TY - JOUR
T1 - Faster-Than-Nyquist Non-Orthogonal Frequency-Division Multiplexing for Visible Light Communications
AU - Zhou, Ji
AU - Wang, Qi
AU - Wei, Jinlong
AU - Cheng, Qixiang
AU - Zhang, Tiantian
AU - Yang, Zhanyu
AU - Yang, Aiying
AU - Lu, Yueming
AU - Qiao, Yaojun
N1 - Publisher Copyright:
© 2013 IEEE.
PY - 2018/3/26
Y1 - 2018/3/26
N2 - 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.
AB - 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.
KW - Faster-Than-Nyquist signaling
KW - fractional cosine transform
KW - high spectral efficiency
KW - non-orthogonal frequency-division multiplexing
KW - visible light communications
UR - http://www.scopus.com/inward/record.url?scp=85044848421&partnerID=8YFLogxK
U2 - 10.1109/ACCESS.2018.2820100
DO - 10.1109/ACCESS.2018.2820100
M3 - Article
AN - SCOPUS:85044848421
SN - 2169-3536
VL - 6
SP - 17933
EP - 17941
JO - IEEE Access
JF - IEEE Access
ER -