Phase-Aligned Physical-Layer Network Coding in Visible Light Communications
Phase-Aligned Physical-Layer Network Coding in Visible Light Communications
复制标题
可见光通信中的相位对齐物理层网络编码
DOI：
10.1109/jphot.2019.2904954
复制
发表时间：
2019-04
影响因子：
2.4
通讯作者：
Chan Calvin Chun Kit
中科院分区：
文献类型：
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作者：
Guan Xun;Yang Qing;Wang Taotao;Chan Calvin Chun Kit
在可见光通信(VLC)中部署中继节点，缓解了对视距传输的要求，从而扩展了VLC系统的服务覆盖范围。在本文中，我们提出在VLC系统中使用物理层网络编码(PNC)，通过提高中继节点的数据传输来提高系统的吞吐量。我们设计了一个统一的PNC-VLC框架，包括物理层信号处理算法和媒体访问控制方法。为了进一步提高可行性，我们提出了一种新的相位对准方法来对抗实际VLC系统中节点之间的相位偏移。实验结果表明，该框架的吞吐量提高了88.23%，在误码率为3.8W×10−3时，采用相位对准方法，链路预算降低了4%。
Deploying relay nodes in visible light communication (VLC) relieves the requirement of line-of-sight transmission and thus extends the service coverage of VLC systems. In this paper, we propose to employ physical-layer network coding (PNC) in the VLC system to increase its throughput by boosting the data transmission at the relay node. We design a unified PNC–VLC framework that includes both the physical-layer signal processing algorithm and the medium access control method. To further improve the feasibility, we propose a novel phase-aligning method to counter the phase offset among nodes in practical VLC systems. Experimental results show a throughput improvement of 88.23% by employing the PNC–VLC framework, and the link budget is reduced by 4 dB at a bit error rate of 3.8 × 10−3 by using the phase-aligning method.