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*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

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 \alpha 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 \alpha 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.

Original languageEnglish
Pages (from-to)17933-17941
Number of pages9
JournalIEEE Access
Volume6
DOIs
Publication statusPublished - 26 Mar 2018

Keywords

  • Faster-Than-Nyquist signaling
  • fractional cosine transform
  • high spectral efficiency
  • non-orthogonal frequency-division multiplexing
  • visible light communications

Fingerprint

Dive into the research topics of 'Faster-Than-Nyquist Non-Orthogonal Frequency-Division Multiplexing for Visible Light Communications'. Together they form a unique fingerprint.

Cite this