基于脉冲激光在大气中传输的信道补偿  

Channel Compensation Based on Pulse Laser Propagating in Atmosphere

作　　者：姚海峰 倪小龙[2] 陈纯毅[2] 佟首峰[2] 姜会林[2] 刘智[2] Yao Haifeng;Ni Xiaolong;Chen Chunyi;Tong Shoufeng;Jiang Huilin;Liu Zhi(School of Optoelectronics Engineering, Changchun University of Science and Technology, Changchun, Jilin 130022, China;z Key Discipline for National Defense of Space-Ground Laser Communication Technology Laboratory Changchun University of Science and Technology, Changchun, Jilin 130022, China)

机构地区：[1]长春理工大学光电工程学院,吉林长春130022 [2]长春理工大学空地激光通信技术国防重点学科实验室,吉林长春130022

出　　处：《光学学报》2018年第1期20-28,共9页Acta Optica Sinica

基　　金：国家自然科学基金(61475025;61775022);国防科工局基础科研基金(A362080230)

摘　　要：为了研究矩形脉冲激光在大气中的传输特性,建立了脉冲信号在大气中传输的数学模型,并提出了一种信道补偿算法。在相距6.2km的两栋高楼之间开展了100 MHz的矩形脉冲传输实验,并在FPGA编译软件上对信道补偿算法进行了验证。结果表明:脉冲信号经过大气信道后发生了畸变,大气信道在频域上表现为一个低通系统,抑制了大于430 MHz的高频信号。运用信道补偿算法后,脉冲畸变得到有效抑制,系统带宽得到拓宽,信号的信噪比提高了5倍左右;当光信噪比为10dB时,误码率降低为10-6。In order to investigate the propagation characteristics of rectangular pulse laser in atmosphere,a mathematical model of pulse signal propagation in atmosphere is established and a compensation algorithm for channel is proposed.A propagation experiment of 100 MHz rectangular pulse is carried out between two buildings with a distance of 6.2 km,and the compensation algorithm for channel is verified by FPGA compliling software.The experimental results indicate that the pulse signal is distorted after passing through the atmospheric channel.The performance of atmospheric channel can be considered as a low-pass system in the frequency domain and signals with high frequency larger than 430 MHz are suppressed.With the channel compensation algorithm,the distortion of rectangular optical pulse is suppressed effectively,the system bandwidth is improved,and the signal noise ratio is increased by 5 times.The bit error rate decreases to about 10^-6 when the optical signal noise ratio is 10 dB.

关 键 词：大气光学 脉冲畸变 信道补偿 信噪比 误码率 

分 类 号：TN929.12[电子电信—通信与信息系统]