自由空间紫外光通讯技术基于紫外线日盲特性,相对无线通讯技术具有灵活、难以截获、抗干扰性强等诸多特点,并具备一定的非视距通讯能力,在军事通讯领域有着巨大的优越性。应用调频技术实现对电光信号的调制转换,再通过接收频率变换的紫...自由空间紫外光通讯技术基于紫外线日盲特性,相对无线通讯技术具有灵活、难以截获、抗干扰性强等诸多特点,并具备一定的非视距通讯能力,在军事通讯领域有着巨大的优越性。应用调频技术实现对电光信号的调制转换,再通过接收频率变换的紫外光信号,并进行光电转换和频压转换,还原出原始信号。采用该技术研制出的紫外光的通讯系统,传输速率达到1 200 b it/s,误码率小于0.1%,可实现信息的有效传输,传输速率接近国外先进水平。展开更多
Non-Line-of-Sight(NLOS)Ultraviolet(UV)communication uses the atmosphere as a propagation medium.As the communication range increases,turbulence becomes a significant atmospheric process that affects the propagation of...Non-Line-of-Sight(NLOS)Ultraviolet(UV)communication uses the atmosphere as a propagation medium.As the communication range increases,turbulence becomes a significant atmospheric process that affects the propagation of optical waves.This paper presents a more accurate NLOS channel model by considering turbulence-induced Scintillation Attenuation(SA).Then,the Bit Error Rate(BER)during turbulence of the NLOS UV communication system with On-Off Keying(OOK)modulation and Maximum Likelihood(ML)detection is analysed and compared with that in free space without turbulence.The BER dependence is also analysed for different factors,including the refractive index structure parameter,transceiver range,pointing angles,transmitted power,and data rate.展开更多
文摘自由空间紫外光通讯技术基于紫外线日盲特性,相对无线通讯技术具有灵活、难以截获、抗干扰性强等诸多特点,并具备一定的非视距通讯能力,在军事通讯领域有着巨大的优越性。应用调频技术实现对电光信号的调制转换,再通过接收频率变换的紫外光信号,并进行光电转换和频压转换,还原出原始信号。采用该技术研制出的紫外光的通讯系统,传输速率达到1 200 b it/s,误码率小于0.1%,可实现信息的有效传输,传输速率接近国外先进水平。
基金supported by the Open Fund of State Key Laboratory of Information Photonics and Optical Communications(Beijing University of Posts and Telecommunications),China
文摘Non-Line-of-Sight(NLOS)Ultraviolet(UV)communication uses the atmosphere as a propagation medium.As the communication range increases,turbulence becomes a significant atmospheric process that affects the propagation of optical waves.This paper presents a more accurate NLOS channel model by considering turbulence-induced Scintillation Attenuation(SA).Then,the Bit Error Rate(BER)during turbulence of the NLOS UV communication system with On-Off Keying(OOK)modulation and Maximum Likelihood(ML)detection is analysed and compared with that in free space without turbulence.The BER dependence is also analysed for different factors,including the refractive index structure parameter,transceiver range,pointing angles,transmitted power,and data rate.