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

Title
Bandwidth-Efficient Precoding Scheme with Flicker Mitigation for OFDM-Based Visible Light Communications
Author(s)
정성윤김병욱[김병욱]
Keywords
CLIPPED OPTICAL OFDM; CHANNEL ESTIMATION; FADING CHANNELS; SYSTEMS; NETWORK; SIGNALS; DESIGN
Issue Date
201508
Publisher
ELECTRONICS TELECOMMUNICATIONS RESEARCH INST
Citation
ETRI JOURNAL, v.37, no.4, pp.677 - 684
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.
URI
http://hdl.handle.net/YU.REPOSITORY/31369http://dx.doi.org/10.4218/etrij.15.0114.0105
ISSN
1225-6463
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공과대학 > 전자공학과 > Articles
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