海洋矿物质颗粒对水下量子通信信道性能的影响

Influence of Marine Mineral Particles on Channel Performance of Underwater Quantum Communication

海洋矿物质颗粒是影响光子在水下传输的重要因素之一。为了研究海洋矿物质颗粒对水下量子通信信道性能的影响,建立了海洋矿物质颗粒群密度、传输距离与链路衰减的关系模型并进行了仿真。针对退极化信道,研究了矿物质颗粒群密度和传输距离与信道容量、信道误码率的关系并进行了仿真。仿真结果表明,当传输距离为50 m时,随着矿物质颗粒群密度的增大,链路衰减由0.098 dB增加到2.92 dB,链路效率由6.2×10^(-6)减小到2.7×10^(-7)。当矿物质颗粒群密度为1.0×10^(4) m^(-3)时,随着传输距离的增加,信道容量由0.97逐渐减小到0.6,误码率呈指数增大。由此可见,消光效应造成的影响在传输过程中不可忽略,在实际通信过程中,应根据环境情况及时调整传输设备的参数,保证通信质量。

Marine mineral particles are one of the important factors influencing underwater photon transmission. In order to study the influence of marine mineral particles on the channel performance of underwater quantum communication, the relationship model among marine mineral particle group density, transmission distance and link attenuation is established and the simulation is conducted. In addition, as for depolarization channels, the relationship among mineral particle density, transmission distance, channel capacity and channel bit error rate is established and the simulation is conducted. The simulation results show that when the transmission distance is 50 m, the link attenuation increases from 0.098 dB to 2.92 dB and the link efficiency decreases from 6.2×10^(-6)to 2.7×10^(-7)with the increase of mineral particle group density. When the mineral particle group density is 10^(4) m^(-3), the channel capacity decreases gradually from 0.97 to 0.6 with the increase of transmission distance, but the bit error rate increases exponentially. Thus it can be drawn that the influence caused by the extinction effect cannot be ignored in the transmission process. In the practical communication process, the parameters of the transmission equipment should be adjusted in time according to the environmental conditions in order to ensure the communication quality.