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Journal articles on the topic 'Free Wireless Fidelity'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Udeh, Ezejiofo Patrick. "Exploring User Acceptance of Free Wireless Fidelity Public." Human Technology: An Interdisciplinary Journal on Humans in ICT Environments 4, no. 2 (2008): 144–68. http://dx.doi.org/10.17011/ht/urn.200810245834.

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Rizal, Ula Ananta Fauzi. "THE ROLE OF FREE WIRELESS FIDELITY (WI-FI) SERVICE, FOOD QUALITY, AND SERVICESCAPE TOWARD CUSTOMER SATISFACTION." Asian Journal of Social Science Research 2, no. 2 (2019): 26–35. https://doi.org/10.5281/zenodo.8107063.

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<strong>ABSTRACT</strong> Culinary tourism is still one of the people's choices in Indonesia. Many culinary businesses field requires competitive strategies to get an edge. The purpose of this study was to examine the effect of Free Wireless Fidelity (Wifi) services, Food Quality and ServiceScape toward Customer Satisfaction. This research was conducted in 4 cafes in Madiun with a sample of 125 respondents. We use multiple regression statistical analyses were performed in this study. The research indicates that the Free Wireless Fidelity (Wi-Fi) Service and Servicescape have a positive inf

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Dewi, Aida, Hartanto Hartanto, and Arvita Hastarini. "ILLEGAL ACCESS THROUGH "WIRELESS FIDELITY" IN CRIMINAL LAW." Jurnal Meta-Yuridis 6, no. 2 (2023): 78–89. http://dx.doi.org/10.26877/m-y.v6i2.15386.

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The internet is a sophisticated tool for exchanging information, various fields from law to medical sciences (medicine) have also used the internet on a large scale. The use of wireless fidelity is also quite attractive for those who need free internet access. But it is undeniable that in addition to some people hoping to use the free internet, it will also cause the desire of people who want to use it as a means of other crimes. The purpose of this study is to examine cases of internet data theft through wireless fidelity within the scope of criminal law. Our criminal law as the backbone, nam

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Idris, I. S., and A. Isa. "Trends in the Use of Wireless Fidelity on Campus among Undergraduates in Usmanu Danfodiyo University, Sokoto." Zamfara International Journal of Education (ZIJE) 3, no. 1 (2023): 132–39. https://doi.org/10.5281/zenodo.8371331.

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This study investigates the trends in the use of wireless fidelity (Wi-Fi) on campus among undergraduates in Usmanu Danfodiyo University, Sokoto (UDUS). Four objectives were formulated at the onset of this study. Survey research design was adopted, and simple random sampling technique was used to select three hundred and ninety-six (396) students as sample using questionnaire as instrument for data collection. It was found that undergraduate make use of wireless fidelity available to them basically for academic purposes. Amount of time students spend carrying textbooks is reducing drastically

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Gokul, M., C. Geetha Anandhi, R. Monisha, et al. "Design and Development of Electrogastrograph Wireless Electrode Module." Journal of Physics: Conference Series 2318, no. 1 (2022): 012005. http://dx.doi.org/10.1088/1742-6596/2318/1/012005.

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Abstract Electrogastrography is a pain free diagnosing method for evaluating stomach myoelectric activity. People are drawn to EGG because it is painless diagnostic procedure. However, given to its non-invasive characteristics, there has been significant debate about the validity and applicability of EGG. The major goal of this project is to decouple the electrode-equipment probe connection. This enhances the patient’s mobility (infant, athlete, handicapped) while lowering probe-to-electrode misconnection. This portable electrode system allows physicians and nurses to examine data of a patient

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Faruq, Omar, Kazi Rubaiyat Shahriar Rahman, Nusrat Jahan, Sakib Rokoni, and Mosa Rabeya. "Li-Fi Technology Based Long Range Free-Space Optics Data Transmit System Evaluation." ICST Transactions on Mobile Communications and Applications 7, no. 4 (2023): e3. http://dx.doi.org/10.4108/eetmca.v7i4.2940.

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INTRODUCTION: The most flexible and reliable technological system is Wi-Fi, which is made possible by a wireless connection that transmits data using radio frequencies. Wi-Fi networks, however, encounter numerous issues related to power supply, availability, efficiency, and security as a result of the various access points. While relational waves describe the medical device, Wi-Fi radios produce radio waves that are very dangerous for patients. This document offers line-of-sight communication between the transmitter and receiver using LED technology. Li-Fi technology is a method that transmits

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Collins, Galen R. "Key Planning Factors for Deploying Ubiquitous Wi-Fi Networks in Hotels." International Journal of Tourism and Hospitality Management in the Digital Age 1, no. 2 (2017): 18–31. http://dx.doi.org/10.4018/ijthmda.2017070102.

