가시광통신 시스템에서 2색 LED를 이용한 잡음광의 영향 감소
Reducing the Effects of Noise Light in a Visible Light Communication System Using Two Color LEDs
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In this paper, we reduced the optical noise interference in a visible light communication system using two color LEDs. In the transmitter, the original and the inverted signals of the transmitted data modulated a red LED and a blue LED, respectively. In the receiver, a differential detector which is composed of two photodetectors and an optical red filter detected the mixed signal radiated from the two LEDs. In an environment that the optical noise from a fluorescent lamp exists, the signal-to-noise ratio in this system was improved by about 20dB compared to that in the conventional system which uses a single LED and a single photodetector.
Abstract
In this paper, we reduced the optical noise interference in a visible light communication system using two color LEDs. In the transmitter, the original and the inverted signals of the transmitted data modulated a red LED and a blue LED, respectively. In the receiver, a differential detector which is composed of two photodetectors and an optical red filter detected the mixed signal radiated from the two LEDs. In an environment that the optical noise from a fluorescent lamp exists, the signal-to-noise ratio in this system was improved by about 20dB compared to that in the conventional system which uses a single LED and a single photodetector.
참고문헌 (6)
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- A. M. Street, "Indoor optical wireless systems-a review", Opt. Quantum Electron, 29, pp.349~378 (1997)
- J. M. Kahn, "Wireless infrared communications", Proc. IEEE, 85(2), pp.265~298 (1997)
- S. -H. Lee, "Reducing the effects of ambient noise light in an indoor optical wireless system using polarizers", Microwave and Optical Technology Letters, 40(3), pp.228~231 (2004)
- 황다현, "가시광 무선인식장치에서 비트간 잡음검출에 의한 잡음광의 영향 감소", 센서학회지, 20(6), pp.412~419 (2011), 한국센서학회