基于Exponentiated Weibull湍流模型的OFDM光链路性能分析  

Analysis of BER performance for OFDM optical link under Exponentiated Weibull atmospheric turbulence

作　　者：张韵 王翔[1] 赵尚弘[1] 蒙文[1] 赵静[1] 刘韵[1] 丁西峰 ZHANG Yun;WANG Xiang;ZHAO Shang-hong;MENG Wen;ZHAO Jing;LIU Yun;DING Xi-feng(Information and Navigation college,Air Force Engineering University,X i'an 710077 ,China)

机构地区：[1]空军工程大学信息与导航学院,陕西西安710077

出　　处：《激光与红外》2018年第3期311-317,共7页Laser & Infrared

摘　　要：研究了Exponentiated Weibull大气湍流下OFDM光链路误码性能,分别考虑大气湍流的单独影响及大气湍流和指向误差对误码率的联合影响,利用Meijer G函数推导出多载波条件下总平均误码率的闭合表达式。根据总平均误码率闭合表达式进行了仿真,分析了在不同大气湍流强度、QAM调制阶数、抖动标准差和波束宽度条件下,链路误码率随发射功率变化的关系。通过仿真分析证明仅在大气湍流影响下发射功率的增加对误码率的改善优于在大气湍流与指向误差的联合影响下;不同调制阶数,增大发射功率对链路误码性能的改善近乎相同;随着湍流强度、抖动标准差和波束宽度的增加,误码率增加。The bit error rate(B E R)performance of the OFDM optical communication link is investigated under Exponentiated Weibull atmosphere turbulence.Considering the single effect of Exponentiated Weibull atmosphere turbulence and the combined effects of the Exponentiated Weibull atmosphere turbulence and pointing errors on BER,the closed-form expressions of average BER are derived under multi-carrier based on a Meijer's G function.The change relationship of the BER performance with the transmitted optical power is analyzed under different parameters such as turbulence intensity,QAM modulation order,the normalized jitter standard deviation and the normalized beamwidth.The simulated results show that the improvement of transmitted optical power on BER under the single effect of Exponentiated Weibull atmosphere turbulence is superior to that under the combined effects of the Exponentiated Weibull atmosphere turbulence and pointing errors.The improvements of transmitted optical power on BER are almost same under different modulation orders.BER increases with the increase of turbulence intensity,the normalized jitter standard deviation and the normalized beam-width.

关 键 词：误码率 Exponentiated WEIBULL分布 指向误差 正交频分复用 M-QAM 

分 类 号：TN249[电子电信—物理电子学]