Research On The Performance Of Non-line-of-sight Ultraviolet Communication In Atmospheric Turbulence And Haze

Non-line-of-sight(NLOS)Ultraviolet communication is a new type of communication that can make up for the shortcomings of traditional laser and infrared communication by the aid of the scattering of atmospheric particles,and is considered the preferred scheme to solve the last mile bandwidth.It has broad application prospects in military operations or mountainous areas and other complex terrain environment,and shows many advantages such as good security,low background noise,strong anti-interference ability and so on.This paper studies coplanar and non coplanar of single scattering system model.According to Monte Carlo method and using MATLAB simulation software to simulate the process of photon scattering,to confirm the influence of atmospheric parameters on the performance of NLOS ultraviolet communication system.The impulse response of the system is improved and the influence of different off-axis angles and communication distance on the impulse response of the system are analyzed.The discrete Fourier transform of the impulse response is proposed to obtain the 3d B bandwidth of the system.The effect of strong turbulence on the performance of the ultraviolet communication system is analyzed.Proposing the research method of short range ultraviolet communication system with weak turbulence.Using the relationship between the concentration of black carbon,the visibility and relative humidity,and the atmospheric optical properties to study the influence of black carbon concentration and relative humidity and visibility on the performance of ultraviolet light.The following conclusions are drawn from the study of the above content:1.The path loss of the system is changed through changing the path of the photon transmission and the size of the common scattering body,the smaller the photon transport path,the larger the public scattering body,the smaller the path loss,the shorter the impulse response time,larger bandwidth,greater channel capacity.There are many combination of different system parameters which can make sure the same system performance's requirements.2.Weak turbulence enhances the Rayleigh scattering of the atmosphere,causing the path loss reduced,and the signal noise ratio(SNR)increased,and the bit error rate reduced.When the turbulence increases to a certain value,the stronger the turbulence,the greater the probability of fading,the greater the receiving aperture,the greater the SNR,the smaller the bit error rate.3.The greater of particle concentration and particle size,the stronger scattering and absorption of photons by particles,the greater the path loss,the greater of the error rate.The smaller the visibility,the greater of the path loss,the lower signal to noise ratio,the greater the bit error rate.The larger the relative humidity,the more the particles in the atmosphere gather together,resulting in a decrease in the average concentration of the atmosphere,the absorption of the atmosphere to the photon weakened,the path loss decreases,SNR increases,the error rate will reduce.