Eso Elizabeth, Ghassemlooy Zabih, Zvanovec Stanislav, Sathian Juna, Abadi Mojtaba Mansour, Younus Othman Isam
Optical Communications Research Group, Faculty of Engineering and Environment, Northumbria University, Newcastle-upon-Tyne NE1 8ST, UK.
Department of Electromagnetic Field, Faculty of Electrical Engineering, Czech Technical University in Prague, 16627 Prague, Czech Republic.
Sensors (Basel). 2021 Apr 13;21(8):2751. doi: 10.3390/s21082751.
In this paper, we investigate the performance of a vehicular visible light communications (VVLC) link with a non-collimated and incoherent light source (a light-emitting diode) as the transmitter (Tx), and two different optical receiver (Rx) types (a camera and photodiode (PD)) under atmospheric turbulence (AT) conditions with aperture averaging (AA). First, we present simulation results indicating performance improvements in the signal-to-noise ratio (SNR) under AT with AA with increasing size of the optical concentrator. Experimental investigations demonstrate the potency of AA in mitigating the induced signal fading due to the weak to moderate AT regimes in a VVLC system. The experimental results obtained with AA show that the link's performance was stable in terms of the average SNR and the peak SNR for the PD and camera-based Rx links, respectively with <1 dB SNR penalty for both Rxs, as the strength of AT increases compared with the link with no AT.
在本文中，我们研究了一种车载可见光通信（VVLC）链路的性能，该链路以非准直且非相干光源（发光二极管）作为发射器（Tx），并在具有孔径平均（AA）的大气湍流（AT）条件下，采用两种不同类型的光接收器（Rx）（摄像头和光电二极管（PD））。首先，我们给出了模拟结果，表明在具有AA的AT条件下，随着光集中器尺寸的增加，信噪比（SNR）有所提高。实验研究证明了AA在减轻VVLC系统中由弱到中等AT状态引起的信号衰落方面的有效性。通过AA获得的实验结果表明，随着AT强度相对于无AT链路的增加，对于基于PD和摄像头的Rx链路，链路性能在平均SNR和峰值SNR方面分别保持稳定，两种Rx的SNR损失均小于1 dB。
