业务驱动的空间通信传输与接入方法

In the development of mobile Internet and Internet of things, it urgently needs to address the problem of wide area coverage for information services. For the satellite-based wireless access scenario, as the contradiction between the extent and intensity of coverage under restricted resources, the requirements of broadband information services for power, spectrum and other resources become more rigorous. At present, it is difficult to support the large capacity的service demand under the pre-determined full coverage mode presented by Iridium satellite Constellation. Moreover, the traditional technical methods, such as coding and modulation, have already approached their theoretical limits. Therefore it is urgent to find theoretical breakthroughs for the future space communications..Towards this end, it is crucial to tackle the challenge faced by satellite networks, such as dynamic changes of the satellite-terrestrial topology, wide coverage requirements, severely restricted resources, and so on. The subject considers the service-driven communication structure and access mode to proceed smart coverage and resource focusing, and using agile communication to crack the contradiction between the extent and intensity of coverage. The main objective is to perform efficiently agile communication for dynamic service under restricted resources. To be specific, our researches will concentrate on, the flexible focusing service for the dynamic changes of network and service requirements;demand-oriented smart coverage for the dynamic time space distributed access requests of service; and the resource sharing and signal processing methods for satellite-terrestrial coordination under complex interference among multiple services. This project will explore the methods of the space agile communication and the utilization ways of resources for satellite-terrestrial coordination, and propose the demonstration scheme, aiming at a comprehensive solution to the contradiction between the extent and intensity of coverage under the limited sources.

移动互联网与物联网发展迫切需要解决广域信息服务问题。依托卫星的空间通信接入服务，面临受限资源下覆盖广度与强度的突出矛盾，宽带信息服务对功率、频谱等资源要求更加苛刻。目前以铱星为代表的预定全覆盖方式难以支持用户的大容量业务需求，编码调制等传统技术措施已接近理论极限，未来的空间通信急需理论突破，综合解决空间网络面临的星地拓扑动态变化、覆盖范围要求广、资源严重受限等问题。本课题以业务驱动通信架构与接入方式，进行机动覆盖与资源聚焦，以灵巧通信破解覆盖广度与强度的矛盾。围绕“资源受限下动态业务的高效灵巧通信的”核心目标：①针对动态变化的网络与业务需求，研究弹性聚焦服务；②针对业务的动态时空分布接入请求，研究按需机动覆盖；③针对多业务间的复杂干扰，研究空地协同的资源共享与信号处理方法。探索空间灵巧通信方法与空地资源协同利用途径，完成演示系统方案，为解决受限资源下的覆盖广度与强度的矛盾奠定基础。

移动互联网与物联网发展迫切需要解决广域信息服务问题。依托卫星的空间通信接入服务，面临受限资源下覆盖广度与强度的突出矛盾，宽带信息服务对功率、频谱等资源要求更加苛刻。目前的预定全覆盖方式难以支持用户的大容量业务需求。本课题以业务驱动通信架构与接入方式，进行机动覆盖与资源聚焦，以灵巧通信破解覆盖广度与强度的矛盾。.首先，针对星地拓扑动态变化引发网络架构设计问题，研究面向动态网络的弹性聚焦服务技术，解决频率等资源动态调配与可靠通信的矛盾。通过建立信令与业务分离的网络架构，提出大容量用户接入协议和与星间链路质量动态适配的信令交互模式，实现全网用户需求与资源的统一管理，大幅度提升网络效能。.其次，针对空间网络通信宽带化发展需求，研究广域范围要求下的按需灵巧覆盖技术，有效克服卫星通信网络覆盖强度与覆盖广度的制约矛盾。设计电磁表面及天线控制算法，形成基于相控阵天线的波束赋形方案，实现覆盖强度与广度间的优化，有效提升卫星通信资源利用率，实现载荷有限条件下的高效宽带通信。.第三，针对空间网络通信资源受限与服务需求间的矛盾，研究空地协同的资源高效共享技术，突破当前频谱资源条块分割的粗放型使用模式，解决多系统共享资源所造成的复杂干扰问题。通过建立空地网络协同频谱共享与干扰管理架构，分析空地干扰机理，设计空时频多域资源协同优化方法，在频谱、能源以及器件的综合约束条件下实现资源的认知高效共享。.实施中，在IEEE JSAC等国际期刊和IEEE ICC等本领域重要的国际会议上发表论文51篇，其中SCI论文33篇，申请发明专利21项。参与获国家技术发明二等奖1项、中国通信学会科学技术奖一等奖1项、二等奖1项，获IWCMC国际会议最佳论文奖1项。课题组成员杨帆老师于2019年入选IEEE Fellow, 课题成员获2019年国家优秀青年项目资助2项。

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