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The Internet has changed the way in which people work and live. Many when traveling expect to be Internet-connected at all times without being tied down to physical wires, just as in their offices and homes. Wireless Fidelity (Wi-Fi) enables hotel guests with wireless-capable computers and devices to easily access high speed broadband networks within the coverage area. According to J.D. Power and Associates 2016 North America Hotel Guest Satisfaction Index Study, the most important amenity noted by guests was free Wi-Fi. Wi-Fi, initially deployed in public spaces, is now an expected room ameni

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Kalam, M. Zatiar Erwan, Ni Made Ary Esta Dewi Wirastuti, and I. Made Oka Widyantara. "Analisa Kinerja Penerapan Standard Protokol Keamanan IEEE 802.11 Pada Layanan Wireless Fidelity." Majalah Ilmiah Teknologi Elektro 20, no. 1 (2021): 89. http://dx.doi.org/10.24843/mite.2021.v20i01.p10.

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Jaringan komunikasi semakin bergantung pada WLAN, maka semakin tinggi tuntutan Quality of Service (QoS) WLAN seperti Throughput, delay, dan jitter Untuk menjaga keamanan media komunikasi data, maka digunakan mekanisme keamanan jaringan Wired Equivalent Privacy (WEP), WiFi Protected Access (WPA), dan WPA2 [14]. Mall Bali Galeria memiliki beberapa alternatif Free WiFi. Banyaknya Wi-Fi yang terpasang menimbulkan permasalahan interferensi yang mempengaruhi unjuk kerja jaringan WiFi, MBG sendiri memiliki area Indoor dan Outdoor, Alternatif untuk mengatasi interferensi adalah dengan melakukan automa

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Roohi, Gooty, Priya A. L. Vaishnavi, and P. Madhumathy. "Smart Home Automation Using Li-Fi Technology: A Novel Approach for IoT Integration and Data Communication." Journal of Control System and its Recent Developments 8, no. 1 (2025): 14–24. https://doi.org/10.5281/zenodo.14792221.

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<em>Li-Fi (Light Fidelity) technology offers a promising alternative to conventional wireless communication technologies such as Wi-Fi and Bluetooth in smart home environments. By leveraging visible light communication (VLC), Li-Fi enables secure, high-speed, and interference-free data transmission. This paper explores the integration of Li-Fi in smart home automation, detailing its system design, implementation, and analytical survey of performance. The study identifies challenges, research directions, and potential improvements, paving the way for enhanced IoT integration and energy efficien

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Alnajjar, Satea Hikmat, and Ahmed Majid Hameed. "Light fidelity performance via hybrid free space optic/fiber optic communication under atmospheric disturbance." Indonesian Journal of Electrical Engineering and Computer Science 27, no. 1 (2022): 355. http://dx.doi.org/10.11591/ijeecs.v27.i1.pp355-365.

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Light f idelity (Li-Fi) considers technology in optical wireless communication (OWC) that utilize visible light for transmission in free space, visible light communication (VLC) technology was chosen to overcome the interference issues of radio frequency (RF) communication and it also has higher bandwidth and is more secure. This paper aims to analyse the influence of atmospheric attenuation on the end-users of VLC system that consisted of five light-emitting diodes (LEDs) distributed in a room, which in t urn linked with the hybrid optical system includes a multi-channel of free space optic (

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Alnajjar, Satea Hikmat, and Ahmed Majid Hameed. "Light fidelity performance via hybrid free space optic/fiber optic communication under atmospheric disturbance." Indonesian Journal of Electrical Engineering and Computer Science 27, no. 1 (2022): 355–65. https://doi.org/10.11591/ijeecs.v27.i1.pp355-365.

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Light fidelity (Li-Fi) considers technology in optical wireless communication (OWC) that utilize visible light for transmission in free space, visible light communication (VLC) technology was chosen to overcome the interference issues of radio frequency (RF) communication and it also has higher bandwidth and is more secure. This paper aims to analyse the influence of atmospheric attenuation on the end-users of VLC system that consisted of five light-emitting diodes (LEDs) distributed in a room, which in turn linked with the hybrid optical system includes a multichannel of free space optic (FSO

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Surasinghe, K. A. K. S., and Y. A. A. Kumarayapa. "Low Cost Led Source Based Transmission System for Achieving Freespace Li-Fi Multimedia Communication." International Journal of Research and Scientific Innovation XI, no. VI (2024): 667–71. http://dx.doi.org/10.51244/ijrsi.2024.1106051.

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Physical network layer linking microprocessors are often used in congested office rooms. In forming new extensions with physical networking cables, may not be faceable or may not advantageous. Linking such communication to devices through free space transmission of multimedia signals with the use of optoelectronic devices is a major developing research area today. For that, different low cost optoelectronic sources were need to be tested while the same source should be able to use for normal light illumination of such office rooms. During this research project, a novel multimedia transmission

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Isbat, Ahmed, Shakhawat Hossain Mohammad, and Ahmed Khan Tanvir. "LI-FI Communication Systems: Prospects & Challenges." Asian Journal of Contemporary Science and Technology 2, no. 1 (2020): 01–04. https://doi.org/10.5281/zenodo.3605613.

