灰霾粒子与水云粒子不同混合方式对量子卫星通信性能影响

Influence of Different Mixing Patterns of Haze Particles and Water Cloud Particles on the Performance of Quantum Satellite Communication

为了研究混合粒子的不同混合方式对星地量子卫星通信的影响,根据灰霾粒子与水云粒子的谱分布函数,以及不同混合方式下的消光系数,提出了外混合方式中星地量子信道衰减的计算关系,建立了内混合方式中的Core-shell信道衰减模型;分析了在不同混合方式下,混合粒子的粒径比与信道平均保真度、信道误码率之间的定量关系.仿真结果表明,当混合粒子的粒径比分别为0.2和0.8时,外混合粒子对应信道容量、信道平均保真度、信道误码率分别为0.39和0.27,0.8和0.8,0.003和0.009;内混合粒子对应信道容量、信道平均保真度、信道误码率分别为0.8和0.21,0.94和0.81,0.018和0.021.由此可见,灰霾粒子和水云粒子的不同混合方式对量子卫星通信性能的影响有显著差别.因此,在实际的量子卫星通信系统中,应根据混合粒子的不同混合方式自适应调整系统的各项参量,以提高星地量子通信链路的可靠性.

In order to analyze the influence of different mixing patterns of mixed particles on the quantum satellite communication, according to the spectral distribution function of hazeparticles and water-cloud particles and the extinction factor in different mixing patterns, the attenuation relationship of the quantum satellite communication channel in external mixing mode was proposed, and the Core-shell channel attenuation model was established. Thus the quantitative relation among the volume ratio of the mixed particles, fidelity of quantum communication and channel bit error rate were analyzed and simulated. The simulation results show that, when the volume ratio of mixing particles is 0.2 （0.8）, the channel capacity, channel average fidelity and the channel bit error rate of external mixing mode will be 0.39 （0.27）, 0.8 （0.8） and 0.003 （0.009）, respectively; the channel capacity, channel average fidelity and the channel bit error rate of external mixing mode will be 0.8 （0.21）, 0.94 （0.81） and 0.018 （0.021）, respectively. It can be seen that the influence of different mixing modes of haze aerosol and water cloud particles on the communication performance of quantum satellite is different. Therefore, the parameters of the communication system should be adjusted adaptively based on the different mixing patterns to improve the reliability of the quantum satellite communication.