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學術出版;;Publications

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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

Has files: YesSubject: search.filters.subject.Light emitting diode (LED)

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    Beacon Jointed Packet Reconstruction Scheme for Mobile-Phone Based Visible Light Communications Using Rolling Shutter
    (2017-12-01)
    Wang, Wei-Chung
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    Chow, Chi-Wai
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    Chen, Chia-Wei
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    Hsieh, Hsiang-Chain
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    Chen, Yen-Ting
    Mobile-phone based visible light communication (VLC) is an attractive method for optical wireless communication. However, the data rate is typically limited by the complementary metal-oxide-semiconductor image sensor frame rate and the processing time gap in the rolling shutter mode operation. Here, we propose and demonstrate a packet-reconstruction scheme, known as beacon jointed rolling shutter pattern scheme. The mobile-phone based VLC data rate can be increased to a record 10.32 kb/s. The implementation algorithm is discussed; and the bit-error-rate experimental evaluations at different transmission distances and horizontal offsets are performed.
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    Demonstration of Using Digital FIR Filter and Matched Filter to Increase Data Rate in Visible Light Communication
    (2013)
    Liu, Yu-Feng
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    Yeh, Chien-Hung
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    Chow, Chi-Wai
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    Huang, Po-Yen
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    Liu, Yang
    Using digital-filters in time domain are demonstrated to enhance the modulation-speed of 1 MHz bandwidth white LED communication. Digital FIR filter and matched filtering are used to reduce the inter-symbol-interference (ISI). Hence, 20-Mbps is achieved by using 4-ASK modulation.
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    QPSK Modulation for AC-Power-Signal-Biased Visible Light Communication System
    (2013)
    Liu, Yu-Feng
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    Yeh, Chien-Hung
    ;
    Chow, Chi-Wai
    ;
    Liu, Yang
    ;
    光電工程學系
    With the integration of light emitting diode (LED), visible light communication (VLC) can provide wireless communication link using the lightning system. Due to the consideration of power efficiency, AC-LED has the design of reducing energy waste with alternating current from the power outlet. In this work, we propose an AC-power-signal-biased system that provides communication on both DC-LED and AC-LED. The bias circuit is designed to combine AC-power signal and the message signal with QPSK format. This driving scheme needs no AC-to-DC converters and it is suitable for driving AC LED. Synchronization is completed to avoid threshold effect of LED.