Non-Orthogonal Multiple Access for Visible Light Communications
Non-Orthogonal Multiple Access for Visible Light Communications
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DOI：
10.1109/lpt.2015.2479600
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发表时间：
2016-01-01
影响因子：
2.6
通讯作者：
Muhaidat, Sami
中科院分区：
文献类型：
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作者：
Marshoud, Hanaa;Kapinas, Vasileios M.;Muhaidat, Sami
可见光通信（VLC）的主要局限性是狭窄的调制带宽，可降低可实现的数据速率。在这封信中，我们应用了非正交的多重访问（NOMA）方案来增强高速VLC下行链路网络中可实现的吞吐量。我们首先提出了一种新颖的增益比分配（GRPA）策略，该策略考虑用户的渠道条件以确保有效而公平的功率分配。我们的结果表明，与静态功率分配相比，GRPA显着提高了系统性能。我们还研究调整发光二极管的传输角度和接收器的视野的效果，并证明这些参数可以提供新的自由度来提高NOMA性能。模拟结果表明，NOMA是VLC网络下行链路的有希望的多访问方案。
The main limitation of visible light communication (VLC) is the narrow modulation bandwidth, which reduces the achievable data rates. In this letter, we apply the non-orthogonal multiple access (NOMA) scheme to enhance the achievable throughput in high-rate VLC downlink networks. We first propose a novel gain ratio power allocation (GRPA) strategy that considers the users' channel conditions to ensure efficient and fair power allocation. Our results indicate that the GRPA significantly enhances the system performance compared with the static power allocation. We also study the effect of tuning the transmission angles of the light emitting diodes and the field of views of the receivers, and demonstrate that these parameters can offer new degrees of freedom to boost the NOMA performance. The simulation results reveal that NOMA is a promising multiple access scheme for the downlink of VLC networks.