Research Article
Cooperative NOMA-Based DCO-OFDM VLC System
@INPROCEEDINGS{10.1007/978-3-030-21730-3_2, author={Xin Liu and Yuyao Wang and Zhenyu Na}, title={Cooperative NOMA-Based DCO-OFDM VLC System}, proceedings={Green Energy and Networking. 6th EAI International Conference, GreeNets 2019, Dalian, China, May 4, 2019, Proceedings}, proceedings_a={GREENETS}, year={2019}, month={6}, keywords={Relay NOMA VLC DCO-OFDM}, doi={10.1007/978-3-030-21730-3_2} }- Xin Liu
Yuyao Wang
Zhenyu Na
Year: 2019
Cooperative NOMA-Based DCO-OFDM VLC System
GREENETS
Springer
DOI: 10.1007/978-3-030-21730-3_2
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.