Layout optimization method of new visible light communication light source in mine tunnel

HE Junyi; FAN Guanghui; ZHANG Min; HAN Yijie; WU Mengxiang; FENG Jiashen

doi:10.16186/j.cnki.1673-9787.2022040020

Abstract：Objectives Aiming at the problem of large differences in visible light communication signals in underground mine tunnels,and increased signal errors at the receiving end,a new visible light communica-tion light source layout method in underground mine tunnels was proposed.Methods Compared with exist-ing light source layout methods,the system performance of the two layout methods was evaluated from three aspects:illumination,received power,and signal-to-noise ratio.The coefficients of variation of illumination uniformity,power standard deviation and signal-to-noise ratio were introduced to evaluate the overall perfor-mance of the system.Results Through simulation experiments,the impact of different half-power angles on the system performance of the layout method in this paper was analyzed,and it was concluded that the opti-mal value of the half-power angle was 50°～70°.When the half-power angle was 70°,compared with the exist-ing light source layout method,the illumination uniformity of the layout method proposed in this article was reduced from 0.758 to 0.407,a reduction of 46.3%,and the difference between the minimum illumination and the maximum illumination was smaller,the illumination distribution was more uniform;in terms of re-ceived power,the power standard deviation was reduced from 0.97 to 0.42,a reduction of 56.7%,and the power fluctuation was reduced too,and the received power distribution was more uniform;in terms of signal-to-noise ratio,the signal-to-noise ratio variation coefficient was reduced from 0.013 7 dropped to 0.007 2,a reduction of 47.7%,and the signal distribution was more uniform.Conclusions The light source layout method proposed in this article was overall better than existing methods,and can provide a new solution for the light source layout in underground mine tunnels.