光接收机作为室内可见光通信系统的重要组成部分, 其接收角度的不同将会影响系统的性能。传统可见光通信系统采用的是垂直光接收机, 其室内角落的信噪比 (SNR)较低, 信噪比峰 -谷值较大。为了降低 SNR峰-谷值, 提高 SNR在室内分布的均匀性, 本文提出并设计了基于遗传算法的倾斜式光接收机。数值分析结果表明, 采用倾斜式接收机的可见光通信系统, SNR的分布更加均匀。在 12 W单个 LED光源的系统中, SNR的峰-谷值改善了4.98 dB。在总功率为 12 W的四个 LED光源的系统中, SNR的峰-谷值改善了 2.51 dB。由此可见, 在可见光通信系统中, 采用倾斜式光接收机可以改善系统的性能。

Receiver plane is an important component of Visible Light Communication (VLC) system, and its receiving angle will affect the performance of system. In traditional VLC system, a vertical optical receiver plane is used, receivers may locate at some places far away from LED source, where the Signal to Noise Ratio (SNR) is much smaller than other areas. At the same time, the peak-to-valley value of SNR is so large. In this paper, we propose and design tilting receiver plane based on Genetic Algorithm to reduce the peak-to-valley value of SNR, and improve the uniform distribution of SNR in a whole room. Based on the numerical results of the proposed indoor VLC system, when using the tilting receiver, the SNR distribution will be improved in VLC system in the use of tilting receiver. The results of numerical analysis show that in the case of one LED source, there is a 4.98 dB improvement of peak-to-valley SNR value. In the case of four LED sources, there is a 2.51 dB improvement of peak-to-valley value of SNR. Hence, the tilting receiver can be proposed to improve the performance of VLC system.