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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°)。
Using the light tracing method to analyze the diffusive transmission characteristics of VLC system with 4-LED array distribution, we found that the FOV of the receiver condenser can be affected by the choice of optical gain and effective incident light flux Receive Signal to Noise Ratio (SNR). Through the numerical calculation of Matlab, the influence of the LED array structure on the average received SNR and the selective relationship between the receiver field of view and the received SNR are discussed. The results show that there is a 4-LED array optimal structure to meet the maximum average reception SNR condition of the best coverage; based on this structure, the data transmission rate of 100 Mb / s system transmission performance, the receiver compound parabolic lens When the FOV is reduced from 90 ° to 43 °, the average received WTBX SNR increases from 15.6dB to 22.5dB, and the signal coverage quality is the best. When the data transmission rate is increased, the FOV satisfying the optimal received SNR decreases correspondingly and exists Full coverage Optimize the viewing angle range (34.3 °, 43 °).