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<em>Light Fidelity (Li-Fi) is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. Li-Fi is designed for data transfer system by using LED light bulbs similar to those are currently in used in many energy-conscious home and offices. However, Li-Fi is a wireless technology that holds the key to solve upcoming challenges faced by 5<sup>th</sup> Generation (5G) technology. This technology can transmit data at multiple gigabits, is more authenticated, virtually interference-free and uniquely more secure than radio technology such as Wi-Fi or cellul

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Reddy, Shilpa, and Sai Ram. "Lifi-Wifi Integration for Data Transmission." International Research Journal of Computer Science 12, no. 04 (2025): 189–94. https://doi.org/10.26562/irjcs.2025.v1204.13.

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The With the increasing demand for high-speed, secure, and interference-free wireless communication, traditional radio-frequency (RF) technologies such as Wi-Fi face limitations like electromagnetic interference, bandwidth congestion, and security vulnerabilities. This paper proposes a hybrid communication system that integrates Light Fidelity (LiFi) and Wi-Fi for efficient real-time environmental monitoring. The system utilizes an Arduino microcontroller connected to temperature, gas, and humidity sensors to collect data. LiFi is employed for high-speed, short-range data transmission using vi

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Ullah, Shakir, Saeed Ur Rehman, and Peter Han Joo Chong. "A Comprehensive Open-Source Simulation Framework for LiFi Communication." Sensors 21, no. 7 (2021): 2485. http://dx.doi.org/10.3390/s21072485.

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Light Fidelity (LiFi) is a new candidate for wireless networking that utilizes the visible light spectrum and exploits the existing lighting infrastructure in the form of light-emitting diodes (LEDs). It provides point-to-point and point-to-multipoint communication on a bidirectional channel at very high data rates. However, the LiFi has small coverage, and its optical gain is closely related to the receiver’s directionality vis-à-vis the transmitter, therefore it can experience frequent service outages. To provide reliable coverage, the LiFi is integrated with other networking technologies su

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Satea H. Alnajjar. "Improving the Hybrid FSO/LI-FI/UWOC Network's." International Journal of Latest Technology in Engineering Management & Applied Science 14, no. 1 (2025): 21–29. https://doi.org/10.51583/ijltemas.2025.140104.

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Abstract: Optical wireless communications are an alternative approach to address the challenges in completing the deployment of terrestrial networks to underwater optical wireless communication (UWOC) environments. This study aims to investigate the effectiveness of a free-space optical (FSO) channel system to feed light-fidelity Li-Fi-closed underwater platforms that, in turn, supply the non-line-of-sight (NLOS) link with the proper communications. The FSO link faces the challenge of attenuation due to the surrounding environment, which in turn negatively affects the communication link reachi

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Sun, Y. Y., S. W. Cheung, and T. I. Yuk. "Planar Monopoles with Different Radiator Shapes for UWB Body-Centric Wireless Communications." Journal of Engineering 2013 (2013): 1–13. http://dx.doi.org/10.1155/2013/683428.

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This paper presents a study on the performances of a group of planar monopoles using radiators of different shapes, such as triangle, rectangle, square, annual ring, circle, horizontal ellipse, vertical ellipse, pentagon, and hexagon, for ultra-wideband (UWB) body-centric wireless communications. The planar monopoles have the radiators with microstrip-fed line printed on one side of the substrate and a ground plane on the other side. Simulation studies show that, among these monopoles, the horizontal elliptical, vertical elliptical, and hexagonal monopoles have better overall performances in t

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Chowdhury, Mostafa Zaman, Md Shahjalal, Moh Khalid Hasan, and Yeong Min Jang. "The Role of Optical Wireless Communication Technologies in 5G/6G and IoT Solutions: Prospects, Directions, and Challenges." Applied Sciences 9, no. 20 (2019): 4367. http://dx.doi.org/10.3390/app9204367.

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The upcoming fifth- and sixth-generation (5G and 6G, respectively) communication systems are expected to deal with enormous advances compared to the existing fourth-generation communication system. The few important and common issues related to the service quality of 5G and 6G communication systems are high capacity, massive connectivity, low latency, high security, low-energy consumption, high quality of experience, and reliable connectivity. Of course, 6G communication will provide several-fold improved performances compared to the 5G communication regarding these issues. The Internet of Thi

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Kinny, Tyran, Franklin Puthuva, Ashore Komban, and Dipti Belekar. "DATA COMMUNICATION USING VISIBLE LIGHT." International Journal of Students' Research in Technology & Management 3, no. 5 (2015): 358–62. http://dx.doi.org/10.18510/ijsrtm.2015.354.

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Visible Light Communication (VLC) using a Light Fidelity system, as proposed by a German physicist—Harald Haas, provides transmission of data through illumination by sending data through an LED light source that varies in intensity that can be controlled and adjusted such that it appears as normal light to the naked human eye. Here the property of persistence of vision of the human eye is exploited for additional application of a free, sustainable and green source that can be used for wireless communication at very fast data rates. This paper focuses on developing a low cost Li-Fi based system

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Rante, Julie Cynthia, and Max Alexander Rura Patras. "ANALISIS KEKUATAN SINYAL WI-FI MENGGUNAKAN INSSIDER." Jurnal Ilmiah Realtech 14, no. 1 (2018): 97–102. http://dx.doi.org/10.52159/realtech.v14i1.124.

