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利用大气散射效应,无线紫外(UV)通信能够提供非视距的无线光通信。推导了紫外无线通信信道的脉冲响应近似解析表达式,以此研究紫外信道的特性。得出了信道长度,码间干扰和信道误码率与收发机光学几何结构,数据速率的关系。研究表明,信道带宽和时延扩展主要取决于大气条件,即大气衰减系数,同时得到了信道容量与衰减系数,通信距离的关系。结果表明,紫外通信系统对收发机光学结构敏感,带宽低,码间干扰严重,适合于低速近距离保密通信。
Using atmospheric scattering, wireless ultraviolet (UV) communications provide non-line-of-sight wireless optical communications. The approximate analytical expression of impulse response of UV wireless communication channel is deduced to study the characteristics of UV channel. The relationship between channel length, intersymbol interference and channel error rate, optical geometry of the transceiver and data rate is obtained. The research shows that the channel bandwidth and the delay spread mainly depend on the atmospheric conditions, namely the atmospheric attenuation coefficient, and the relationship between the channel capacity and the attenuation coefficient and the communication distance. The results show that the ultraviolet communication system is sensitive to the optical structure of the transceiver, has low bandwidth and serious inter-symbol interference and is suitable for low-speed close-range secure communication.