MPPM based dimming control scheme in visible light communication systems

2019 ◽  
Vol 451 ◽  
pp. 168-173 ◽  
Author(s):  
Keyan Deng ◽  
Yi Wan ◽  
Ying Lu
Keyword(s):  
Visible Light ◽  
Communication Systems ◽  
Visible Light Communication ◽  
Control Scheme ◽  
Dimming Control

Dimming controlled multi header pulse position modulation (MH-PPM) for visible light communication system

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sandip Das ◽  
Soumitra Kumar Mandal
Keyword(s):  
Visible Light ◽  
Data Transmission ◽  
Input Data ◽  
Visible Light Communication ◽  
Experimental Results ◽  
Pulse Position Modulation ◽  
Light Sources ◽  
Error Performance ◽  
Control Scheme ◽  
Dimming Control

Abstract Visible light communication (VLC) has recently drawn more attention due to the existing light sources having a bandwidth that can deliver data transmission at higher bit rates. To maintain desired brightness levels along with reliable data transmission, VLC requires to control dimming levels. In this paper, a dimming control scheme based on pulse position modulation (PPM) is proposed, which constructs a dimming encoded frame per symbol of input data. The scheme utilizes multiple headers, which is selected depending on the dimming levels and the number of bits in a symbol of input data. The proposed scheme for the VLC system supports various dimming levels. The multi header PPM frame generation for input data K = 4 $K=4$ and dimming values α = 0.25, 0.375, and 0.5 is simulated using NI Labview. The proposed dimming scheme has an excellent short-run length property which is well under the maximum flickering time period and is thus capable of flicker mitigation. The slot error performance of the proposed dimming control scheme in a VLC system for varying dimming levels is simulated in Matlab. Simulation results show that the proposed scheme has excellent error performance for a low dimming value of α = 0.25. The experimental results are also carried out in the optisystem considering the practical measured parameters of the indoor environment for free space channel and simulating the VLC system for the proposed scheme. The simulation is carried for different data rates over varying link ranges and the experimental results show that the proposed scheme performs best when dimming value α = 0.25 and data rate 2 Gbps.

scholarly journals Performance of dimming control scheme in visible light communication system

2012 ◽  
Vol 20 (17) ◽  
pp. 18861 ◽  
Author(s):  
Zixiong Wang ◽  
Wen-De Zhong ◽  
Changyuan Yu ◽  
Jian Chen ◽  
Chin Po Shin Francois ◽  
...  
Keyword(s):  
Visible Light ◽  
Communication System ◽  
Visible Light Communication ◽  
Control Scheme ◽  
Dimming Control

scholarly journals Joint Error-Dimming Control Using Constant Weight Coding in Visible Light Communication Systems

2018 ◽  
Vol 173 ◽  
pp. 02019
Author(s):  
Yu Zuo ◽  
Jian Zhang
Keyword(s):  
Visible Light ◽  
Data Transmission ◽  
Communication Systems ◽  
Hamming Distance ◽  
Visible Light Communication ◽  
Reliable Data ◽  
Error Performance ◽  
Constant Weight ◽  
Constant Weight Code ◽  
Dimming Control

To enhance commercial implementation, visible light communication (VLC) should facilitate dimming control and reliable data transmission simultaneously, where users can adjust the brightness levels arbitrarily. Constant weight code (CWC) based dimming method can achieve higher spectral efficiency, but the codewords need further selection to exponentially map the massage. In this paper, based on CWC, we proposed a method to achieve dimming control as well as improve error performance via optimizing the average Hamming distance of the codeword set. Simulation results show that the optimal codeword set can achieve better error performance.

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