Cherntanomwong, Panarat

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Cherntanomwong, Panarat
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panarat.ch@kmitl.ac.th

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    The repeater system for visible light communication
    (2015-01-01)
    Cherntanomwong, Panarat
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    Namonta, Pornchanok
    Visible Light Communication (VLC) Technology is the short range optical wireless communication technology using LEDs for communication and illumination. In this paper, we propose a repeater system for visible light communication to extend the coverage. Our proposed repeater system is composed of hardware and software components. The transmitter converts text data sending from the user into light signal data by using the on-off keying modulation (OOK) technique and transmits this signal via LED. The repeater receives light signal data by photodiode then transmits it out again. With this method, light signal is amplified at each repeater. The receiver converts light signal data back into text data and displays it on user interface for further use. This multi-hop communication gives more flexibility in communication because it helps to increase the distance between transmitter terminal and receiver terminal. Moreover, it also helps to avoid obstacle objects, such as walls, because VLC is a line-of-sight technology.
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    The improvement of repeater system for Visible Light Communication
    (2016-09-06)
    Namonta, Pornchanok
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    Cherntanomwong, Panarat
    Visible Light Communication (VLC) Technology is the short range optical wireless communication technology using LEDs for communication and illumination. In this paper, we propose the improvement of the repeater system for visible light communication. Not just to extend the coverage, but also to transfer file and to increase the communication speed. Our proposed repeater system is composed of hardware and software components. The transmitter opens, splits, and sends a file with RS-232 serial communication interface. The byte data type is converted into light signal data type by using the on-off keying modulation (OOK) technique and is transmitted via LED. The repeater receives light signal data by photodiode then transmits it out again. With this method, light signal is amplified at each repeater. The receiver converts light signal data back into byte data and combines each set of bytes together, then the file can be saved by the user. This multi-hop communication gives more flexibility in communication because it helps to increase the distance between transmitter terminal and receiver terminal. Moreover, it also helps to avoid obstacle objects, such as walls, because VLC is a Line-of-Sight (LOS) technology. This system is improved from our previous system in terms of the number of sending character and the communication speed.
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    Real time vital sign transmission using IEEE 802.15.7 VLC PHY-I transceiver
    (2017-10-19)
    Namonta, Pornchanok
    ;
    Cherntanomwong, Panarat
    Visible Light Communication (VLC) Technology is the short range optical wireless communication technology using the light source such as LEDs for data transmission. The major advantage of VLC is that it causes no interference to RF-based devices and no bad effect to human body. Thus, this makes it possible to be used in intrinsically safe environment such as in a hospital. Moreover, it doesn't have the restriction likes a radio wave, VLC using a license free frequency bands. IEEE 802.15.7 VLC standard is one of the VLC standard. This standard consists of PHY I, II and III operating modes. In this paper, we first focus on analyzing PHY I with OOK modulation, which is targeted towards applications requiring data rate range from 11.67 kb/s to 100 kb/s with 200 kHz optical clock rate. Moreover, we propose the improvement of the real time vital sign transmission based on IEEE 802.15.7 VLC standard using PHY I operating modes for sending the vital signs data, which are temperature and heart rate. Compared with our previous system, there are improvements in many directions. The obvious improvement is the communication speed. Moreover, the transmission range is able to be increased by adding the VLC repeater.