Research of LED Emission Cross-Section on Light Communication Systems

2014 ◽  
Vol 602-605 ◽  
pp. 3039-3042
Author(s):  
Wei Min Qi ◽  
Jie Xiao
Keyword(s):  
Visible Light ◽  
Cross Section ◽  
Power Distribution ◽  
Communication Systems ◽  
Emission Cross Section ◽  
Optical Power ◽  
Visible Light Communication ◽  
Communication Performance ◽  
Light Emitting ◽  
Communication Source

Visible light communication (VLC) is an optical wireless communication technology that uses visible light emitting diodes (LEDs) as a communication source. Since the LEDs are also used for illumination, the cross-section emission effects of the LEDs need to be analyzed as they apply to indoor VLC channels. In order to evaluate the illumination and communication performance according to the emission cross-section pattern, a simple LED model with a quasi-elliptic emission cross-section is proposed and compared to a circular LED model. The LEDs with a quasi-elliptic emission cross-section provide less fluctuation in the illumination and optical power distribution at the receiving plane. The four-transmitter VLC system is found to support at least at 30 and 33 Mb/s for circular and quasi-elliptic emission cross-section LEDs for the entire receiving plane, respectively.

scholarly journals Effect of LED emission cross-section in indoor visible light communication systems

2012 ◽  
Vol 2012 (1) ◽  
Author(s):  
Huy Quang Nguyen ◽  
Joon-Ho Choi ◽  
Tae-Gyu Kang ◽  
Sang-Kyu Lim ◽  
Dae Ho Kim ◽  
...  
Keyword(s):  
Visible Light ◽  
Cross Section ◽  
Communication Systems ◽  
Emission Cross Section ◽  
Visible Light Communication

scholarly journals Energy-Efficient Optimization Design for the Multi-Color LED Based Visible Light Communication Systems under Illumination Constraints

2018 ◽  
Vol 9 (1) ◽  
pp. 1 ◽  
Author(s):  
Yu Zuo ◽  
Jian Zhang
Keyword(s):  
Energy Consumption ◽  
Visible Light ◽  
Power Allocation ◽  
Communication Systems ◽  
Optimization Design ◽  
Optical Power ◽  
Visible Light Communication ◽  
Visible Light Communications ◽  
Allocation Scheme ◽  
High Modulation

Visible light communications (VLCs) utilizing multi-color light-emitting diodes (LEDs) can achieve a high modulation bandwidth and high-quality illumination compared with phosphor-converted LEDs, which have attracted much attention. However, the spectrum overlapping of different colors may cause the crosstalk problem, which should be considered in the practical multi-color LED-based VLC systems. Due to the ever-increasing energy consumption, the interest in an energy-saving communication technique has further increased. In this paper, in order to maximize energy efficiency, an optimization problem of the optical power allocation scheme is formulated for the multi-color LED-based VLC systems under the necessary communication requirements and illumination constraints with luminance, chromaticity, and signal to interference plus noise ratio (SINR) constraints. Simulation results indicate that the proposed optimal power allocation scheme can reduce energy consumption while satisfying the illumination and communication requirements.

scholarly journals Implementasi Visible Light Communication (VLC) Pada Sistem Komunikasi

2017 ◽  
Vol 1 (1) ◽  
pp. 13
Author(s):  
ARSYAD RAMADHAN DARLIS ◽  
LITA LIDYAWATI ◽  
DECY NATALIANA
Keyword(s):  
Solar Cell ◽  
Visible Light ◽  
Communication System ◽  
Communication Systems ◽  
Light Emitting Diode ◽  
Bright Light ◽  
Visible Light Communication ◽  
Light Emitting ◽  
Transmission Distance ◽  
The Many

