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Telecom
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Advances in Optical Wireless Communication
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Advances in Optical Wireless Communication

A special issue of Telecom (ISSN 2673-4001).

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 18746

Special Issue Editors

Dr. Iman Tavakkolnia

E-Mail Website
Guest Editor
Department of Electronic and Electrical Engineering, University of Strathclyde, Glasgow, UK
Interests: optical fibre communication; photovoltaics for data communication; optical wireless communication (OWC); Light-Fidelity (LiFi)
Dr. Mohammad Dehghani Soltani

E-Mail Website
Guest Editor
Institute for Digital Communications, School of Engineerin, University of Edinburgh, Edinburgh, Scotland, UK
Interests: optical wireless communication (OWC); Light-Fidelity (LiFi)

Special Issue Information

Dear Colleagues,

Optical wireless communication (OWC) and Light-Fidelity (LiFi) have been proven to be part of the future communication systems that provide secure high-speed communication and use the light spectrum to relieve some of the pressure on the already congested radio frequency (RF). With the anticipated growth of the Internet of Things (IoT), involving hundreds of billions of devices in the next 10 years, the demand for bandwidth and data rate will also increase. Many aspects of OWC and LiFi have been investigated in recent years. However, a number of problems, such as energy efficiency and seamless integration into the existing infrastructure, still need to be solved for real-world implementation in everyday life. This Special Issue therefore aims to focus on the latest advances in the design and implementation of OWC and LiFi with applications in current (e.g., 5G) and future communication systems (i.e., 6G and beyond). Authors are invited to submit original research articles or comprehensive reviews on topics including (but not limited to):

  • IoT enabled by OWC;
  • Solar cells as optical receivers;
  • Energy efficiency of OWC systems;
  • Physical layer security enhancement for optical wireless links;
  • Hybrid optical wireless/RF networks;
  • The application of artificial intelligence (AI) in OWC;
  • Network design for integration of LiFi in communication networks;
  • Highspeed point-to-point communication for backhaul links;
  • Application of OWC in vehicular communication;
  • Channel modelling and signal processing for LiFi.

Dr. Iman Tavakkolnia
Dr. Mohammad Dehghani Soltani
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. Telecom is an international peer-reviewed open access quarterly 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 1200 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 (OWC)
  • Light-Fidelity (LiFi)
  • visible light communications (VLC)
  • energy efficiency of OWC
  • Internet-of-Things (IoT)

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Published Papers (5 papers)

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Research

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16 pages, 2450 KiB  
Article
Experimental Evaluation of Hybrid Fibre–Wireless System for 5G Networks
by Muhammad Usman Hadi, Jian Song, Sunish Kumar Orappanpara Soman, Ardavan Rahimian and Adnan Ahmad Cheema
Telecom 2022, 3(2), 218-233; https://doi.org/10.3390/telecom3020014 - 2 Apr 2022
Cited by 2 | Viewed by 3890
Abstract
This article describes a novel experimental study considering a multiband fibre–wireless system for constructing the transport network for fifth-generation (5G) networks. This study describes the development and testing of a 5G new radio (NR) multi-input multi-output (MIMO) hybrid fibre–wireless (FiWi) system for enhanced [...] Read more.
This article describes a novel experimental study considering a multiband fibre–wireless system for constructing the transport network for fifth-generation (5G) networks. This study describes the development and testing of a 5G new radio (NR) multi-input multi-output (MIMO) hybrid fibre–wireless (FiWi) system for enhanced mobile broadband (eMBB) using digital pre-distortion (DPD). Analog radio over fibre (A-RoF) technology was used to create the optical fronthaul (OFH) that includes a 3 GHz supercell in a long-range scenario as well as a femtocell scenario using the 20 GHz band. As a proof of concept, a Mach Zehnder modulator with two independent radio frequency waveforms modifies a 1310 nm optical carrier using a distributed feedback laser across 10 km of conventional standard single-mode fibre. It may be inferred that a hybrid FiWi-based MIMO-enabled 5G NR system based on OFH could be a strong competitor for future mobile haul applications. Moreover, a convolutional neural network (CNN)-based DPD is used to improve the performance of the link. The error vector magnitude (EVM) performance for 5G NR bands is predicted to fulfil the Third Generation Partnership Project’s (3GPP) Release 17 standards. Full article
(This article belongs to the Special Issue Advances in Optical Wireless Communication)
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15 pages, 3112 KiB  
Article
Practical Demonstration of 5G NR Transport Over-Fiber System with Convolutional Neural Network
by Muhammad Usman Hadi
Telecom 2022, 3(1), 103-117; https://doi.org/10.3390/telecom3010006 - 2 Feb 2022
Cited by 6 | Viewed by 3916
Abstract
This study describes an experimental realization using digital predistortion (DPD) for a fifth generation (5G) multiband new radio (NR) optical front haul (OFH) based Radio over Fiber (RoF) link. For the performance enhancement and complexity reduction of RoF links, a novel Convolutional Neural [...] Read more.
This study describes an experimental realization using digital predistortion (DPD) for a fifth generation (5G) multiband new radio (NR) optical front haul (OFH) based Radio over Fiber (RoF) link. For the performance enhancement and complexity reduction of RoF links, a novel Convolutional Neural Network (CNN) based DPD technique is proposed, followed by comparisons with the generalised memory polynomial (GMP) based DPD method. To support enhanced mobile broad band scenario, the experimental testbed uses the 5G NR waveforms at 10 GHz with 20 MHz bandwidth and a flexible-waveform signal at 3 GHz with 20 MHz bandwidth. For 10 km of typical single mode fiber, a Mach Zehnder Modulator with two distinct radio frequency waveforms modulates a 1310 nm optical carrier utilizing distributed feedback laser. The error vector magnitude and number of estimated coefficients, and multiplications are all used to describe the experimental outcomes. The goal of the research is to see if CNN-based DPD improves performance while lowering complexity levels to meet 3GPP Release 17 criteria. Full article
(This article belongs to the Special Issue Advances in Optical Wireless Communication)
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26 pages, 3045 KiB  
Article
Backscattered Visible Light Sensing of Retroreflective Foils Utilizing Random Forest Based Classification for Speed and Movement Direction Determination and Identification of an Indoor Moving Object
by Andreas Peter Weiss and Franz Peter Wenzl
Telecom 2021, 2(4), 574-599; https://doi.org/10.3390/telecom2040032 - 13 Dec 2021
Cited by 4 | Viewed by 2752
Abstract
Making the Internet of Things “green” has become a major research focus in recent years. The anticipated massive increase in the numbers of sensor and communication devices makes this endeavor even more important, resulting in various solution approaches ranging from energy harvesting to [...] Read more.
Making the Internet of Things “green” has become a major research focus in recent years. The anticipated massive increase in the numbers of sensor and communication devices makes this endeavor even more important, resulting in various solution approaches ranging from energy harvesting to energy efficient routing schemes. In this work, we propose a system that can perform some of the main tasks of the Internet of Things, namely identification and sensing of an indoor moving object, by the means of visible light sensing in combination with off-the-shelf retroreflective foils, without the necessity to place any actively powered components on the object itself. By utilizing the supervised machine learning approach of random forest, we show that these two tasks can be fulfilled with up to 99.96% accuracy. Based on our previous findings in this regard, we propose some advancements and improvements of the overall system, yielding better results in parallel with an increased complexity of the system. Furthermore, we expand the number of performable tasks toward additional movement direction determination. The achieved results demonstrate the applicability of visible light sensing and its potentials for a “green” Internet of Things. Full article
(This article belongs to the Special Issue Advances in Optical Wireless Communication)
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Review

