大气环境影响下的量子卫星通信MIMO-QKD策略性能分析

Performance analysis of MIMO-QKD strategy for quantum satellite communication under the influence of atmospheric environment

为实现全球量子卫星通信,不仅要保证量子卫星在复杂大气信道中的通信性能,而且需要实现多地面站与量子卫星实时且同步通信。在昆虫复眼结构的基础上提出了量子卫星多输入多输出的量子密钥分发策略(MIMO-QKD),仿生复眼地面站通过多波长信号同时进行QKD来提升量子通信性能,并通过波段划分实现多地面站与量子卫星通信,且互不干扰。仿真结果表明,随着大气环境影响系数由0.1增加到1,信道容量减少到0.0018,误码率增加到0.3374。随着复眼容量由1增加到15,信道容量从0.054增加到0.814,误码率从0.2394减少到0.0266;由此可见,在复杂的大气信道环境影响下,基于昆虫复眼结构的量子卫星通信MIMOQKD策略可以明显改善量子卫星通信性能,根据相应的大气环境调整复眼容量从而保证量子密钥分发效率。

In order to realize global quantum satellite communication,it is necessary not only to ensure the communication performance of quantum satellite in complex atmospheric channel,but also to realize real-time and synchronous communication between multiple ground stations and quantum satellite.Based on the insect compound eye structure,a multi input multi output quantum key distribution strategy(MIMO-QKD)for quantum satellite is proposed.The bionic compound eye ground station improves the quantum communication performance by simultaneously performing QKD for multi wavelength signals,and realizes the communication between multi ground stations and quantum satellite through band division without interference with each other.The simulation results show that with the increase of atmospheric environmental impact coefficient from 0.1 to 1,the channel capacity decreases to 0.0018 and the bit error rate increases to 0.3374.With the increase of compound eye volume from 1 to 15,the channel capacity increases from 0.054 to 0.814,and the bit error rate decreases from 0.2394 to 0.0266;It can be seen that under the influence of complex atmospheric channel environment,the MIMO-QKD strategy of quantum satellite communication based on insect compound eye structure can significantly improve the performance of quantum satellite communication,and adjust the compound eye capacity according to the corresponding atmospheric environment,so as to ensure the efficiency of quantum key distribution.