摘要
采用光线追踪方法分析4-LED阵列分布结构下室内可见光通信(VLC)系统的漫射传输特性,发现接收机聚光器视场角(FOV)可以通过对光学增益和捕获有效入射光通量的选择影响接收信噪比(SNR)。通过Matlab数值计算,讨论LED阵列结构对平均接收SNR的影响及接收机视场角与接收SNR的选择性关系。研究结果表明,存在一种4-LED阵列优化结构满足最大平均接收SNR条件的最佳覆盖;以此结构为基础,分析数据传输速率为100 Mb/s时的系统传输性能,接收机复合抛物面透镜FOV从90°减至43°时,平均接收WTBX〗SNR从15.6dB增大至22.5dB,信号覆盖质量最佳;当提高数据传输速率,则满足最优接收SNR的FOV相应减小,并且存在全覆盖优化视场角范围(34.3°,43°)。
Based on 4-LED distribution structure, the ray tracing method is used to analyze the diffuse transmission characteristics of indoor visible light communication (VLC) system. It is found that the field-of-view (FOV) of the receiver concentrator can affect the received signal power by selecting optical gain and the captured incident light flux. By the Matlab numerical calculation, the influence of LED array structure on the average received signal-to-noise-ratio (SNR) and the selective relationship between the receiver FOV and the received power are discussed. The numerical results show that there is an opti- mized 4-LED array structure to obtain the best coverage in the condition of maximum average received SNR. And based on this structure analyzing the system transmission performance at data rate of 100 Mbit/s,it is shown that as the FOV of the selected compound parabolic lens reduces from 90 ° to 43 °, the average SNR of received signal correspondingly increases from 15.6 dB to 22.5 dB,and the coverage of the indoor signal achieves the best state. And with the increase of data rate, the receiver FOV to meet the optimized received SNR requirement is reduced accordingly,and its optimized range for full coverage is (34.3~,43~).
出处
《光电子.激光》
EI
CAS
CSCD
北大核心
2016年第5期491-497,共7页
Journal of Optoelectronics·Laser
基金
国家自然科学基金(61002013、11147014)
湖北省自然科学基金(2014CFA051)
中央高校基本科研业务费专项资金(CZY13034)资助项目