New Advances in Optical Wireless Communication

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

Deadline for manuscript submissions: 20 June 2024 | Viewed by 4037

Special Issue Editor


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Guest Editor
School of Information Science and Technology, Fudan University, Shanghai, China
Interests: optical wireless communication; photon-counting detection; signal processing

Special Issue Information

Dear Colleagues,

Optical wireless communication (OWC) is a crucial research emphasis in the development of next-generation data acquisition and transmission, offering significant applications in either free space or underwater scenarios. However, current OWC systems encounter many challenges from both technical and engineering perspectives. These challenges are exacerbated by the rapid growth of terminal devices and data traffic, the higher requirements for transmission security, the increased density and diversity of link obstructions, etc. Moreover, the popular satellite-to-ground OWC must consider the issues of turbulence, misalignment and beam wander. Therefore, novel advances in OWC are urgently needed.

This Special Issue invites authors working in relevant fields to submit manuscripts that introduce the recent advances in “optical wireless communication”. All types of paper are acceptable, whether theoretical, numerical, or experimental. Topics include, but are not limited to, the following:

  • Designs of visible-light/infra-red/ultra-violet OWC systems;
  • Estimations and modeling for free-space/indoor/underwater OWC channels;
  • Optical wireless signal processing;
  • Code and modulation schemes in OWC systems;
  • Micro-LED array based optical transmitters;
  • Photon-counting detection;
  • Power control and resource allocation in OWC systems;
  • High-rate and energy-efficient OWC techniques;
  • Physical-layer security of OWC systems;
  • Massive and random access OWC networks;
  • Optical intelligent reflecting surface;
  • Signal compensation under turbulence, beam misalignment, beam wander, etc.

Dr. Xiaolin Zhou
Guest Editor

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
  • signal processing
  • channel estimation
  • optical devices

Published Papers (4 papers)

