摘要
为降低海洋湍流对水下光通信系统链路性能的影响,将光孤子脉冲应用于水下通信。假定水下通信系统采用开关键控调制,信道采用描述海洋弱湍流的Lognormal模型,推导出了海洋闪烁系数的具体表达式和含形状因子和闪烁系数的通信误码率表达式,仿真分析了不同湍流强度、海洋湍流参数下光孤子、矩形、高斯脉冲光束的通信误码率,最后从脉冲时域角度对比研究三种脉冲光束。结果表明:随着湍流强度的变化,信噪比为5dB时,光孤子脉冲的误码率比高斯型和矩形脉冲的误码率低至少3个数量级。接收孔径和温度与盐度波动对海洋光学湍流贡献的比值是对水下通信误码率影响较灵敏的因素;随着海洋湍流影响因素的变化,光孤子脉冲抵抗外界环境的能力强于其他脉冲,其误码率始终小于高斯和矩形误码率。光孤子时域展宽比高斯、矩形展宽小,但随着距离的增加,三种脉冲展宽趋于一致。仿真结果验证了光孤子脉冲用于水下通信的优势,可为下一步研究提供理论参考。
In order to reduce the influence of oceanic turbulence on link performance of underwater optical communication system,an optical soliton is used to underwater optical communication.On-off key modulation is used in the underwater communication system.We use the Lognormal channel model that describes the weak oceanic turbulence to deduce the specific expression of the oceanic scintillation and the communication bit error rate expression containing the form shape factor and scintillation,analyze and compare communication bit error rates of solitonic,rectangular,Gaussian pulses under different turbulence intensities and oceanic turbulence parameters in pulse time domain.The results show that the bit error rate of the solitonic pulses is lower than that of the Gaussian and rectangular pulses at least 3 orders of magnitude with the change of the turbulence intensity when the signalnoise ratio is 5 dB.The aperture diamiter and the ratio of oceanic turbulences induced by temperature and salinity are sensitive factors in the underwater communication.Under different influencing factors of oceanic turbulence,the soliton pulses have better anti-interference ability and lower bit error rate than Gaussian and rectangular pulses.The broadening of the soliton pulses is smaller than that of the Gaussian and the rectangular pulses,but as the distance increases,three pulses broadening tends to be consistent.The simulation results verify the advantages of thesolitonic pulse for underwater communication,and could provide the theoretical reference for further research.
作者
王阳
张鹏
李晓燕
王超
王大帅
佟首峰
Wang Yang;Zhang Peng;Li Xiaoyan;Wang Chao;Wang Dashuai;Tong Shoufeng(National and Local Joint Engineering Research Center of Space Optoelectronics Technology, Changchun University of Science and Technology, Changchun, Jilin 130022, China;School of Optoelectronic Engineering, Changchun University of Science and Technology , Changchun, Jilin 130022, China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2018年第5期186-193,共8页
Chinese Journal of Lasers
基金
国家自然科学基金(61705019
91438204)
吉林省青年人才托举工程项目(2017-2018)
吉林省优秀青年人才基金(20170520161JH)
吉林省自然科学基金项目(20180101338JC)
关键词
光通信
光孤子
闪烁系数
误码率
脉冲展宽
海洋湍流
optical communications
optical soliton
scintillation index
bit error rate
pulse broadening
oceanicturbulence