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Wi-Fi atau Wireless Fidelity merupakan teknologi jaringan tanpa kabel yang menggunakan frekuensi tinggi. Frekuensi yang digunakan oleh teknologi Wi-Fi berada pada spektrum 2,4 GHz dan beroperasi dengan menggunakan spesifikasi dasar IEEE 802.11. Wi-Fi telah menjadi terminologi umum yang digunakan oleh semua orang tetapi tidak banyak yang tahu tentang faktor kinerja dari jaringan Wi-Fi dan bagaimana semua perangkat dapat tetap terhubung denganaccess points. Pada artikel ini, akan ditampilkan hasil analisis kekuatan sinyal Wi-Fi pada area kampus Universitas Katolik De La Salle Manado (dalam hal i

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Suroso, Dwi Joko, Farid Yuli Martin Adiyatma, and Panarat Cherntanomwong. "Wi-Fi Sensing for Indoor Localization via Channel State Information: A Survey." ELKHA 15, no. 2 (2023): 152. http://dx.doi.org/10.26418/elkha.v15i2.70830.

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Wireless Fidelity (Wi-Fi) sensing utilization has been widespread, especially for human behavior/activity recognition. It provides high flexibility since it does not require the person/object to carry any device known as device-free. This "passive" concept is also helpful for another application of Wi-Fi sensing, i.e., indoor localization. The "sensing" is conducted using particular parameters extracted from communication links of Wi-Fi devices, i.e., channel state information (CSI). This paper explores the recent trends in CSI-based indoor localization with Wi-Fi technology as its core, inclu

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Keshary, Abhinav. "Light Fidelity (Li-Fi) in Aerospace: A New Frontier for High-Speed Data Transmission." International Journal for Research in Applied Science and Engineering Technology 13, no. 5 (2025): 6809–11. https://doi.org/10.22214/ijraset.2025.71524.

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The demand for high-speed, secure, and interference-free data communication in aerospace systems has accelerated the search for alternatives to traditional radio frequency (RF) technologies. Light Fidelity (Li-Fi), a wireless communication system that uses light-emitting diodes (LEDs) to transmit data, has emerged as a promising solution. Li-Fi offers significantly higher bandwidth, enhanced data security, and immunity to electromagnetic interference—qualities that are critical in aerospace environments such as aircraft cabins, satellites, and space stations. During my year-long study of Li-Fi

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Le, Duy Tuan Anh, Huy Nguyen, and Yeong Min Jang. "An Experimental Demonstration of 2D-Multiple-Input-Multiple-Output-Based Deep Learning for Optical Camera Communication." Applied Sciences 14, no. 3 (2024): 1003. http://dx.doi.org/10.3390/app14031003.

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Currently, radio frequency (RF) waveforms are widely used in wireless communication systems and are widely used in many fields to improve human quality of life. In Internet of Things (IoT) systems and satellite systems, the installation and deployment of wireless communication systems have become easier and offer many advantages compared to wired communication. However, high RF frequencies can have detrimental effects on the human body. Therefore, the visible light bandwidth is being researched and used as a replacement for RF in certain wireless communication systems. Several strategies have

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Ullah, Shahid, Cunjun Ruan, Muhammad Shahzad Sadiq, Tanveer Ul Haq, Ayesha Kosar Fahad, and Wenlong He. "Super Wide Band, Defected Ground Structure (DGS), and Stepped Meander Line Antenna for WLAN/ISM/WiMAX/UWB and other Wireless Communication Applications." Sensors 20, no. 6 (2020): 1735. http://dx.doi.org/10.3390/s20061735.

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This paper presents a new shape (s-shape monopole) of a super wideband antenna using stepped meander lines, a quarter waveguide transformer feeding line, and a defected ground structure (DGS). The antenna will be used for multiple wireless communication applications like WIMAX/WLAN/ISM/UWB, and also for several wireless communication applications. The total dimensions of the proposed antenna are 35 mm × 35 mm × 1.57 mm or 0.36 λo × 0.36 λo × 0.016 λo, which are the corresponding electrical dimensions with free-space wavelength (λo) at the lower operating frequency. The antenna is designed and

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Nurbayatin, Anita, Widjiati Widjiati, Relly Yanuari Primariawan, Bambang Poernomo, Sulistiawati Sulistiawati, and Rina Yudiwati. "RADIATION EFFECT OF WIRELESS FIDELITY (Wi-Fi) ON OOCYTE NUMBER OF OOCYTE STIMULATION IN MICE (Mus Musculus)." Folia Medica Indonesiana 53, no. 3 (2017): 169. http://dx.doi.org/10.20473/fmi.v53i3.6440.

