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收集所有交通大學研究人員與學生個人或團體所發表之各項學術著作，涵蓋期刊論文、教師專書、學位論文等項。;;Collections of Publications of NCTU Researchers and Students Like Journal Papers and Thesis.

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🏛️國立陽明交通大學機構典藏

Access type: Metadata onlyAuthor: search.filters.author.Liu, Yen-Liang

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Now showing 1 - 4 of 4
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    Demonstration of High Speed Imaging 3x3 MIMO-OFDM Visible Light Communication System
    (2016-01-01)
    Hsu, Chin-Wei
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    Lu, I-Cheng
    ;
    Liu, Yen-Liang
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    Yeh, Chien-Hung
    ;
    Chow, Chi-Wai
    We experimentally demonstrate the 3x3 imaging multiple-input multiple-output (MIMO) visible light communication (VLC) system, using orthogonal frequency division multiplexing (OFDM) modulation and bit-loading, a total data rate > 800-Mbit/s over 1-m transmission is achieved without using blue-filter.
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    Investigation of phosphor-LED lamp for real-time half-duplex wireless VLC system
    (2016-06)
    Yeh, Chien-Hung
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    Chow, Chi-Wai
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    Chen, Hsing-Yu
    ;
    Liu, Yen-Liang
    ;
    Hsu, Dar-Zu
    In this investigation, a 71.3 to 148.4 Mbit s(-1) white phosphor-LED visible light communication (VLC) system is proposed and demonstrated under the practical transmission length of 140 to 210 cm. Here, a commercial white-light LED lamp with five cascaded phosphor-LED chips is utilized for illumination and communication simultaneously. In the measurement, we utilize the optical orthogonal frequency division multiplexing quadrature amplitude modulation (OFDM-QAM) with bit-loading algorithm and propose an optimal bias-tee circuit design to improve the modulation bandwidth from 1 MHz to 27 MHz. Moreover, a blue optical filter is not used on the client side. Finally, to realize and demonstrate the real-time transmission performance in the proposed LED VLC system, a commercial OFDM-based digital signal processor (DSP) chip is utilized on the LED lighting side and client side, respectively. Hence, the proposed real-time half-duplex VLC transmission could achieve the 70 Mbit s(-1) downstream and upstream data throughputs, under a practical transmission length of 200 cm.
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    Adaptive filtering for white-light LED visible light communication
    (2017-01)
    Hsu, Chin-Wei
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    Chen, Guan-Hong
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    Wei, Liang-Yu
    ;
    Chow, Chi-Wai
    ;
    Lu, I-Cheng
    White-light phosphor-based light-emitting diode (LED) can be used to provide lighting and visible light communication (VLC) simultaneously. However, the long relaxation time of phosphor can reduce the modulation bandwidth and limit the VLC data rate. Recent VLC works focus on improving the LED modulation bandwidths. Here, we propose and demonstrate the use of adaptive Volterra filtering (AVF) to increase the data rate of a white-light LED VLC system. The detailed algorithm and implementation of the AVF for the VLC system have been discussed. Using our proposed electrical frontend circuit and the proposed AVF, a significant data rate enhancement to 700.68 Mbit/s is achieved after 1-m free-space transmission using a single white-light phosphor-based LED. (C) 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
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    High-Speed 2x2 MIMO-OFDM Visible Light Communication Employing Phosphorescent LED
    (2016)
    Lu, I-Cheng
    ;
    Liu, Yen-Liang
    ;
    Lai, Chih-Han
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    光電工程學系
    ;
    Department of Photonics
    We experimentally demonstrated a 2x2 multiple-input multiple-output (MIMO) visible light communication (VLC) system using commercial phosphorescent white light emitting diodes (LEDs) and low-cost PIN photodiodes (PDs). Additionally, a pre-equalizer was used to extend the available modulation bandwidth up to 100 MHz. Using spectral-efficient orthogonal frequency division multiplexing (OFDM) modulation with bit-loading algorithm, we successfully achieved high-speed VLC transmission at > 1 Gbit/s over a free-space link of 0.6 m.