期刊论文详细信息
IEEE Access
Faster-Than-Nyquist Non-Orthogonal Frequency-Division Multiplexing for Visible Light Communications
Ji Zhou1  Zhanyu Yang1  Tiantian Zhang2  Aiying Yang3  Qi Wang4  Jinlong Wei5  Yaojun Qiao6  Yueming Lu7  Qixiang Cheng8 
[1] Beijing Key Laboratory of Space-Ground Interconnection and Convergence, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, China;Department of Electrical Engineering, Columbia University, New York, NY, USA;Department of Electrical and Computer Engineering, University of Virginia, Charlottesville, VA, USA;Electronics and Computer Science, University of Southampton, Southampton, U.K.;Huawei DRusseldorf GmbH, European Research Center, M&x00FC;Key Laboratory of Trustworthy Distributed Computing and Service, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing, China;School of Optoelectronics, Beijing Institute of Technology, Beijing, China;nchen, Germany;
关键词: Faster-than-Nyquist signaling;    non-orthogonal frequency-division multiplexing;    fractional cosine transform;    high spectral efficiency;    visible light communications;   
DOI  :  10.1109/ACCESS.2018.2820100
来源: DOAJ
【 摘 要 】

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.

【 授权许可】

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