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Research

12 pages, 4790 KiB  
Article
A Superimposed Codebook Design for Downlink Sparse Code Multiple Access Visible Light Communication System
by Jingxuan Dong, Zixiong Wang, Jinlong Yu and Yang Jiang
Photonics 2024, 11(4), 321; https://doi.org/10.3390/photonics11040321 - 29 Mar 2024
Viewed by 568
Abstract
The capacity performance of visible light communication (VLC) systems can be improved by using sparse code multiple access (SCMA). Since SCMA is a codebook-based multiple access scheme, the design of the codebook is crucial. SCMA codebook performance is severely affected by shot noise. [...] Read more.
The capacity performance of visible light communication (VLC) systems can be improved by using sparse code multiple access (SCMA). Since SCMA is a codebook-based multiple access scheme, the design of the codebook is crucial. SCMA codebook performance is severely affected by shot noise. Although several codebook design metrics have been proposed to compensate for the constellation distortion caused by shot noise, the improvement in performance is limited. In order to solve this problem, we use a separable codebook design structure to derive the analytical expression of the symbol error rate (SER) for the SCMA-VLC system under shot noise. According to the SER expression, we formulate an optimization problem and obtain a multi-user superimposed codebook to achieve a minimum SER for the SCMA-VLC system. The simulation results show that the proposed codebook significantly improves the performance of the SCMA-VLC system, especially in the case of high shot noise. Full article
(This article belongs to the Special Issue New Advances in Optical Wireless Communication)
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18 pages, 1117 KiB  
Article
Performance Analysis of Power Allocation and User-Pairing Techniques for MIMO-NOMA in VLC Systems
by Hesham S. Ibrahim, Mohamed Abaza, Ali Mansour and Ayman Alfalou
Photonics 2024, 11(3), 206; https://doi.org/10.3390/photonics11030206 - 25 Feb 2024
Viewed by 1047
Abstract
In this paper, we evaluate the performance of multiple-input multiple-output (MIMO) communication systems applied with a non-orthogonal multiple access (NOMA)-based indoor visible light communication (VLC). We present two efficient user-pairing algorithms for NOMA in VLC, aiming to enhance achievable data rates effectively. Our [...] Read more.
In this paper, we evaluate the performance of multiple-input multiple-output (MIMO) communication systems applied with a non-orthogonal multiple access (NOMA)-based indoor visible light communication (VLC). We present two efficient user-pairing algorithms for NOMA in VLC, aiming to enhance achievable data rates effectively. Our investigation involves the application of three low-complexity power allocation techniques. Comparative analysis reveals performance enhancements when employing the proposed schemes, especially when contrasted with NOMA without user pairing and orthogonal frequency division multiple access (OFDMA). Additionally, we explore the performance of both algorithms in scenarios with both even and odd numbers of users. Simulation results demonstrate the superiority of NOMA in comparison to OFDMA. Full article
(This article belongs to the Special Issue New Advances in Optical Wireless Communication)
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12 pages, 15814 KiB  
Article
Optical Signal Attenuation through Smog in Controlled Laboratory Conditions
by Hira Khalid, Sheikh Muhammad Sajid, Muhammad Imran Cheema and Erich Leitgeb
Photonics 2024, 11(2), 172; https://doi.org/10.3390/photonics11020172 - 12 Feb 2024
Viewed by 1016
Abstract
Free-space optical (FSO) communication is a line-of-sight (LOS) communication technology that uses light, typically lasers, to transmit data through the atmosphere. FSO can provide high data transfer rates, but factors like weather conditions can affect its performance. Like fog, smog also degrades the [...] Read more.
Free-space optical (FSO) communication is a line-of-sight (LOS) communication technology that uses light, typically lasers, to transmit data through the atmosphere. FSO can provide high data transfer rates, but factors like weather conditions can affect its performance. Like fog, smog also degrades the availability and reliability of FSO links, as the particulate matter (PM) present in smog scatters the light beam, causing perceptible attenuation. In this paper, we have investigated the attenuation of an optical signal under laboratory-controlled smog conditions, using both theoretical and experimental approaches. A 6 m long acrylic chamber is used to contain artificial smog and measure the optical attenuation through it. The experimental result shows that smog attenuation is approximately 1.705 times more than fog attenuation. The findings of this study offer valuable insights into the effects of smog on optical links and can contribute to the development and optimization of these systems in regions with high levels of smog. Full article
(This article belongs to the Special Issue New Advances in Optical Wireless Communication)
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9 pages, 347 KiB  
Communication
Gaussian-Shaped Free-Space Optical Beam Intensity Estimation in Detector Arrays
by Muhammad Ali Umair, Hira Khalid, Sheikh Muhammad Sajid and Hector E. Nistazakis
Photonics 2023, 10(8), 930; https://doi.org/10.3390/photonics10080930 - 14 Aug 2023
Viewed by 891
Abstract
Photon counting detector arrays are commonly used for deep space optical communication receivers operating on the principle of intensity modulation/direct detection (IM/DD). In scenarios where beam parameters can vary at the receiver due to scattering, it is important to estimate beam parameters in [...] Read more.
Photon counting detector arrays are commonly used for deep space optical communication receivers operating on the principle of intensity modulation/direct detection (IM/DD). In scenarios where beam parameters can vary at the receiver due to scattering, it is important to estimate beam parameters in order to minimize the probability of error. The use of array of detectors increases the sensitivity of the receiver as compared to single photo-detector of the same size. In this paper, we present the derivation of a maximum likelihood estimator (ML) for peak optical intensity, providing both numerical and closed form expressions for the estimator. Performance of both forms of ML estimator are compared using the mean squared error (MSE) criterion and Cramer–Rao Lower Bound (CRLB) is also derived to assess the proposed estimator’s efficiency. This research contributed to the advancement of estimation techniques and has practical implications for optimizing deep space optical communication systems. Full article
(This article belongs to the Special Issue New Advances in Optical Wireless Communication)
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