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http://dx.doi.org/10.4218/etrij.15.0114.0105

Bandwidth-Efficient Precoding Scheme with Flicker Mitigation for OFDM-Based Visible Light Communications  

Kim, Byung Wook (School of Electrical and Railway Engineering, Kyungil University)
Jung, Sung-Yoon (Department of Electronic Engineering, Yeungnam University)
Publication Information
ETRI Journal / v.37, no.4, 2015 , pp. 677-684 More about this Journal
Abstract
Recently, orthogonal frequency-division multiplexing (OFDM) was applied to VLC systems owing to its high rate capability. On the other hand, a real-valued unipolar OFDM signal for VLC significantly reduces bandwidth efficiency. For practical implementation, channel estimation is required for data demodulation, which causes a further decrease in spectral efficiency. In addition, the large fluctuation of an OFDM signal results in poor illumination quality, such as chromaticity changes. This paper proposes a spectrally efficient method based on a hidden-pilot-aided precoding technology for VLC with less flickering than a conventional OFDM-based method. This approach can obtain channel information without any loss of bandwidth efficiency while ensuring illumination quality by reducing the flickering effect of an OFDM-based VLC. The simulation results show that the proposed method provides a 6.4% gain in bandwidth efficiency with a 4% reduction in flicker compared to a conventional OFDM-based method.
Keywords
Visible light communication; VLC; orthogonal frequency-division multiplexing; OFDM; bandwidth efficiency; clipping; flickering;
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