scholarly journals Hybrid RF/visible light communication in downlink wireless system

2018 ◽  
Vol 7 (2.28) ◽  
pp. 272
Author(s):  
Tharindu D. Ponnimbaduge Perera ◽  
Akashkumar Rajaram ◽  
Sangay Chedup ◽  
Dushantha Nalin K. Jayakody ◽  
Bin Chen
Keyword(s):  
Visible Light ◽  
High Speed ◽  
Visible Light Communication ◽  
Symbol Error Rate ◽  
Electrical Signal ◽  
Cooperative System ◽  
Wireless System ◽  
Communication Models ◽  
Rf Communication ◽  
High Speed Data

The spectrum crunch in Radio Frequency (RF) Communication and the prospect of Visible Light Communication (VLC) as an alternative to RF has made way for high speed VLC deployment. The ubiquitous coverage of RF and the high speed data rate achieved with VLC, make the two technologies complimentary to each other, making the hybrid RF/VLC an emerging trend in wireless networks. This study presents a downlink communication of a hybrid RF-VLC, where the signal received through RF channel by a relay is decoded and the symbols are converted into an electrical signals. The electrical signal is fed to an array of LEDs in the relay where data is transmitted in rays of light from LEDs. The hybrid RFVLC system performance is compared with a conventional RF system to understand the performance difference between the two communication models. Thus, the performance of both system models are analysed in terms of Symbol Error Rate and Outage Probability. Numerical results show that the proposed hybrid RF-VLC system is superior to conventional lone RF cooperative system.  

scholarly journals A Signal Amplification-based Transceiver for Visible Light Communication

2020 ◽  
Vol 26 (11) ◽  
pp. 123-132
Author(s):  
Augustus Ehiremen Ibhaze ◽  
Frederick O Edeko ◽  
Patience E Orukpe
Keyword(s):  
Visible Light ◽  
Data Transmission ◽  
High Speed ◽  
Data Transfer ◽  
Visible Light Communication ◽  
Wireless Technology ◽  
Capacity Enhancement ◽  
Large Bandwidth ◽  
High Speed Data ◽  
Speed Data Transmission

Visible light communication (VLC) is an upcoming wireless technology for next-generation communication for high-speed data transmission. It has the potential for capacity enhancement due to its characteristic large bandwidth. Concerning signal processing and suitable transceiver design for the VLC application, an amplification-based optical transceiver is proposed in this article. The transmitter consists of a driver and laser diode as the light source, while the receiver contains a photodiode and signal amplifying circuit. The design model is proposed for its simplicity in replacing the trans-impedance and transconductance circuits of the conventional modules by a simple amplification circuit and interface converter. The system was tested at communication distances of 1m and 3.5m using a terminal emulation program for data transfer between two computing devices.

scholarly journals Vehicle Collision Avoidance System Using Li-Fi

2021 ◽  
Author(s):  
P.M. Benson Mansingh ◽  
G. Sekar ◽  
T. Joby Titus
Keyword(s):  
Visible Light ◽  
Communication System ◽  
High Speed ◽  
Visible Light Communication ◽  
Data Rate ◽  
Road Accidents ◽  
Daily Lives ◽  
Vehicle Collision ◽  
The World ◽  
High Speed Data

In recent times, large numbers of road accidents occurring all over the world are mainly due to collisions between vehicles. More than 1.2 million peoples were died in road accidents in 2019, according to the World Health Organization (WHO). Human safety features are much needed in the manufacturing of vehicles. The proposed method mainly focuses on reducing the number of accidents in our daily lives by avoiding collision between the vehicles. There are several factors corresponding to such difficult conditions that may results in death or disabilities. The causes are sudden loss of concentration of the driver, braking failure and stability issues. These criteria can be reduced only if there is a possibility for communication between the vehicles and the drivers in order to avoid accidents. There are various vehicular communication system models like Dedicated Short Range Communication and Vehicular Ad-Hoc network operating less than 5.9 GHz. These radio frequency based communication also has some limitations such as interference, congested spectrum and security. These drawbacks can be reduced by implementing the Visible Light Communication (VLC) in vehicles. It provides larger bandwidth, security, interference immunity, and high data rate. High speed data transmission and reception can be achieved using visible light based data communication system. This technology is known as Light Fidelity (Li-Fi). This chapter presents the innovative method to evade collision between two vehicles (rear and front). This communication system is cost effective with high speed data rate capabilities.

scholarly journals Home Automation System using Li-Fi Technology

2020 ◽  
Vol 8 (6) ◽  
pp. 5148-5152
Keyword(s):  
Data Transmission ◽  
High Speed ◽  
Visible Light Communication ◽  
Electrical Signal ◽  
Automation System ◽  
Optical Carrier ◽  
Light Emitting ◽  
High Speed Data ◽  
Home Automation System ◽  
Speed Data Transmission

Light fidelity is a upcoming technology for high speed data transmission and controlling home appliances. Visible light communication is the technology used in Li-Fi that uses Light emitting diodes. The evolution of Li-fi is to overcome the rate of speed and security in Wi-Fi. The photo diode in this will convert the flashes into electrical signal and it is amplified to provide output. The optical carrier for data transmission is between 400 THZ and 800THZ.The main advantage of Li-Fi is high density, high speed and high accuracy.

scholarly journals Organic solar cells as high-speed data detectors for visible light communication

Optica ◽  
2015 ◽  
Vol 2 (7) ◽  
pp. 607 ◽  
Author(s):  
Shuyu Zhang ◽  
Dobroslav Tsonev ◽  
Stefan Videv ◽  
Sanjay Ghosh ◽  
Graham A. Turnbull ◽  
...  
Keyword(s):  
Solar Cells ◽  
Visible Light ◽  
Organic Solar Cells ◽  
High Speed ◽  
Visible Light Communication ◽  
High Speed Data

scholarly journals Visible Light Communication: A System Perspective—Overview and Challenges

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1153 ◽  
Author(s):  
Saeed Rehman ◽  
Shakir Ullah ◽  
Peter Chong ◽  
Sira Yongchareon ◽  
Dan Komosny
Keyword(s):  
Energy Efficiency ◽  
Visible Light ◽  
High Speed ◽  
Data Communication ◽  
Visible Light Communication ◽  
Communication Security ◽  
Light Spectrum ◽  
New Paradigm ◽  
System Perspective ◽  
High Speed Data

Visible light communication (VLC) is a new paradigm that could revolutionise the future of wireless communication. In VLC, information is transmitted through modulating the visible light spectrum (400–700 nm) that is used for illumination. Analytical and experimental work has shown the potential of VLC to provide high-speed data communication with the added advantage of improved energy efficiency and communication security/privacy. VLC is still in the early phase of research. There are fewer review articles published on this topic mostly addressing the physical layer research. Unlike other reviews, this article gives a system prespective of VLC along with the survey on existing literature and potential challenges toward the implementation and integration of VLC.

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