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Infertility is a problem experienced by some women and men around the world. Most infertility problems in women is caused by impaired reproductive organs or disrupted ovulation.. One factor that causes impaired oocyte maturation is wireless fidelity (Wi-Fi) radiation which has a radio frequency field of 2.45 GHz. The radiation may increase the activity of free radical cells through the fenton reaction pathways that cause infertility because of the disrupted oocyte development. This study aimed to determine the effect of Wi-Fi radiation on the number of oocytes. This was an experimental study u

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Bai, Wubin. "(Invited) Orbit Symmetry Breaking in Mxene Implements Enhanced Soft Bioelectronic Systems." ECS Meeting Abstracts MA2024-01, no. 33 (2024): 1638. http://dx.doi.org/10.1149/ma2024-01331638mtgabs.

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Bioelectronic systems with soft mechanics, stable biocompatibility, and high-performance electronic recording and stimulation interfaces to internal organs offer paradigm-shifting potentials for advancing biomedical implants such as those for cardiovascular disease. Yet, challenges remain in the development of biocompatible materials with practical scalability for constructing bioelectronic systems that leverage performance and interfacial attributes to not only functionally approach those of conventional wafer-based technologies but also biologically compatible for long-term in-body operation

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Kumaran, Nithila, and Kavitha Arunachalam. "Low-profile high impedance surface on magneto-dielectric nanocomposite for wideband absorption of mobile phone radiation." International Journal of Applied Electromagnetics and Mechanics 67, no. 4 (2021): 487–506. http://dx.doi.org/10.3233/jae-210092.

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An electrically thin (0.024𝜆0) high-impedance surface (HIS) on a magneto-dielectric nanocomposite (NC) is presented as an external shield for wideband absorption of mobile phone radiation. Characterization of the NC and numerical design and analysis of the miniaturized HIS unit cell on NC (0.088𝜆0 × 0.088𝜆0) are presented over 0.85–6 GHz, where 𝜆0 is the free space wavelength at the absorber resonant frequency. The absorber performance is assessed using a mobile phone handset at 0.9 and 1.8 GHz Global System for Mobile Communications (GSM) frequencies and 2.4 GHz Wireless Fidelity (WiFi) frequ

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P, Venkatesh, Narmadha T V, Ponnrajakumari M, and Lavanya K. "Time Domain and Qualitative Analysis of a Compact Asymmetrically Fed Circular UWB Antenna for WBAN Scenarios." International journal of electrical and computer engineering systems 16, no. 1 (2025): 39–51. https://doi.org/10.32985/ijeces.16.1.5.

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This article presents about the design, time domain analysis and qualitative analysis of a circular monopole Ultra Wideband (UWB) antenna for Wireless Body Area Networks (WBAN) applications. The size of the proposed antenna is 30 x 30 x 1 mm3. The proposed antenna provides Ultra wide bandwidth from 2 – 10 GHz and also complies with IEEE C95.3 safety standards. The simulated and measured results are close to each other with minimum deviations. To ensure proper and less distorted communication in real time scenarios, time domain analysis was done for free space, on body and off body conditions.

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Okabe, Atsuyuki, Toshiaki Satoh, Kayo Okabe, et al. "Applicability of a Wireless Fidelity Positioning System to Tracking Free-range Domestic Fowl (Gallus gallus domesticus) and Helmeted Guineafowl (Numida meleagris galeata)." Journal of the Yamashina Institute for Ornithology 38, no. 1 (2006): 30–39. http://dx.doi.org/10.3312/jyio.38.30.

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Rushikesh, Bobade, Nikam Tushar, Kagade Suraj, Patil Shrinivas, and Jadhav Sangeeta. "Li-Fi Enabled Communication Framework for Inter- Networking." Research and Applications: Embedded System 8, no. 2 (2025): 33–40. https://doi.org/10.5281/zenodo.15371681.

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<em>In recent years, advancements in wireless communication have paved the way for innovative technologies in intelligent transportation systems (ITS). One such emerging technology is Light Fidelity (Li- Fi), which utilizes visible light for high-speed, secure, and interference-free data transmission. This project focuses on the implementation of Vehicle-to-Vehicle (V2V) communication using Li-Fi technology to enhance road safety and enable real-time data exchange between vehicles. The proposed system integrates various sensors, including gas, ultrasonic, and vibration sensors, to continuously

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Altakhaineh, Amjaad T., Saqer S. Alja’afreh, Aser M. Almatarneh, Eqab Almajali, Luae Al-Tarawneh, and Jawad Yousaf. "A Quad-Band Shared-Aperture Antenna Based on Dual-Mode Composite Quarter-Mode SIW Cavity for 5G and 6G with MIMO Capability." Electronics 12, no. 11 (2023): 2480. http://dx.doi.org/10.3390/electronics12112480.

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This study introduces a new design for an ultra-compact shared-aperture antenna utilizing a quarter-mode substrate integrated waveguide (QMSIW) cavity. The proposed antenna operates as a 4 × 4 multi-input multi-output (MIMO) system in three 5G/6G millimeter-wave (MMw) bands, while functioning as a single element antenna for a 5.5 GHz wireless fidelity Microwave (Mw) band. The antenna comprises four QMSIW cavity resonators; each QMSIW is loaded with dual slots to produce tri-band MMw operation at 28 GHz, 38 GHz, and 0.13 THz. The four cavities are arranged to reuse the entire aperture by creati

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Raj, A. Arockia Bazil, Prabu Krishnan, Ucuk Darusalam, et al. "A Review–Unguided Optical Communications: Developments, Technology Evolution, and Challenges." Electronics 12, no. 8 (2023): 1922. http://dx.doi.org/10.3390/electronics12081922.

