非直视紫外光在非共面通信系统中的脉冲展宽效应

Pulse Broadening Effect of Non-Line-of-Sight Ultraviolet in Noncoplanar Communication System

大气分子和气溶胶颗粒对紫外光具有强烈的散射作用,以紫外光作为信息载体可实现非直视通信。研究紫外光通信中的脉冲展宽效应对于减小码间干扰、提高系统传输速率具有重要意义。基于蒙特卡罗方法建立了非直视紫外光在非共面通信系统中的多次散射传播模型,利用此模型模拟了发射端出射的紫外光经多次散射到达接收端的全过程。结果表明,非直视紫外光在非共面通信系统中的脉冲响应的半峰全宽随着发射端和接收端仰角、接收端偏转角的增大而增大;多次散射对脉冲展宽的贡献随着发射端和接收端仰角增大而增大;采用开关键控调制方式,系统可传输的最大码速率随发射端和接收端仰角的增大而减小。

Atmospheric molecules and aerosol particles have strong scattering effect on ultraviolet（UV）,and the non-line-of-sight communication can be realized by using UV as the information carrier.The study of the pulse broadening effect in UV communication is very important for reducing the intersymbol interference and improving the system transmission rate.Based on the Monte Carlo method,the multiple scattering transmission model of the non-line-of-sight UV in the noncoplanar communication system is established.The whole process that UV is emitted from the transmitter and arrives at the receiver after multiple scattering is simulated.The results show that the full width at half-maximum of the impulse response of non-line-of-sight UV in the noncoplanar communication system will increase with the increasing elevation angle of the transmitter,the elevation angle of the receiver,and the deflection angle of the receiver.The contribution of multiple scattering to the pulse broadening increases with the increasing elevation angles of the transmitter and the receiver.The maximum code rate of the system will be reduced with the increasing elevation angle of the transmitter and the receiver by the on-off keying modulation mode.