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Faster-than-Nyquist non-orthogonal frequency-division multiplexing for visible light communications

Faster-than-Nyquist non-orthogonal frequency-division multiplexing for visible light communications
Faster-than-Nyquist non-orthogonal frequency-division multiplexing for visible light communications

In this paper, we propose a faster-than-Nyquist (FTN) non-orthogonal frequency-division multiplexing (NOFDM) scheme for visible light communications (VLC) where the multiplexing/demultiplexing employs the inverse fractional cosine transform (IFrCT)/FrCT. Different to the common fractional Fourier transform-based NOFDM (FrFT-NOFDM) signal, FrCTbased 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 bandwidthlimited 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.

Bandwidth, Delays, Faster-than-Nyquist signaling, fractional cosine transform, Frequency division multiplexing, high spectral efficiency, Integrated circuit modeling, non-orthogonal frequency-division multiplexing, OFDM, Optical noise, Transforms, visible light communications
2169-3536
17933-17941
Zhou, Ji
38ea4d39-0217-4cf5-aebf-6ac9aafedfc2
Wang, Qi
91220429-39a1-459a-9dfb-20fb90bfa974
Wei, Jinlong
70c61aa6-1125-4ff9-abbb-b470d7a04c21
Cheng, Qixiang
37be975d-ca9a-41d0-86f3-fd272f12c1ed
Zhang, Tiantian
092e88a6-cbef-4b92-b937-c20ff775cd96
Yang, Zhanyu
c9e867bb-8bd0-4b22-83e4-b09d39554896
Yanga, Aiying
14e5dc7a-3106-4691-b748-e4cc23a614b1
Lu, Yueming
76e942b9-7331-42f8-a6e0-d991f59d5f1b
Qiao, Yaojun
9748f1c0-3100-446d-b3d7-e3db366dab34
Zhou, Ji
38ea4d39-0217-4cf5-aebf-6ac9aafedfc2
Wang, Qi
91220429-39a1-459a-9dfb-20fb90bfa974
Wei, Jinlong
70c61aa6-1125-4ff9-abbb-b470d7a04c21
Cheng, Qixiang
37be975d-ca9a-41d0-86f3-fd272f12c1ed
Zhang, Tiantian
092e88a6-cbef-4b92-b937-c20ff775cd96
Yang, Zhanyu
c9e867bb-8bd0-4b22-83e4-b09d39554896
Yanga, Aiying
14e5dc7a-3106-4691-b748-e4cc23a614b1
Lu, Yueming
76e942b9-7331-42f8-a6e0-d991f59d5f1b
Qiao, Yaojun
9748f1c0-3100-446d-b3d7-e3db366dab34

Zhou, Ji, Wang, Qi, Wei, Jinlong, Cheng, Qixiang, Zhang, Tiantian, Yang, Zhanyu, Yanga, Aiying, Lu, Yueming and Qiao, Yaojun (2018) Faster-than-Nyquist non-orthogonal frequency-division multiplexing for visible light communications. IEEE Access, 6, 17933-17941. (doi:10.1109/ACCESS.2018.2820100).

Record type: Article

Abstract

In this paper, we propose a faster-than-Nyquist (FTN) non-orthogonal frequency-division multiplexing (NOFDM) scheme for visible light communications (VLC) where the multiplexing/demultiplexing employs the inverse fractional cosine transform (IFrCT)/FrCT. Different to the common fractional Fourier transform-based NOFDM (FrFT-NOFDM) signal, FrCTbased 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 bandwidthlimited 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.

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More information

Accepted/In Press date: 24 March 2018
e-pub ahead of print date: 27 March 2018
Keywords: Bandwidth, Delays, Faster-than-Nyquist signaling, fractional cosine transform, Frequency division multiplexing, high spectral efficiency, Integrated circuit modeling, non-orthogonal frequency-division multiplexing, OFDM, Optical noise, Transforms, visible light communications

Identifiers

Local EPrints ID: 419635
URI: http://eprints.soton.ac.uk/id/eprint/419635
ISSN: 2169-3536
PURE UUID: b1eac470-b572-4db5-b1d4-d5f430823339
ORCID for Qi Wang: ORCID iD orcid.org/0000-0003-2645-5807

Catalogue record

Date deposited: 17 Apr 2018 16:30
Last modified: 06 Oct 2020 19:08

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Contributors

Author: Ji Zhou
Author: Qi Wang ORCID iD
Author: Jinlong Wei
Author: Qixiang Cheng
Author: Tiantian Zhang
Author: Zhanyu Yang
Author: Aiying Yanga
Author: Yueming Lu
Author: Yaojun Qiao

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