scholarly journals A Hybrid Modulation Method for Dimming in Visible Light Communication

2018 ◽  
Author(s):  
Wataru Uemura ◽  
Takahiro Kitazawa
Keyword(s):  
Visible Light ◽  
Visible Light Communication ◽  
Modulation Method ◽  
Hybrid Modulation

scholarly journals 5G Visible Light Communication - OCDMA Setup using Catenated-OFDM Modulation Method

2021 ◽  
Vol 1755 (1) ◽  
pp. 012016
Author(s):  
N. M. Nawawi ◽  
S. R. Abdullah ◽  
Aini Syuhada Md Zain ◽  
M. S. Anuar ◽  
M. N. Junita
Keyword(s):  
Visible Light ◽  
Visible Light Communication ◽  
Modulation Method ◽  
Ofdm Modulation

scholarly journals Research and Prospect on Key Technologies of Indoor Positioning Based on Visible Light Communication

2022 ◽  
Vol 2160 (1) ◽  
pp. 012074
Author(s):  
Yong Cao ◽  
Yifan Zheng ◽  
Xiao Wang ◽  
Yanbo Liu ◽  
Yi Liu
Keyword(s):  
Visible Light ◽  
High Precision ◽  
Electromagnetic Interference ◽  
Visible Light Communication ◽  
Indoor Positioning ◽  
Modulation Method ◽  
Positioning System ◽  
White Led ◽  
Wireless Positioning ◽  
Modulation Methods

Abstract Indoor positioning has become a research hotspot because of its important application value in industrial production and daily life. Traditional wireless positioning technologies such as Wi Fi and Bluetooth are difficult to achieve high-precision indoor positioning due to electromagnetic interference and multipath effect. The modulated white LED can not only meet the needs of lighting, but also transmit the location information to achieve high-precision indoor positioning. This paper first introduces several modulation methods commonly used in visible light positioning system, compares the characteristics of different modulation methods, and proposes a modulation method suitable for visible light positioning; Then, two demodulation methods of the visible light positioning system are introduced and discussed; After that, several visible light location algorithms are introduced, and the performance of each algorithm is analyzed in detail; Finally, the problems in visible light positioning are discussed and prospected.

Hybrid modulation scheme for Visible Light Communication using CMOS camera

2019 ◽  
Vol 440 ◽  
pp. 89-94 ◽  
Author(s):  
Yiqin Xu ◽  
Zhitao Chen ◽  
Zheng Gong ◽  
Zhifeng Xia ◽  
Tao Yuan ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Communication ◽  
Modulation Scheme ◽  
Cmos Camera ◽  
Hybrid Modulation

scholarly journals Dimming Techniques for Visible Light Communication System

2018 ◽  
Vol 10 (1) ◽  
pp. 258
Author(s):  
Suriza A.Z. ◽  
Sharmin Akter ◽  
M. Shahnan
Keyword(s):  
Visible Light ◽  
Communication System ◽  
Light Emitting Diode ◽  
New Technology ◽  
Visible Light Communication ◽  
Modulation Method ◽  
Transmission Distance ◽  
Modulation Techniques ◽  
Dimming Control ◽  
Future Work

<p class="thesis-abstract">Visible light communication (VLC) is an emerging and promising new technology in optical wireless communication (OWC). However, dimming has an adverse effect on the performance of visible light communication system. In visible light communication (VLC) system, illumination and communication both are provided simultaneously using a light emitting diode (LED). The specification for lighting is application specific for which dimming control is required. There are different modulation techniques for dimming control in visible light communication. In this thesis, NRZ-OOK modulation method and 4-QAM-OFDM modulation techniques are investigated for different dimming range, transmission distance, beam divergence angle and bit rate. The result shows that for 13m link range, 5Gb/s data speed is achievable for the 4-QAM-OFDM scheme. The analysis of this research is executed only based on system parameters. The scope of this research excluded the following parameters which are shadowing, mobility, multipath interference and inter-symbol interference for multicarrier modulation. These are the related research topic which can be investigated for future work.</p>

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