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http://dx.doi.org/10.7840/kics.2014.39C.6.476

Performance Improvement for Visible Light Communications Using Pre-Equalizer and Optical Design  

Kwon, Do-Hoon (School of Electrical & Electronic Engineering, Yonsei University)
Yang, Se-Hoon (School of Electrical & Electronic Engineering, Yonsei University)
Kim, Hyun-Seung (School of Electrical & Electronic Engineering, Yonsei University)
Son, Yong-Hwan (School of Electrical & Electronic Engineering, Yonsei University)
Han, Sang-Kook (School of Electrical & Electronic Engineering, Yonsei University)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.39C, no.6, 2014 , pp. 476-481 More about this Journal
Abstract
In this paper, we design the pre-equalizer of transmitter circuit in order to enhancement modulation bandwidth of white LED which is light source of VLC (Visible Light Communication). Also, we eliminate yellow light component by optical filtering which mitigate frequency response of white LED. Power loss by optical filtering is overcome by using convex lens. By applying proposed system, 3 dB bandwidth deciding modulation bandwidth of white LED increases from 3 MHz to more than 25 MHz and the transmission distance increases by optical design which secure additional signal power. We optically modulate NRZ-OOK signal to LED and receive light signal using APD. We analyze received data using CSA and RFSA. As a result, we experimently demonstrate the possibility that transmits NRZ-OOK signal up to 30 Mbps in 4.5 m, 50 Mbps in 1.5 m through the pre-equalizer and optical design.
Keywords
Blue filter; Optical design; Pre-equalizer; Visible Light Communication; White LED;
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