大气激光通信系统中频域反卷积抑制乘性噪声的研究  

Atmospheric Laser Communication System Frequency-Domain Deconvolution Algorithm of Restraining Multiplicative Noise

作　　者：张彤[1,2] 范研[2] 赵谦[1] 

机构地区：[1]西安理工大学计算机科学与工程学院,陕西西安710048 [2]西安理工大学自动化与信息工程学院,陕西西安710048

出　　处：《中国激光》2015年第5期270-275,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(51308057);西安市技术转移促进工程(CXY1340(3))

摘　　要：大气湍流会导致大气激光通信链路误码率性能的恶化,提出了一种频域反卷积方法抑制大气激光通信系统中的乘性噪声。该方法有效地把反卷积技术与大气激光通信相结合,算法中加入快速傅里叶变换(FFT)模块,将信号转换到频域进行反卷积滤波,降低了算法复杂度。利用大气激光通信实测系统在雨天天气下进行实验验证,对比反卷积前后调制信号的星座图并分析系统误码率。实验结果表明,频域反卷积能够降低大气激光通信系统的误码率,是一种抑制大气信道乘性噪声的有效方法。Atmospheric turbulence will lead to the deterioration of the atmospheric laser communication link bit error rate performance. A frequency domain deconvolution method restrained multiplicative noise is proposed in the atmospheric laser communication system. The method is effective to connect the atmospheric laser communication with deconvolution technology. Fast Fourier transform （FFT） module is added to the algorithm, converting the signal into frequency-domain, deconvolution filtering in the frequency-domain, reduces the algorithm complexity. Using atmospheric laser communication measurement system on a rainy day to experimental verification algorithm, contrast before and after deconvolution signal modulation constellation diagram and analyze the system bit error rate. The experimental results show that the frequency-domain deconvolution can reduce the bit error rate of atmospheric laser communication system and is a kind of effective method of multiplicative noise inhibition of atmospheric channel.

关 键 词：大气光学 大气激光通信 乘性噪声 频域反卷积 快速傅里叶变换算法 

分 类 号：E963[军事—军事通信学]