室内VLC与Wi-Fi混合组网架构设计及吞吐量性能分析

Architecture design and throughput performance analysis of indoor VLC and Wi-Fi hybrid network

为解决大型室内场所高密度用户、高服务质量业务需求问题,在对Wi-Fi布设现存弊端及可见光通信(visible light communication,VLC)技术特点进行分析的基础上,提出了一种室内多个VLC热点与一个Wi-Fi热点混合组网的方案,对混合组网的系统架构进行了设计。同时,在灯的典型正方形布局方式条件下,以10 m×10 m×3 m的房间为例,给出了一种对多盏灯进行分组以改变VLC热点数量的方法,对布设灯的个数、VLC热点数量及发光半功率角等参数进行了综合优化以提高光链路的吞吐量性能。仿真结果表明,在保证有效的照明面积与通信面积前提下,优化后的光链路吞吐量是一个Wi-Fi热点的16.7倍,同时相比一般的一盏灯即一个热点的布设方法,吞吐量有了明显提升,从而提高了系统总吞吐量及用户的服务质量。

To solve high user density, high service quality needs of the business in the large indoor spaces, based on the analysis to the existing shortcomings of Wi-Fi and to the advantages of visible light communication （VLC） technique, this paper proposed an indoor multiple VLC hotspots and a Wi-Fi hotspot hybrid networking scheme, and designed the system architecture. At the same time, under the lights of the typical square layout condition and took the 10 m × 10 m ×3 m room as an example, it put forward a method to change the numbers of VLC hotspots, and jointly optimized the parameters of the numbers of lamps, the numbers of VLC hotspots and the luminous half power angle in order to improve the throughput performance of opti- cal link. Simulation results show that under the condition of premising the effective illumination area and communication area, the optimized optical link throughput is 16.7 times as much as a Wi-Fi hotspot, compared to the general method that a lamp represents as a hotspot, the throughput performance increases significantly, thereby increasing the total throughput and the service quality for each user.