondary transmitter, and maximum relay transmission power on the link are thoroughly studied. The numerical results ultimately validate the effectiveness of this link in improving performance, and a comparative analysis is conducted with the without-CR scheme, highlighting the distinctive characteristics of the proposed link. Full article
(This article belongs to the Special Issue Advanced Technologies in Optical Wireless Communications)
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