光强度对大气激光通信信道衰落的影响分析
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摘要
激光通信信道处于大气层中,传输激光光束会受到大气环境因素的影响,导致激光光束质量下降,辐射强度衰减,影响激光通信系统运行可靠性。为了有效分析光强度变化对大气激光通信信道衰落的影响,考虑大气湍流效应给出通信信道性能指标的闭合描述式,根据闭合描述式分析了不同大气湍流强度、传输距离、信噪比对误码率的影响,以Exponentiated Weibull分布模型描述大气湍流激光通信信道衰落模型,应用MeiherG函数推导获得大气湍流效应下通信信道衰落的闭合表达式,根据此闭合表达式分析了不同大气湍流强度、传输距离、信噪比对误码率的影响。仿真实验结果表明,随着接收孔径的增大,大气湍流效应的影响逐渐减小,激光通信信道性能随之提高。
Laser communication channel is in the atmosphere. The transmission of laser beam will be influenced by the atmospheric environmental factors,which leads to the decrease of laser beam quality and the attenuation of radiation intensity,which affects the reliability of the laser communication system. In order to effectively analyze the influence of light intensity change on the fading of atmospheric laser communication channel,a closed description of the performance index of communication channel is given in consideration of atmospheric turbulence effect. The effect of different atmospheric turbulence intensity,transmission distance and signal noise ratio on error rate is analyzed according to the closed description formula,and the Exponentiated Weibull distribution model is described. The fading model of atmospheric turbulence laser communication channel is described. A closed expression of communication channel fading under atmospheric turbulence is derived by using MeiherG function. The effect of different atmospheric turbulence intensity,transmission distance and signal noise ratio on error rate is analyzed according to the closed expression. The simulation results show that with the increase of receiving aperture,the influence of atmospheric turbulence effect decreases gradually,and the performance of laser communication channel improves accordingly.
Laser communication channel is in the atmosphere. The transmission of laser beam will be influenced by the atmospheric environmental factors,which leads to the decrease of laser beam quality and the attenuation of radiation intensity,which affects the reliability of the laser communication system. In order to effectively analyze the influence of light intensity change on the fading of atmospheric laser communication channel,a closed description of the performance index of communication channel is given in consideration of atmospheric turbulence effect. The effect of different atmospheric turbulence intensity,transmission distance and signal noise ratio on error rate is analyzed according to the closed description formula,and the Exponentiated Weibull distribution model is described. The fading model of atmospheric turbulence laser communication channel is described. A closed expression of communication channel fading under atmospheric turbulence is derived by using MeiherG function. The effect of different atmospheric turbulence intensity,transmission distance and signal noise ratio on error rate is analyzed according to the closed expression. The simulation results show that with the increase of receiving aperture,the influence of atmospheric turbulence effect decreases gradually,and the performance of laser communication channel improves accordingly.
引文
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[2]张雷,李勃,赵馨,等.大气湍流对空间激光通信跟踪系统的影响[J].光子学报,2017,46(9):91-99.
[3]王惠琴,胡秋,王贺,等.基于训练序列的光信道估计[J].电子测量与仪器学报,2017,31(5):694-699
[4]徐春凤,倪小龙,刘智.激光大气湍流传输中的光强闪烁特性[J].光学精密工程,2016,24(10s):183-189.
[5]苏煜炜,毕明喆,刘鹏,等.基于密集波分复用的20Gbit/s大气激光通信[J].应用光学,2017,38(1):136-139.
[6]徐春凤,韩成,姜会林.航空平台间激光通信捕获链路功率分析与仿真[J].兵工学报,2016,37(11):2015-2021.
[7]杨庆浩,赵娜英,杨雪健,等.降雨对激光通信传输的影响研究[J].西安科技大学学报,2016,36(5):685-690.
[8]张波,彭志涛,吕嘉坤,等.惯性约束核聚变激光驱动器多路光束时间同步测试方法[J].中国激光,2016,43(2):196-200.
[9]马爽,吴志勇,高世杰,等.改进的大气激光通信PPM调制解调系统设计[J].哈尔滨工业大学学报,2016,48(5):105-109.
[10]崔璐,唐义,朱庆炜,等.多光谱可见光通信信道串扰分析[J].物理学报,2016,65(9):112-119.
[11]林宏,周传璘,何武光,等.大气激光通信的双向光束均匀传输[J].科技通报,2017,33(12):125-128
[12]杨云龙,刘博,张文明.大气激光通信系统发散角的设计与仿真[J].半导体光电,2018,39(2):294-297
[13]吴端法,胡淼,陈松,等.基于CCD近地面大气侧向散射系数廓线探测[J].光散射学报,2017,29(1):74-78.