杨春勇，杨　杰，侯　金，陈少平

(中南民族大学 电子信息工程学院，智能无线通信湖北省重点实验室，武汉 430074)



室内可见光通信遮挡场景下的可靠性评估

杨春勇，杨杰，侯金，陈少平

(中南民族大学 电子信息工程学院，智能无线通信湖北省重点实验室，武汉 430074)

摘要针对室内可见光通信应用场景，采用光线追踪方法分析了无遮挡、半遮挡和全遮挡三种模型下信号传输特性，研究了接收机探测器视场角与三种模型下通信性能之间的对应关系.研究结果表明：探测器所处状态由全遮挡模型切换至半遮挡模型时，平均接收信噪比仅降低1.51dB.切换至全遮挡状态时，平均信噪比降至11.96dB，室内中心接收点仍能满足通信基本要求.当视场角为50°时，可满足室内不同遮挡模型切换时信号不中断的通信需求.

关键词光通信；可见光通信；遮挡场景；视场角

Evaluation of Reliability on Indoor Visible Light Communication under Shading Scenario

YangChunyong,YangJie,HouJin,ChenShaoping

(Hubei Key Laboratory of Intelligent Wireless Communication, College of Electronics and Information Engineering, South-Central University for Nationalities,Wuhan 430074,China)

AbstractAiming at indoor visible light communication scenarios, the ray tracing method is used to analyze signal transmission characteristics of unobstructed、half blocked and full blocked model, and investigate the corresponding relationship between the field of view of the receiver concentrator and the performance of three models. The numerical results show that, when the state of detector switches from unobstructed model to half blocked model, the average received SNR only decreases 1.51 dB. While the state switches to full blocked model, the average SNR reduces to 11.96 dB, furthermore, the center receiving point of the room can still meet the basic requirements of communication. When the field of view is 50 °, it can meet the requirements of continuous communication for hand over between different indoor blocked models.

Keywordsoptical communications; visible light communication; shading scenario; field of view

可见光通信(VLC)因频谱资源丰富、保密性强、无电磁干扰等优点在通信领域备受关注[1-3]，遮挡效应是影响其获得广泛应用的关键性因素，近年来人们一直致力于突破这项障碍.

可见光波长较短，信号强度在遮挡下衰减严重.针对阴影遮挡问题，文献[4,5]以人引起的遮挡为例，研究了红外通信中阴影遮挡对室内信道特性的影响.文献[6]分析了VLC链路阴影遮挡时，LED数量变化对通信性能的影响，确定了最优化LED数量.文献[7]基于室内可见光信道特性研究了墙面反射及码间干扰对通信性能的影响，发现码间干扰会随着传输速率……