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为了研究中层海水中水色三要素对水下量子通信性能的影响,首先根据水色三要素的吸收和散射模型,提出了海水中叶绿素浓度、光量子信号波长和水下量子链路衰减的关系;然后针对退极化信道,分析了叶绿素浓度、光量子信号波长与信道容量、信道平均保真度和信道误码率之间的定量关系。仿真结果表明,传输距离为20 m,当叶绿素浓度分别为0.5 mg/m~3和1.5 mg/m~3时,水下量子通信信道容量、信道平均保真度、信道误码率依次分别为0.263 1和0.142 3,0.705 2和0.553,0.037 05和0.029 17.当波长分别为400nm和800nm时,通信信道容量、信道平均保真度、信道误码率依次分别为0.229 1和0.428 3,0.914 2和0.943 7,0.012 36和0.006 87。由此可见,叶绿素浓度和光量子信号波长对水下量子通信性能有显著的影响。应根据对海水水色三要素的探测情况,自适应调整系统的各项参数。
In order to study the influence of the three elements of aqua in middle seawater on the performance of underwater quantum communication, the relationship between the concentration of chlorophyll, the wavelength of photon signal and the attenuation of underwater quantum link is proposed based on the absorption and scattering models of three elements of aqua. Depolarization channel, the quantitative relationship between chlorophyll concentration, optical wavelength and channel capacity, channel average fidelity and channel error rate was analyzed. The simulation results show that when the chlorophyll concentration is 0.5 mg / m ~ 3 and 1.5 mg / m ~ 3 respectively, the capacity of underwater quantum communication channel, the average channel fidelity and the channel error rate are respectively 0.263 1 and 0.142 3,0.705 2 and 0.553,0.037 05 and 0.029 17. When the wavelength is 400nm and 800nm respectively, the capacity of communication channel, average channel fidelity and channel error rate are 0.229 1 and 0.428 3, 0.914 2 and 0.943 7, 0.012 36 and 0.006 87. Thus, chlorophyll concentration and optical quantum signal wavelength have a significant impact on underwater quantum communication performance. Should be based on the detection of seawater three elements of the situation, adaptive adjustment of the system parameters.