大气衰减信道光通信系统传输误码率研究
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摘要
为了解决激光雷达通讯系统噪声干扰影响系统性能的问题,研究了激光在大气衰减信道传输的信噪比和误码率。根据大气吸收散射特性,给出了主导因素气溶胶的大气衰减系数,从激光雷达传输系统的光电信号转换关系,给出了只考虑大气衰减影响的探测器输出信噪比以及误码率数学模型。通过计算与实验分析,结果表明不同能见度条件下,误码率性能随接收器的接收孔径变化趋势存在一定的差异,误码率与能见度值成反比关系。为了明显改善误码率,达到更好的通信系统性能,需要对接收器的接收孔径进行设计研究,该模型可有效评估大气衰减条件下激光雷达系统误码率性能,并为相关理论研究提供参考。
In order to solve the problem of the system performance caused by the noise interference of radar communication system,this paper studies the signal-to-noise ratio and BER of laser propagation in the atmospheric attenuation channel.According to the characteristics of atmospheric absorption and scattering,the atmospheric attenuation coefficient of the dominant factor aerosol is given,and the signal to noise ratio and the BER mathematical model of the detector are given considering the effect of atmospheric attenuation from the optical signal conversion of the laser transmission system.Through calculation and experimental analysis,the results show that the BER performance varies with the receiver aperture in different visibility conditions,and the BER is inversely proportional to the visibility value.In order to improve the BER and achieve better performance of the communication system,it is necessary to design and study the receiver aperture,the research model can effectively evaluate the BER performance of laser system under the condition of atmospheric attenuation,and provide reference for relevant theoretical research.
In order to solve the problem of the system performance caused by the noise interference of radar communication system,this paper studies the signal-to-noise ratio and BER of laser propagation in the atmospheric attenuation channel.According to the characteristics of atmospheric absorption and scattering,the atmospheric attenuation coefficient of the dominant factor aerosol is given,and the signal to noise ratio and the BER mathematical model of the detector are given considering the effect of atmospheric attenuation from the optical signal conversion of the laser transmission system.Through calculation and experimental analysis,the results show that the BER performance varies with the receiver aperture in different visibility conditions,and the BER is inversely proportional to the visibility value.In order to improve the BER and achieve better performance of the communication system,it is necessary to design and study the receiver aperture,the research model can effectively evaluate the BER performance of laser system under the condition of atmospheric attenuation,and provide reference for relevant theoretical research.
引文
[1]RICKLIN J C,HAMMEL S M,EATON F D,et al.Atmospheric channel effects on free-space laser communication[J].Journal of Optical and Fiber Communications,2006,3(2):111-158.
[2]MAJUMDAR A K.Free-space laser communication performance in the atmospheric channel[J].Journal of Optical and Fiber Communications,2005,2(4):345-396.
[3]刘保菊,张长森.大气湍流对复杂路径下光强起伏及误码率的影响[J].应用科技,2007,34(3):1-3,18.
[4]MAHDIEH M H,Pournoury M.Atmospheric turbulence and numerical evaluation of bit error rate(BER)in free-space communication[J].Optics&Laser Technology,2010,42(1):55-60.
[5]FERDINANDOV E,PACHEDJIEVA B,BONEV B.Joint Influence of heterogeneous stochastic factors on bit error rate of ground-to-ground free-space laser communication system[J].Optics Communications2007,270(2):121-127.
[6]刘丹,刘智,王璞瑶,等.一种大气激光通信系统抗干扰调制一解调技术[J].中国激光,2012,39(7):565-570.
[7]孟祥谦,胡顺星,王英俭,等.基于电荷耦合器件探测气溶胶散射相函数与大气能见度的研究[J].光学学报,2012,32(9):137-143.
[8]陈纯毅,杨华民,姜会林,等.大气光通信中大孔径接收性能分析与孔径尺寸选择[J].中国激光,2009,36(11):2957-2960.
[9]杨昌旗,姜义汉,饶长辉.孔径平均对自由空间光通信误码率的影响[J].光学学报,2007,27(2):212-218.
[10]崔朝龙,黄宏华,梅海平,等.利用米散射激光雷达获取湍流信息的方法研究[J].大气与环境光学学报,2011,6(2):89-94.
[2]MAJUMDAR A K.Free-space laser communication performance in the atmospheric channel[J].Journal of Optical and Fiber Communications,2005,2(4):345-396.
[3]刘保菊,张长森.大气湍流对复杂路径下光强起伏及误码率的影响[J].应用科技,2007,34(3):1-3,18.
[4]MAHDIEH M H,Pournoury M.Atmospheric turbulence and numerical evaluation of bit error rate(BER)in free-space communication[J].Optics&Laser Technology,2010,42(1):55-60.
[5]FERDINANDOV E,PACHEDJIEVA B,BONEV B.Joint Influence of heterogeneous stochastic factors on bit error rate of ground-to-ground free-space laser communication system[J].Optics Communications2007,270(2):121-127.
[6]刘丹,刘智,王璞瑶,等.一种大气激光通信系统抗干扰调制一解调技术[J].中国激光,2012,39(7):565-570.
[7]孟祥谦,胡顺星,王英俭,等.基于电荷耦合器件探测气溶胶散射相函数与大气能见度的研究[J].光学学报,2012,32(9):137-143.
[8]陈纯毅,杨华民,姜会林,等.大气光通信中大孔径接收性能分析与孔径尺寸选择[J].中国激光,2009,36(11):2957-2960.
[9]杨昌旗,姜义汉,饶长辉.孔径平均对自由空间光通信误码率的影响[J].光学学报,2007,27(2):212-218.
[10]崔朝龙,黄宏华,梅海平,等.利用米散射激光雷达获取湍流信息的方法研究[J].大气与环境光学学报,2011,6(2):89-94.