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This review paper discusses the complete evolution of free-space optical (FSO) communication, also known as unguided optical communication (UOC) technologies, all the way back to ancient man’s fire to today’s machine-learning-supported UOC systems. The principles, significance, and developments that have happened over the past several decades, as well as installation methodologies, technological limitations, and today’s challenges of UOCs are presented. All the subsets of UOC: FSO communication, underwater optical wireless communication (UOWC), and visible light communication (VLC), with their

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Jung, Hyunwoo, and Sung-Man Kim. "Experimental Demonstration of 3 × 3 MIMO LED-to-LED Communication Using RGB Colors." Sensors 21, no. 14 (2021): 4921. http://dx.doi.org/10.3390/s21144921.

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Optical wireless communication (OWC) is one of the promising candidates for beyond fifth-generation communication (B5G). Depending on the type of transmitters, receivers, and information carriers applied in the system, OWC can be categorized into visible light communication, light fidelity, free-space optical communication, optical camera communication, etc. In addition to these OWC subcategories, this paper proposes light-emitting diode (LED)-to-LED communication as another subcategory of OWC technique. Furthermore, we show an experimental demonstration of the multiple-input multiple-output (

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Alraih, Saddam, Ibraheem Shayea, Mehran Behjati, et al. "Revolution or Evolution? Technical Requirements and Considerations towards 6G Mobile Communications." Sensors 22, no. 3 (2022): 762. http://dx.doi.org/10.3390/s22030762.

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Ever since the introduction of fifth generation (5G) mobile communications, the mobile telecommunications industry has been debating whether 5G is an “evolution” or “revolution” from the previous legacy mobile networks, but now that 5G has been commercially available for the past few years, the research direction has recently shifted towards the upcoming generation of mobile communication system, known as the sixth generation (6G), which is expected to drastically provide significant and evolutionary, if not revolutionary, improvements in mobile networks. The promise of extremely high data rat

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Retscher, Guenther, Allison Kealy, Jelena Gabela, et al. "A benchmarking measurement campaign in GNSS-denied/challenged indoor/outdoor and transitional environments." Journal of Applied Geodesy 14, no. 2 (2020): 215–29. http://dx.doi.org/10.1515/jag-2019-0031.

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AbstractLocalization in GNSS-denied/challenged indoor/outdoor and transitional environments represents a challenging research problem. This paper reports about a sequence of extensive experiments, conducted at The Ohio State University (OSU) as part of the joint effort of the FIG/IAG WG on Multi-sensor Systems. Their overall aim is to assess the feasibility of achieving GNSS-like performance for ubiquitous positioning in terms of autonomous, global, preferably infrastructure-free positioning of portable platforms at affordable cost efficiency. In the data acquisition campaign, multiple sensor

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Majeed, Ammar, Rashudah, Muhammad, Nurul Mu'azzah, and Abbas. "Indoor Positioning Based Ranging: A Review and Literature Survey of UWB and Li-Fi Technologies." ELEKTRIKA- Journal of Electrical Engineering 23, no. 1 (2024): 18–30. http://dx.doi.org/10.11113/elektrika.v23n1.431.

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Why IPS (Indoor Positioning Systems)? This issue is one of the most challenging things to solve in wireless localization due to the lack of a Global Positioning System (GPS) and the existence of distinctive radio propagation characteristics. Although there are different localization options available, the accuracy of localization cannot satisfy customers' requirements. Positioning algorithms could be grouped into two groups, including range-based and range-free techniques. Before actually putting a localization technique into practice, the accuracy of those techniques is of the utmost importan

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Suroso, Dwi Joko, Aditya Bagus Krisnawan, Refa Rupaksi, and Singgih Hawibowo. "IMPLEMENTATION OF RANGE-BASED AND RANGE-FREE 3D INDOOR LOCALIZATION IN MULTI-STORY BUILDING BASED ON RSSI." ASEAN Engineering Journal 12, no. 1 (2022): 93–103. http://dx.doi.org/10.11113/aej.v12.16801.

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The real-life indoor localization implementation in a multi-story building is reasonably necessary. Multi-floor shopping centers, airports, residential areas, especially in the big cities, apply positioning schemes to ease visitors or inhabitants. However, most indoor localization researches still emphasize 2D-indoor localization, and the multi-story indoor localization implementations are still limited. One of the challenges of 3D-indoor localization implementation is the shadowing effect caused by signal propagation obstructed by objects in the room, the walls, and floors between rooms. Some

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van Berlo, Bram, Camiel Oerlemans, Francesca Luigia Marogna, Tanir Ozcelebi, and Nirvana Meratnia. "Mini-Batch Alignment: A Deep-Learning Model for Domain Factor-Independent Feature Extraction for Wi-Fi–CSI Data." Sensors 23, no. 23 (2023): 9534. http://dx.doi.org/10.3390/s23239534.

