Browsing by Author "Chen, Zhen-Yu"

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3.22-Gb/s WDM Visible Light Communication of a Single RGB LED Employing Carrier-Less Amplitude and Phase Modulation
(2013)
Wu, Fang-Ming
;
Lin, Chun-Ting
;
Wei, Chia-Chien
;
Chen, Cheng-Wei
;
Chen, Zhen-Yu
We experimentally demonstrate WDM-VLC employing CAP modulation and commercially available RGB-type LED. The record aggregate data rate of 3.22 Gb/s with the BER of less than 10(-3) is successfully achieved over >25-cm air-transmission.
Indoor VLC System With Multiple LEDs of Different Path Lengths Employing Space-Time Block-Coded DMT/CAP Modulation
(2015-03-01)
Wei, Chia-Chien
;
Wu, Fang-Ming
;
Chen, Zhen-Yu
;
Lin, Chun-Ting
;
Huang, Yu-Syuan
We experimentally demonstrate a practical visible light communication (VLC) system of 3.2-m transmission using spectrally efficient discrete multitone (DMT) or carrierless amplitude phase (CAP) modulation. The transmitters consist of two light emitting diodes (LEDs) spaced 2 m apart, the arrangement of which corresponds to a common case for full-range illumination in indoor environments, and this work also investigates the influence of the difference in transmission path lengths from the LEDs to a single receiver. In the overlapped illumination area, the delay interference between the LEDs could result in up to about 40% capacity reduction using quaternary CAP or bit-loaded DMT signals, when two LEDs simply transmit the same signal. To mitigate the impact of the delay interference, Alamouti space-time block coding (STBC) is employed for both DMT and CAP signals, and the combination of CAP and STBC is proposed for the first time to the authors\' best knowledge. Employing STBC, we successfully demonstrate interference-tolerant VLC over 3.2-m air transmission, and the maximum data rates for DMT and CAP signals are 220 and 150 Mbps, respectively.
LED-based Visible Light Communication in a Practical Indoor Interfered Environment Employing DMT and STBC
(2014-01-01)
Wei, Chia-Chien
;
Wu, Fang-Ming
;
Chen, Zhen-Yu
;
Lin, Chun-Ting
;
Chen, Yung-Jui
We demonstrate practical indoor VLC of 3.2-m transmission, and investigate multipath interference between LEDs. Employing repetition coding, 161 similar to 266-Mbps DMT-signals are achieved depending on interference severity. Employing STBC, about fixed 220-Mbps data rate could be achieved.