ABSTRAKPerkembangan teknologi telah menunjukkan peningkatan yang cukup signifikan, terutama untuk bidang komunikasi. Hal ini terbukti dengan banyaknya media komunikasi baik itu nirkabel dan kabel. Pada penelitian ini dimanfaatkan cahaya tampak sebagai media dalam sistem komunikasi, dimana selama ini cahaya hanya digunakan sebagai penerangan saja. Visible Light Communication (VLC) adalah sebuah teknologi komunikasi yang memanfaatkan pancaran cahaya tampak dari lampu pada sistem komunikasi. Sistem komunikasi visible light ini terdiri dari pemancar dan penerima. Pemancar terdiri dari Light Emitting Dioda, audio transformator dan baterai, dan pada penerima terdiri dari solar cell dan photodioda, amplifier dan catu daya. Hal-hal yang dapat mempengaruhi hasil output sistem komunikasi adalah jarak, terang cahaya lampu pemancar dan cahaya luar. Pada penelitian ini, komunikasi menggunakan VLC dapat dilakukan pada jarak pengiriman data sebesar 2,5 m dan dengan range frekuensi 600 Hz sampai dengan 45 kHz dimana data dapat disalurkan dengan baik.Kata kunci: Visible light, Sistem komunikasi, Light Emitting Dioda, solar cell, photodioda.ABSTRACTTechnological developments have shown a significant increase, especially in the field of communication. This is proved by the many communications media using both wireless and wired. This study utilized the visible light as a medium of communication system, which has been used as an illumination light only. Visible Light Communication (VLC) is a communication technology which utilize visible light emitted from the lamp in the communication system. The visible light communication system consists of a transmitter and receiver. The transmitter consists of a Light Emitting Diode, audio transformer and battery, and the receiver consists of a solar cell and a photodiode, amplifier and power supply. Things that can affect the output of the communication system is the distance, bright light and outdoor light. In the research, the results that obtained from this study is the data transmission distance of 2.5 m and a frequency range of 600 Hz to 45 kHz data can be routed properly.Keywords:  Visible light, Communication systems, Light Emitting Dioda, solar cell, photodioda.

scholarly journals Multi-User Precoder Designs for RGB Visible Light Communication Systems

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6836
Author(s):  
Roser Viñals ◽  
Olga Muñoz ◽  
Adrián Agustín ◽  
Josep Vidal
Keyword(s):  
Visible Light ◽  
White Light ◽  
Communication Systems ◽  
Light Emitting Diodes ◽  
Light Emission ◽  
Light Emitting Diode ◽  
Pulse Amplitude ◽  
Visible Light Communication ◽  
Light Emitting ◽  
Weighted Sum Rate

In this paper, we design linear precoders for the downlink of a visible light communication (VLC) system that simultaneously serves multiple users. Instead of using phosphor-coated white light-emitting diodes (PWLEDs), we focus on Red-Green-Blue light-emitting diodes (RGB-LEDs) that allow modulating three separate data streams on the three primary colors of the RGB-LEDs. For this system, we design a zero-forcing (ZF) precoder that maximizes the weighted sum rate for a multilevel pulse amplitude modulation (M-PAM). The precoding design in RGB-based systems presents some challenges due to the system constraints, such as the limited power, the non-negative amplitude constraints per light-emitting diode (LED), and the need to guarantee white light emission while transmitting with RGB-LEDs. For comparison purposes, we also consider the ZF design for a PWLED-based system and evaluate the performance of both a PWLED- and an RGB-based system.

scholarly journals Performance of Outdoor Lamp Implementation for Visible Light Communication under Ambient Environment

2018 ◽  
Author(s):  
Ronaldo Soritua Sitanggang ◽  
Denny Darlis ◽  
Karina Wahyu Noviyanti
Keyword(s):  
Light Intensity ◽  
Visible Light ◽  
Communication Systems ◽  
Optical Power ◽  
Visible Light Communication ◽  
Digital Data ◽  
Maximum Distance ◽  
Optimal Distance ◽  
Types Of Information ◽  
Incandescent Lamps

This article is preprint for ASAIS 2018 - Visible Light Communication is the name given to wireless communication systems that convey information by modulating visible light by the human eye. Interest in the field of VLC has grown rapidly along with the development of LEDs as a source of lighting. The motivation is clear: If the room is lit by an LED, why not use it further for the communication provider, along with the lighting facilities at the same time? At the sending side, VLC technology uses LED lighting lamps which are currently very popular to replace incandescent lamps and TL (Fluorescent Lamp) lamps. Visible light communication has many advantages, including security, speed, and convenience to be applied to users to send various types of information including digital data such as text and images. Several studies have been conducted previously regarding the application of information delivery systems using VLC such as sending voice, digital data, images, and video. However, it has not been clearly stated the influence of various lighting lamps used on the system mentioned above such as electrical and optical power used, the angle of transmission and optimal distance with the influence of environmental conditions that cause information transmission losses. Data that can be sent well use yard lighting with a maximum distance of 130 cm with 15 lx light intensity, street lighting with a maximum distance of 400 cm with 6 lx light intensity, and vehicle lights with a maximum distance of 270 cm with 12 lx light intensity.

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