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Unobtrusive sensing (device-free sensing) aims to embed sensing into our daily lives. This is achievable by re-purposing communication technologies already used in our environments. Wireless Fidelity (Wi-Fi) sensing, using Channel State Information (CSI) measurement data, seems to be a perfect fit for this purpose since Wi-Fi networks are already omnipresent. However, a big challenge in this regard is CSI data being sensitive to ‘domain factors’ such as the position and orientation of a subject performing an activity or gesture. Due to these factors, CSI signal disturbances vary, causing domai

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Hanna, Jessica, Moussa Bteich, Youssef Tawk, et al. "Noninvasive, wearable, and tunable electromagnetic multisensing system for continuous glucose monitoring, mimicking vasculature anatomy." Science Advances 6, no. 24 (2020): eaba5320. http://dx.doi.org/10.1126/sciadv.aba5320.

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Painless, needle-free, and continuous glucose monitoring sensors are needed to enhance the life quality of diabetic patients. To that extent, we propose a first-of-its-kind, highly sensitive, noninvasive continuous glycemic monitoring wearable multisensor system. The proposed sensors are validated on serum, animal tissues, and animal models of diabetes and in a clinical setting. The noninvasive measurement results during human trials reported high correlation (>0.9) between the system’s physical parameters and blood glucose levels, without any time lag. The accurate real-time responses of t

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Kasper, Kevin Albert, Gerardo Figueroa Romero, Dania L. Perez, et al. "Continuous operation of battery-free implants enables advanced fracture recovery monitoring." Science Advances 11, no. 19 (2025). https://doi.org/10.1126/sciadv.adt7488.

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Substantial hurdles in achieving a digitally connected body with seamless, chronic, high-fidelity organ interfaces include challenges of sourcing energy and ensuring reliable connectivity. Operation is currently limited by batteries that occupy large volumes. Wireless, battery-free operation is therefore paramount, requiring a system-level solution that enables seamless connection of wearable and implantable devices. Here, we present a technological framework that enables wireless, battery-free implant operation in freely moving subjects, with streaming of high-fidelity information from low-di

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Shuriji, Mushreq Abdulhussain. "An Extensive Comparison of the Next Generation of Wireless Communication Technology: Light-Fidelity (Li-Fi) Versus Wireless-Fidelity (Wi-Fi)." GSTF Journal on Media & Communications 2, no. 1 (2015). http://dx.doi.org/10.7603/s40874-014-0003-8.

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AbstractWireless communication technology has changed and expanded at an incredible rate particularly within the last few years. Moreover, the demand for wireless communication services has increased due to the fast growth of wireless technology and new revolutionary applications. Nowadays, Wi-Fi is the technology used by most and is widely deployed in homes, offices, coffee shops and airports, etc. It is also widely used with smart phones, tablets and smart TVs, etc. An emerging technology known as Li-Fi is used to off-load data from existing Wi-Fi networks to provide more capacity or where W

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Ali Shah, Syed Farhan, and Muhammad Riaz. "Design of Solar Panels for Light Fidelity (Li-Fi)." International Journal of Sciences and Emerging Technologies 1, no. 2 (2022). http://dx.doi.org/10.56536/ijset.v2i1.9.

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Light-fidelity(Li-Fi) has become a revolutionary technology in this modern era of wireless communication systems. Li-Fi is based on IEEE 802.15.7 standard and having long spectrum with wavelength of the signals ranges from 380 to 780 nm. As bandwidth of the radio electromagnetic spectrum is becoming more saturated and facing shortage which is a very alarming situation for the engineers working in wireless communication technology. This issue can be resolved using Li- Fi instead of wireless-Fidelity (Wi-Fi) for wireless internet. One of the major advantages of Li-Fi is, it has low initial cost

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Faruq, Omar, Kazi Rubaiyat Shahriar Rahman, Nusrat Jahan, Sakib Rokoni, and Mosa Rabeya. "Li-Fi technology based long range free-space communication data transmit system evaluation." International Review of Applied Sciences and Engineering, April 19, 2023. http://dx.doi.org/10.1556/1848.2023.00620.

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AbstractThe most flexible and reliable technological system is Wi-Fi, which is made possible by a wireless connection that transmits data using radio frequencies. Wi-Fi networks, however, encounter numerous issues related to power supply, availability, efficiency, and security as a result of the various access points. While relational waves describe the medical device, Wi-Fi radios produce radio waves that are very dangerous for patients. This document offers line-of-sight communication between the transmitter and receiver using LED technology. Li-Fi technology is a method that transmits audio

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Sun, X., and M. Zhang. "A pragmatic data processing system for large resistive sensor arrays." Review of Scientific Instruments 95, no. 8 (2024). http://dx.doi.org/10.1063/5.0212979.

