大气湍流下圆偏振调制性能研究  

Performance of circular polarization modulation in atmospheric turbulence

作　　者：张莉[1,2] 汪井源 郑吉林 张晗 蒲涛 ZHANG Li;WANG Jingyuan;ZHENG Jilin;ZHANG Han;PU Tao(College of Electronic and Optical Engineering&College of Microelectronics,Nanjing University of Posts and Telecommunications,Nanjing 210023,China;College of Communications Engineering,Army Engineering University of PLA,Nanjing 210007,China;No.724 Research Institute of CSIC,Nanjing 211153,China)

机构地区：[1]南京邮电大学电子与光学工程学院微电子学院,江苏南京210023 [2]陆军工程大学通信工程学院,江苏南京210007 [3]中船重工724研究所,江苏南京211153

出　　处：《量子电子学报》2020年第6期737-744,共8页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金青年基金,61504170,61504058;国家自然科学基金,61475193。

摘　　要：结合孔径平均技术,研究了湍流和瞄准误差联合效应信道下圆偏振移位键控(CPOLSK)调制的误码率和中断概率性能。基于Meijer G函数,推导了CPOLSK调制误码率和中断概率的闭合表达式;仿真研究了归一化波束宽度、归一化抖动标准差以及接收孔径对系统平均误码率、中断概率的影响,进行了数值分析,并与开关键控调制(OOK)的误码率进行了比较;通过蒙特卡洛仿真,对基于偏振调制的自由空间光(FSO)通信系统性能的数值分析结果进行了验证。结果表明:同一条件下,CPOLSK调制的误码率性能优于OOK调制;归一化波束宽度对系统性能的影响是非线性的,存在最优值;随着归一化抖动标准差的增大,系统的性能会下降;增大接收孔径尺寸,可以有效地提高系统的性能。研究结果对FSO通信系统的设计具有实际指导意义。The average bit error rate(BER)and outage probability of circular polarization shift key(CPOLSK)modulation under the combined effect channel of atmospheric turbulence and pointing errors are investigated by using aperture averaging technique.The closed expressions of BER and outage probability are derived by using Meijer G function.The influences of normalized beamwidth,normalized jitter and receiver aperture size on the average BER and outage probability are simulated,and numerical analysis is also carried out.And then the BER performance of CPOLSK modulation is compared with that of on-off keying(OOK)modulation.All numerical simulation results are verified by Monte-Carlo simulation.Results show that the BER performance of CPOLSK modulation is better than OOK modulation under the same conditon,and the influence of normalized beam width on system performance is nonlinear and there is an optimal value.It is also shown that with the increase of the normalized jitter standard deviation,the performance of the system will decrease,while increasing the receiving aperture size can effectively improve the performance of the system.The results are of practical significance for the design of FSO communication system.

关 键 词：光通信 孔径平均技术 圆偏振移位键控 开关键控调制 平均误码率 中断概率 自由空间光 

分 类 号：TN929.12[电子电信—通信与信息系统]