摘要
大气激光通信中,湍流引起的光强闪烁严重影响通信系统的性能指标(误码率)。通过对湍流条件下光强分布的数值仿真,得出弱湍流时接收光强服从对数正态分布,与Rytov理论一致。用随机过程分析的方法给出了系统误码率与光强闪烁的关系,并进行MATLAB数值模拟。研究表明误码率随对数振幅方差(湍流强度)的增加而上升,且当对数振幅方差在0～0.02时,误码率随对数振幅方差的变化较快,近似呈线性递增。在工程中,可采用自适应光学或多发射机等技术抑制湍流对大气激光通信的影响。
Because of the influence of atmosphere, the scintillation caused by the atmosphere turbulence influences performante characteristics（bit error ratio）of the communication of system seriously. Based on the simulation of the distribution intensity, the distribution of received intensity in week turbulence is Gaussian distribution, which is in accord with the Rytov theroy. The relationship of bit error ratio （BER） and scintillation is presented by the method of random process analysis. The MATLAB simulation is carried out and the results show that BER increases quickly with the variance of log-amplitude. When the variance of log-amplitude is 0-0. 02, the BER varies linearly. Adaptive optics and multiple transmitters can be used to restrain the effect caused by the turbulence in the application.
出处
《光学与光电技术》
2007年第6期15-17,共3页
Optics & Optoelectronic Technology
关键词
激光通信
湍流
误码率
laser communication
turbulence
bit error ratio