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Large resistive sensor arrays (RSAs) show great potential in tactile perception. However, the large number of sensors can result in great hardware overhead and bring difficulties for acquiring and processing mass data timely in transient measurement applications. This paper implements a field programmable gate array (FPGA)-based data processing system for a large RSA of 96 × 96, which shows good power consumption and high-speed wireless data update. For crosstalk-free measure, the zero potential method is improved with bus switches, leading to fewer operational amplifiers required and less neg

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Pandi Ravichandran, Venkatesh, and Narmadha Velayudham. "On the performance investigation of a low profile UWB antenna backed with conjointly connected sickle shaped AMC structure for on-/off body communications." Frequenz, April 22, 2025. https://doi.org/10.1515/freq-2024-0204.

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Abstract Enormous growth in wireless communication has led its applicability in various scenarios. One among them is the wireless based on-/off body communication. Achieving this requires compact and efficient antennas for wireless data transfer. To meet this requirement, a low profile Ultra Wideband (UWB) antenna is reported in this work. The antenna’s dimension is 35 × 45 × 0.8 mm3 which is designed using a semi flexible Rogers 5,880 substrate. Using partial ground and asymmetric feed techniques, an ultra-wide bandwidth of 10 GHz (3–13 GHz) is achieved with a good peak gain of 6.7 dB, while

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Genovés, Borja, Javier Talavante, Dayrene Frometa, Muhammad Sarmad Mir, Domenico Giustiniano, and Katia Obraczka. "Towards Sustainable Greenhouses Using Battery-Free LiFi-Enabled Internet of Things." IEEE Communications Magazine, February 14, 2023. https://doi.org/10.5281/zenodo.7640403.

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As the world faces a changing climate, agriculture needs to develop more efficient and sustainable food production systems. Traditional farming methods consume considerable amounts of energy and are largely manually controlled, which leads to sub-optimal production. Greenhouses, which enable yearround crop growth, can play an important role in efficient food production. Leveraging the need for artificial light in greenhouses when the natural sunlight available is not sufficient, we envision that recent progress in Internet of Things (IoT) technology, together with novel Light-Fidelity (LiFi)-b

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Kim, Heesoo, Juhyun Lee, Ung Heo, et al. "Skin preparation–free, stretchable microneedle adhesive patches for reliable electrophysiological sensing and exoskeleton robot control." Science Advances 10, no. 3 (2024). http://dx.doi.org/10.1126/sciadv.adk5260.

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High-fidelity and comfortable recording of electrophysiological (EP) signals with on-the-fly setup is essential for health care and human-machine interfaces (HMIs). Microneedle electrodes allow direct access to the epidermis and eliminate time-consuming skin preparation. However, existing microneedle electrodes lack elasticity and reliability required for robust skin interfacing, thereby making long-term, high-quality EP sensing challenging during body movement. Here, we introduce a stretchable microneedle adhesive patch (SNAP) providing excellent skin penetrability and a robust electromechani

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Stuart, Tucker, Max Farley, Julia Amato, et al. "Biosymbiotic platform for chronic long-range monitoring of biosignals in limited resource settings." Proceedings of the National Academy of Sciences 120, no. 50 (2023). http://dx.doi.org/10.1073/pnas.2307952120.

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Remote patient monitoring is a critical component of digital medicine, and the COVID-19 pandemic has further highlighted its importance. Wearable sensors aimed at noninvasive extraction and transmission of high-fidelity physiological data provide an avenue toward at-home diagnostics and therapeutics; however, the infrastructure requirements for such devices limit their use to areas with well-established connectivity. This accentuates the socioeconomic and geopolitical gap in digital health technology and points toward a need to provide access in areas that have limited resources. Low-power wid

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Zhang, Haoyu, Chaoxu Chen, Fujie Li, et al. "Single‐Pass Wavefront Reconstruction via Depth Heterogeneity Self‐Supervised Neural Operator for Turbulence Correction." Laser & Photonics Reviews, June 22, 2025. https://doi.org/10.1002/lpor.202500909.

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AbstractTurbulence‐induced distortion remains a major bottleneck for high‐fidelity applications such as optical wireless communication and laser‐based remote sensing, as conventional adaptive optics systems struggle to meet the combined demands of bandwidth efficiency, low‐delay and environmental adaptability. Here, a Depth Heterogeneity Self‐supervised Neural Operator (DHSNO) is proposed, a multi‐physics heterogeneous model integrated neural architecture tailored to correct turbulence wavefronts in a single pass without the need for labeled training data. By leveraging dual‐mode intensity det

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Kim, Hodam, Ju Hyeon Kim, Yoon Jae Lee, et al. "Motion artifact–controlled micro–brain sensors between hair follicles for persistent augmented reality brain–computer interfaces." Proceedings of the National Academy of Sciences 122, no. 15 (2025). https://doi.org/10.1073/pnas.2419304122.

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Modern brain–computer interfaces (BCI), utilizing electroencephalograms for bidirectional human–machine communication, face significant limitations from movement-vulnerable rigid sensors, inconsistent skin–electrode impedance, and bulky electronics, diminishing the system’s continuous use and portability. Here, we introduce motion artifact–controlled micro–brain sensors between hair strands, enabling ultralow impedance density on skin contact for long-term usable, persistent BCI with augmented reality (AR). An array of low-profile microstructured electrodes with a highly conductive polymer is

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