可见光通信中继技术研究

可见光通信(VLC)作为射频通信的有效补充技术, 可提供高速率、超低时延、绿色环保、低成本和安全可靠的通信服务。但覆盖范围受限和链路遮挡已成为VLC系统可靠通信的瓶颈。针对上述问题, 在VLC中采用中继技术是一种有效方法。文章从中继技术的功能特性出发, 分析中继协作的VLC系统模型, 对中继协作的VLC系统的应用场景、组网方式、转发策略、调制方式、工作模式和多址接入等关键技术进行综述, 并对采用相应关键技术中继协作的VLC系统的可靠性、安全性和能效性进行分析, 最后提出采用非正交多址、多输入多输出和全双工模式的多中继协作的VLC异构网络是未来通信网络的研究重点和方向。

Abstract

As a beneficial supplement to radio frequency communication, Visible Light Communication (VLC) can provide high-speed, ultra-low delay, green, low-cost, safe and reliable communication services. However, limited coverage range has become the bottleneck of long distance and reliable communication in VLC system. Since the coverage range of VLC is limited, an effective method is proposed to use relay technology in VLC system. The paper starts from the functional characteristics of relay technology, and analyzes the relay system model. Then we give a review on several key technologies of relay-assisted VLC, including the application scenario, network mode, transfer agreement, modulation mode, working mode and non-orthogonal multiple access. The reliable performance, safety and energy efficiency with the corresponding key technologies are analyzed. Finally, we point out a research emphasis and direction in VLC by adopting the heterogeneous network, non-orthogonal multiple access, multi-input and multi-output, full-duplex mode multiple and relays collaboration for the next generation communication network.

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朱蔓菁, 王玉皞, 刘晓东. 可见光通信中继技术研究[J]. 光通信研究, 2021, 47(3): 64. ZHU Man-jing, WANG Yu-hao, LIU Xiao-dong. Research on Relay Technology of Visible Light Communication[J]. Study On Optical Communications, 2021, 47(3): 64.

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