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🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Liu, YangSubject: search.filters.subject.Visible light communication (VLC)

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Now showing 1 - 5 of 5
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    2.333-Tbit/s bi-directional optical mobile networks using optical wireless communication (OWC)
    (2020-11-15)
    Wei, Liang-Yu
    ;
    Chen, Shu-, I
    ;
    Yeh, Chien-Hung
    ;
    Liu, Yang
    ;
    Chen, Guan-Hong
    We propose and experimentally demonstrate a 2.333-Tbit/s bi-directional optical mobile network using optical wireless communication (OWC). The proposed network architecture is divided into: fronthaul network con-necting between the distributed-unit (DU) and the remote-radio-unit (RRU); and midhaul network connecting between the central unit (CU) and the DU. At the midhaul, an aggregated 2.333-Tbit/s transmission is achieved using wavelength division multiplexed (WDM) infrared (IR) based invisible light communication (IVLC). For the link between the RRU and user-equipment (UE), 2.7 Gbit/s white-light visible-light-communication (VLC) transmission is achieved for indoor 1.5 m transmission. It can provide communication and lighting simultaneously. A gateway (GW) is also proposed acting as the interface between the IVLC and VLC transmissions. In the proposed architecture, about 400 VLC end-users can be supported.
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    Analysis of Non-Hermitian symmetry (NHS) IFFT/FFT size efficient OFDM for multiple-client non-orthogonal multiple access (NOMA) visible light communication (VLC) system
    (2020-10-01)
    Adnan, Assaidah
    ;
    Liu, Yang
    ;
    Chow, Chi-Wai
    ;
    Yeh, Chien-Hung
    ;
    交大名義發表
    Orthogonal-frequency-division-multiplexing (OFDM) format is widely deployed in visible-light-communication (VLC) systems due to its high spectral efficiency. To produce real-valued OFDM signal for VLC, Hermitian-symmetry (HS) is needed during the inverse-fast-Fourier-transform (IFFT) encoding process. However the HS requirement doubles the IFFT/FFT size and increase the encoding complexity. Non-Hermitian symmetry (NHS)-OFDM schemes are proposed, but they have different limitations. In this work, we propose and investigate a non-orthogonal multiple access (NOMA) VLC network serving 2, 3 or 4 clients simultaneously using NHS-OFDM IFFT/FFT size efficient (SE) OFDM format. Numerical analysis of signal amplitude effect to the bit-error-ratio (BER) performance for different users are performed, showing that the BER < 7% forward-error-correction (FEC) limit can be achieved as long as the required signal amplitude ratio of each user is fulfilled. We also compare the proposed system with a typical example of HS-OFDM modulation, i.e. direct-current optical (DCO)-OFDM NOMA-VLC system.
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    Visible Light Encryption System Using Camera Image Sensor
    (2016)
    Hsu, Chin-Wei
    ;
    Liang, Kevin
    ;
    Chen, Hung-Yu
    ;
    Wei, Liang-Yu
    ;
    Yeh, Chien-Hung
    We propose and experimentally demonstrate a light encryption scheme using camera image sensor. Besides, rolling-shutter effect of the CMOS camera in the mobile-phone can be used to enhance the data rate of transmission.
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    Orthogonal frequency-division multiplexing access (OFDMA) based wireless visible light communication (VLC) system
    (2015-11-15)
    Sung, Jiun-Yu
    ;
    Yeh, Chien-Hung
    ;
    Chow, Chi-Wai
    ;
    Lin, Wan-Feng
    ;
    Liu, Yang
    An orthogonal frequency-division multiplexing access (OFDMA) based visible light communication (VLC) system is proposed in this paper. The architecture of the proposed system is divided into several VLC cells, which is defined in this paper. The deployment and upgrade of the system involve only simple combination of the VLC cells. Hence it is economically advantageous. To guarantee smooth communication, nearly equal data rate is provided at every location within the system with no concern on the system scale. The user location monitor strategy is also discussed to solve the region division issues. The characteristics of the proposed system are analyzed in detail in this paper. A one-dimensional experiment was demonstrated with 13.6 Mb/s data rate. (C) 2015 Elsevier B.V. All rights reserved.
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    Secure communication zone for white-light LED visible light communication
    (2015-06-01)
    Chow, Chi-Wai
    ;
    Liu, Yang
    ;
    Yeh, Chien-Hung
    ;
    Chen, Chung-Yen
    ;
    Lin, Chao-Nan
    As visible light communication (VLC) can be one of the promising wireless communication technologies in the future, improving the transmission security in VLC is highly desirable. We propose and demonstrate a secure VLC system using data superposition of different light emitting diodes (LEDs). The eavesdroppers can receive similar illumination but cannot obtain enough signal-to-noise ratio (SNR) for communication. The channel model and simulation parameters are presented. Analysis of the secure VLC zone forming using practical in-home scenarios is also discussed, showing the flexibly control the size and shift of secure VLC zone. A proof-of-concept experiment is performed, and there is a good match in trend between the experimental and simulation results. (C) 2015 Elsevier B.V. All rights reserved.