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20 pages, 2415 KiB  
Review
A Brief Overview of Energy Efficiency Resources in Emerging Wireless Communication Systems
by Augustus Ehiremen Ibhaze, Agbotiname Lucky Imoize and Obinna Okoyeigbo
Telecom 2022, 3(2), 281-300; https://doi.org/10.3390/telecom3020016 - 28 Apr 2022
Cited by 13 | Viewed by 4286
Abstract
It is crucial to design new communication technologies to surmount the setbacks in RF communication systems. A suitable energy-efficiency scheme helps evade needless energy consumption in wireless communication. Appropriate choice of the most suitable energy-efficiency scheme aids in selecting the most energy-efficient equipment [...] Read more.
It is crucial to design new communication technologies to surmount the setbacks in RF communication systems. A suitable energy-efficiency scheme helps evade needless energy consumption in wireless communication. Appropriate choice of the most suitable energy-efficiency scheme aids in selecting the most energy-efficient equipment to minimize the expense of energy towards decreasing individual network element energy consumption without affecting their unique features. This review presents the energy efficiency challenges in wireless communication by employing different technologies. The emergence of visible light communication (VLC) provides an energy-efficient wireless communication system despite the various challenges inherent in its adoption that limit its physical realization. This work seeks to harness the potential of the transmission capabilities of VLC while providing an insight into novel practical implementation techniques. The work also addresses the energy consumption problem of low-active components and idle period of active components of base stations by using sleep modes for their systematic turning off and on. The high cost of power supply and the environmental emission of gases from base stations are also addressed by integrating a renewable energy resource into the conventional standalone diesel generators. Overall, the work provides an overview of information necessary for foundational research in energy-efficient resources applied to emerging wireless communication systems. Full article
(This article belongs to the Special Issue Advances in Optical Wireless Communication)
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17 pages, 2671 KiB  
Review
Wideband Mixed Signal Separation Based on Photonic Signal Processing
by Yang Qi, Taichu Shi and Ben Wu
Telecom 2021, 2(4), 413-429; https://doi.org/10.3390/telecom2040024 - 2 Nov 2021
Cited by 2 | Viewed by 2780
Abstract
The growing needs for high-speed and secure communications create an increasing challenge to the contemporary framework of signal processing. The coexistence of multiple high-speed wireless communication systems generates wideband interference. To protect the security and especially the privacy of users’ communications requires stealth [...] Read more.
The growing needs for high-speed and secure communications create an increasing challenge to the contemporary framework of signal processing. The coexistence of multiple high-speed wireless communication systems generates wideband interference. To protect the security and especially the privacy of users’ communications requires stealth communication that hides and recovers private information against eavesdropping attacks. The major problem in interference management and stealth information recovery is to separate the signal of interest from wideband interference/noise. However, the increasing signal bandwidth presents a real challenge to existing capabilities in separating the mixed signal and results in unacceptable latency. The photonic circuit processes a signal in an analog way with a unanimous frequency response over GHz bandwidth. The digital processor measures the statistical patterns of the signals with sampling rate orders of magnitude smaller than the Nyquist frequency. Under-sampling the signals significantly reduces the workload of the digital processor while providing accurate control of the photonic circuit to perform the real-time signal separations. The wideband mixed signal separation, based on photonic signal processing is scalable to multiple stages with the performance of each stage accrued. Full article
(This article belongs to the Special Issue Advances in Optical Wireless Communication)
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