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문제 정의
- This paper is devoted to separation of low intensity light VLC channel in case of high influence of “noise” from other illumination sources.
제안 방법
- But in real world RGB LED is recently just a side “noise” light. This paper proposed the noise canceling model to remove the interference of ambient light by using an optical filter for a detachable VLC channel. The goal of proposed system is for multichannel VLC forming based on using optical wavelength filtration, even in condition of high level of light noise from different types of LED.
- This paper proposed the noise canceling model to remove the interference of ambient light by using an optical filter for a detachable VLC channel. The goal of proposed system is for multichannel VLC forming based on using optical wavelength filtration, even in condition of high level of light noise from different types of LED. The proposed model adopts a simple optical filter module of 600nm band for noise removal in the 600nm wavelength band.
- The goal of proposed system is for multichannel VLC forming based on using optical wavelength filtration, even in condition of high level of light noise from different types of LED. The proposed model adopts a simple optical filter module of 600nm band for noise removal in the 600nm wavelength band.
- The transmitter is designed to check the ON/OFF state of the lighting according to the surrounding lighting conditions by controlling the ON/OFF of the LED every one second. The receiver uses the photo resistors equipped with the 600nm band-pass optical filter, It is designed to recognize the brightness and to check the ON/OFF state of the lighting based on the brightness and output it through the serial monitor.
- The results of metering were gain using simple Arduino code in the measuring range from 0 to 1023. All measures were made for all three pre-analyzed light sources with same conditions as spectrogram capturing. High level of illumination dropping was noted after filter passing.
- First, the experiment was carried out indoors, During experiment for transmitting side simple code which turn on and turn of the 3V Epistar LED light with frequency 1000ms was used and other LEDs were constantly turned on “White” light with the highest illumination level.
- In this paper, experiments were conducted in indoor and outdoor to verify the proposed model. First, the experiment was carried out indoors, During experiment for transmitting side simple code which turn on and turn of the 3V Epistar LED light with frequency 1000ms was used and other LEDs were constantly turned on “White” light with the highest illumination level.
- In this paper, we proposed a model that can eliminate the interference of ambient light by applying band-pass optical filter to the problem that noise is generated due to the influence of ambient light in VLC environment using LED lighting. In order to verify the proposed model, we analyze the characteristics of the LED and implement the theoretical verification and actual transmitter and receiver that it is possible to effectively remove the noise in the 600nm band using the characteristics of the LED. Operating with the possibility of filtering wavelength create an opportunities of channel separation on a same light source with different form factor and construction of LED chip.
대상 데이터
- 4]. This maquette consist 2 types of LED, i.e. RGB WS2812 LED and 1W High Power LED (Epistar). One part of the maquette consist full-color RGB patch of 90 LED chips WS2812 which is imitating a typical street advertisement signage.
- RGB WS2812 LED and 1W High Power LED (Epistar). One part of the maquette consist full-color RGB patch of 90 LED chips WS2812 which is imitating a typical street advertisement signage.
성능/효과
- This means almost 45 times more for WS2812. Results of experiment showed that it is possible to receive light signal of blue-yellow phosphor LED through filter even if the illumination of other (RGB) source light is much higher.
- The result of the experiment, confirmed that the data transmitted from the yellow-phosphor LED, which is common used in street lights, can be acquired normally even in the case of an “noise side light” based on RGB LED has much more high illumination level.
후속연구
- Operating with the possibility of filtering wavelength create an opportunities of channel separation on a same light source with different form factor and construction of LED chip. It is expected that this paper will be used as a good research feed for VLC channel allocation in the future as various studies on VLC communication are under way.
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