Modulation and Demodulation Techniques in Indoor Visible Light Communication System

2014 ◽  
Vol 685 ◽  
pp. 306-309
Author(s):  
Hao Wang ◽  
Ze Yu Han
Keyword(s):  
Visible Light ◽  
Communication Technology ◽  
Communication System ◽  
High Speed ◽  
Data Transfer ◽  
Visible Light Communication ◽  
Communication Link ◽  
High Data ◽  
Modulation And Demodulation ◽  
The Impact

Visible light communication technology is a emerging wireless and optical communication technology developed after invention and application of white LED.In this paper, we have a research based on indoor visible light communication system of lighting white LED,discuss of the visible light communication channel characteristics,detailedly analysis of the indoor visible light communication link. This paper focuses on the modulation and demodulation method applied to visible light communication. In the past visible light communication is mainly used off keying modulation,however, the data transfer speed is limited due to the influence of ISI .This paper presents a solution based on OFDM modulation and demodulation, to reduce the impact brought from inter-symbol string under high data transfer speed.Based on data analysis and computer simulation,the program presented in this paper can be used as indoor lighting and high-speed data transmission.Finally, give scheme to achieve visible light communication modulation and demodulation,provide a theoretical basis for further experiments.

scholarly journals Visible Light Communication for Data and Audio Transmission using Light -Fidility (Li-Fi)

2019 ◽  
pp. 534-539
Author(s):  
Z. Asmathunnisa ◽  
S. Manavalan ◽  
N. Kumar
Keyword(s):  
Visible Light ◽  
High Speed ◽  
Nuclear Power ◽  
Power Plants ◽  
Data Transfer ◽  
Visible Light Communication ◽  
Electromagnetic Spectrum ◽  
High Data ◽  
Pass Through ◽  
Very High

LiFi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. LiFi is designed to use LED light bulbs similar to those currently in use in many energy-conscious homes and offices. LiFi data is transmitted by the LED bulbs and received by photoreceptors. Li-Fi technology transmits data at very high speed and is capable of delivering 224GB of data per second. Furthermore, it offers better security as compared to Wi-Fi. Due to its high speed, Li-Fi technology can be widely used in electromagnetic sensitive areas, such as, hospitals, airplanes, and nuclear power plants. Light Fidelity (Li-Fi) is a data transfer technique that uses light. Light is analogous not only to illumination but also to speed. Li-Fi is also much secured since light cannot pass through walls. It uses visible light portion of the electromagnetic spectrum to transmit information. Hence the visible light communication solves the problem of radio frequency congestion. In this project we transmit data and audio through light at very high data rates without use of microcontrollers and its other peripheral devices.

A High-Speed Visible Light Communication System Using Pairs of Micro-size LEDs

2021 ◽  
pp. 1-1
Author(s):  
Shi Zhang ◽  
Zixian Wei ◽  
Zhiyuan Cao ◽  
Keming Ma ◽  
Chien-Ju Chen ◽  
...  
Keyword(s):  
Visible Light ◽  
Communication System ◽  
High Speed ◽  
Visible Light Communication

Researching the Information of Transmission Technology Based on Traffic Lights

2014 ◽  
Vol 644-650 ◽  
pp. 4538-4541
Author(s):  
Qiang Li ◽  
Xin Rui Zhang
Keyword(s):  
Visible Light ◽  
Image Recognition ◽  
Communication Technology ◽  
High Speed ◽  
Visible Light Communication ◽  
Qr Code ◽  
Visible Light Communications ◽  
Traffic Light ◽  
Traffic Lights ◽  
Very High

This design is based on Visible Light Communication Technology, to achieve outdoor visible light communications and image recognition etc. through traffic lights. It will play a role on promoting the utilization of traffic lights. The system uses a LED dot matrix to imitate the traffic light, loading QR Code information on the LED dot matrix and then transporting it in a very high-speed flashing. In receiving terminal, first, webcam OV7670 collects information which from the LED dot matrix, then conveys the picture to FPGA, which is the processor. FPGA will handle the picture by gray scale processing, medium filtering and binary processing at last. Thus, the picture from the LED dot matrix will change to ‘0’ and ‘1’ in binary area. Secondly, as there’s a relationship between LED dot matrix and webcam pixels, we can count how many pixels represent one LED. Finally, we can decode the QR Code based on its own style, and display the final result on the TFT screen.

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.

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