低轨道量子卫星通信时分交换方案及性能分析  

Time Division Switching Scheme and Performance Analysis of Low Orbit Quantum Satellite Communication

作　　者：杨光[1] 聂敏[1] 江帆[1] 

机构地区：[1]西安邮电大学通信与信息工程学院,西安710121

出　　处：《电信科学》2014年第4期68-73,共6页Telecommunications Science

基　　金：国家自然科学基金资助项目(No.61172071;No.61201194);陕西省教育厅科学研究计划基金资助项目(No.2013JK1064)

摘　　要：为解决低轨道量子卫星覆盖范围下,多个量子用户的接入与信息传输问题,提出了一种多波束时分量子交换方案,并详细给出了时分量子卫星交换机的工作原理。在不同的通信时隙上,为用户分别建立量子纠缠信道并进行量子信息传送。为克服星地链路及星际链路的时延问题,提出了基于量子信道字的交换和传输方法,从而降低单时隙量子比特传输的平均时延。系统性能分析与仿真结果表明,时隙个数、量子信道字长是影响系统的用户数量、吞吐量、呼损指标的关键因素。在一定的信道条件下,通过对这些系统参数进行合理设计,能够满足特定量子卫星系统的服务需求。Low orbit quantum satellite system is used to realize a worldwide secure communication.To solve the problem of multiple quantum users＇ access and information transmission in satellite coverage,a multi-beam time division quantum switching scheme was proposed,and a detailed description of the structure and working process of the time division quantum switch were given.In different time slot,the switch set up a quantum entanglement swapping channel for different users to transmit their quantum information.To overcome the delay in satellite-earth link and satellite-satellite link,a switching and transmission method was proposed based on quantum channel byte,which decreased the average qubit transmission delay for single time slot.Performance analysis shows that the number of time slot and the length of quantum channel byte have the key influence on the user number,the traffic and the call of loss.In certain channel conditions,by rational designing of these parameters,the quantum satellite communication system can meet the demanded service requirements.

关 键 词：量子通信 卫星通信 时分多址 交换网络 量子纠缠 

分 类 号：TN927.2[电子电信—通信与信息系统]