Abstract
In this paper, relaying technique and non-orthogonal multiple access (NOMA) are adopted to improve performance of visible light communication (VLC) system. Due to the adoption of relay terminal, the link reliability and communication coverage of VLC system are boosted. Besides, the utilization of NOMA can greatly increase spectral efficiency and support massive connectivity. So, a cooperative NOMA-based DCO-OFDM VLC system is proposed. All the optical transmission links use DCO-OFDM to accomplish information transmission. The relay terminal in the proposed system not only forwards the source signal but also sends its own signal simultaneously. The signals over the links between relay and two users are superposed based on NOMA. Under different cases, the total throughput is analyzed and the optimal power allocation factor is obtained. In addition, the OMA-based system is taken as the benchmark system. The simulation results further verify the theoretical results and the superiority that the proposed system has.
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Acknowledgements
This work was supported by the National Natural Science Foundations of China under Grant 61601221, the Joint Foundations of the National Natural Science Foundations of China and the Civil Aviation of China under Grant U1833102, and the China Postdoctoral Science Foundations under Grants 2015M580425 and 2018T110496.
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© 2019 ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering
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Liu, X., Wang, Y., Na, Z. (2019). Cooperative NOMA-Based DCO-OFDM VLC System. In: Jin, J., Li, P., Fan, L. (eds) Green Energy and Networking. GreeNets 2019. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, vol 282. Springer, Cham. https://doi.org/10.1007/978-3-030-21730-3_2
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DOI: https://doi.org/10.1007/978-3-030-21730-3_2
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