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논문 기본 정보

자료유형
학술저널
저자정보
Seong-Ho Lee (Seoul National University of Science and Technology)
저널정보
한국정보통신학회JICCE Journal of information and communication convergence engineering Journal of information and communication convergence engineering Vol.19 No.4
발행연도
2021.12
수록면
269 - 275 (7page)

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Light-emitting diodes (LEDs) are modulated using a square wave pulse sequence for flicker prevention and dimming control in visible light communication (VLC). In a VLC transmitter, the high and low bits of the non-return-to-zero (NRZ) data are converted to two square waves of different frequencies, which continue for a finite time defined by the fill ratio in an NRZ bit time. As the average optical power was kept constant and independent of data transmission, the LED was flicker-free. Dimming control is carried out by changing the fill ratio of the square wave in the NRZ bit time. In the experiments, the illumination of the LED light was controlled in the range of approximately 19.2% to 96.2% of the continuous square wave modulated LED light. In the VLC receiver, a high-pass filter combined with a latch circuit was used to recover the transmitted signal while preventing noise interference from adjacent lighting lamps.

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Abstract
I. INTRODUCTION
II. PULSE FREQUENCY MODULATION
III. SYSTEM CONFIGURATION
IV. TRANSMISSION EXPERIMENTS
V. DISCUSSION AND CONCLUSIONS
REFERENCES

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