About Digital Communication Methods for Visible Light Communication
Wataru Uemura, Yasuhiro Fukumori, Takato Hayama

TL;DR
This paper proposes two methods for adjusting threshold values in visible light communication systems using pulse wave modulation, enhancing signal detection accuracy through slot counting and signal level measurement, validated by experiments.
Contribution
Introduces two novel threshold adjustment techniques for VLC using pulse position modulation, improving detection reliability without complex amplification.
Findings
Threshold adjustment via slot counting improves signal detection accuracy.
Average signal level measurement aids in optimal threshold setting.
Experimental results confirm the effectiveness of the proposed methods.
Abstract
The visible light communication (VLC) by LED is one of the important communication methods because LED can work as high speed and VLC sends the information by high flushing LED. We use the pulse wave modulation for the VLC with LED because LED can be controlled easily by the microcontroller, which has the digital output pins. At the pulse wave modulation, deciding the high and low voltage by the middle voltage when the receiving signal level is amplified is equal to deciding it by the threshold voltage without amplification. In this paper, we proposed two methods that adjust the threshold value using counting the slot number and measuring the signal level. The number of signal slots is constant per one symbol when we use Pulse Position Modulation (PPM). If the number of received signal slots per one symbol time is less than the theoretical value, that means the threshold value is higher…
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Taxonomy
TopicsOptical Wireless Communication Technologies · Semiconductor Lasers and Optical Devices · Impact of Light on Environment and Health
