Faster-Than-Nyquist Non-Orthogonal Frequency-Division Multiplexing for Visible Light Communications

Ji Zhou; Qi Wang; Jinlong Wei; Qixiang Cheng; Tiantian Zhang; Zhanyu Yang; Aiying Yang; Yueming Lu; Yaojun Qiao

doi:10.1109/ACCESS.2018.2820100

IEEE Access (Jan 2018)

Faster-Than-Nyquist Non-Orthogonal Frequency-Division Multiplexing for Visible Light Communications

Ji Zhou,
Qi Wang,
Jinlong Wei,
Qixiang Cheng,
Tiantian Zhang,
Zhanyu Yang,
Aiying Yang,
Yueming Lu,
Yaojun Qiao

Affiliations

Ji Zhou: ORCiD; Beijing Key Laboratory of Space-Ground Interconnection and Convergence, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, China
Qi Wang: ORCiD; Electronics and Computer Science, University of Southampton, Southampton, U.K.
Jinlong Wei: Huawei DRusseldorf GmbH, European Research Center, München, Germany
Qixiang Cheng: Department of Electrical Engineering, Columbia University, New York, NY, USA
Tiantian Zhang: Beijing Key Laboratory of Space-Ground Interconnection and Convergence, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, China
Zhanyu Yang: Department of Electrical and Computer Engineering, University of Virginia, Charlottesville, VA, USA
Aiying Yang: School of Optoelectronics, Beijing Institute of Technology, Beijing, China
Yueming Lu: Key Laboratory of Trustworthy Distributed Computing and Service, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing, China
Yaojun Qiao: Beijing Key Laboratory of Space-Ground Interconnection and Convergence, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, China

DOI: https://doi.org/10.1109/ACCESS.2018.2820100
Journal volume & issue: Vol. 6
pp. 17933 – 17941

Abstract

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In this paper, we propose a faster-than-Nyquist non-orthogonal frequency-division multiplexing (NOFDM) scheme for visible light communications (VLCs) where the multiplexing/demultiplexing employs the inverse fractional cosine transform (IFrCT)/FrCT. Different to the common fractional Fourier transform-based NOFDM (FrFT-NOFDM) signal, FrCT-based NOFDM (FrCT-NOFDM) signal is real-valued, which can be directly applied to the VLC systems without the expensive up-conversion and thus it is more suitable for the cost-sensitive VLC systems. Under the same transmission rate, FrCT-NOFDM signal occupies smaller bandwidth compared to OFDM signal. When the bandwidth compression factor α is set to 0.8, 20% bandwidth saving can be obtained. Therefore, FrCT-NOFDM has higher spectral efficiency and suffers less high-frequency distortion compared to OFDM, which benefits the bandwidth-limited VLC systems. As the simulation results show, bit error rate performance of FrCT-NOFDM with α of 0.9 or 0.8 is better than that of OFDM. Meanwhile, FrCT-NOFDM has a superior security performance. In conclusion, FrCT-NOFDM shows the potential for application in the future VLC systems.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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