In order to satisfy the spectrum requirements of the future international mobile telecommunication (IMT) systems, to realize scientific allocation and usage of spectrum resources and to avoid spectrum waste brought by...In order to satisfy the spectrum requirements of the future international mobile telecommunication (IMT) systems, to realize scientific allocation and usage of spectrum resources and to avoid spectrum waste brought by allocation in advanced, there is a need to make a reasonable estimation for the spectrum demands of future IMT systems. The estimation results can also provide guidelines for the subsequent spectrum planning and assignment work. This paper gives a description of study progress of related spectrum estimation for future IMT systems. From the analysis of current work and practical situation, the key factors in the estimation methodology are summarized to provide a reference for the following work.展开更多
针对无需对用户终端硬件进行改动,仅通过网络侧适配即可实现直连卫星的存量手机直连卫星系统与国际移动通信(International Mobile Telecommunications,IMT)系统的同频共存问题,构建了“地对地”“空对地”“地对空”3类典型干扰场景的...针对无需对用户终端硬件进行改动,仅通过网络侧适配即可实现直连卫星的存量手机直连卫星系统与国际移动通信(International Mobile Telecommunications,IMT)系统的同频共存问题,构建了“地对地”“空对地”“地对空”3类典型干扰场景的建模与仿真框架,并基于S频段系统参数,结合挖洞式拓扑与蒙特卡洛仿真方法,评估了不同场景下的干扰程度与所需隔离条件。结果表明,“地对地”干扰场景中,卫星终端对IMT基站的干扰需约5 km地理隔离,IMT基站对卫星终端的干扰需约15 km地理隔离;“空对地”场景在波位直径30 km配置下,需约120 km隔离距离;“地对空”场景中,若IMT用户以23 dBm最大发射,超限占比约65%,按平均功率并配合波位隔离可降至门限内。提出的建模与仿真方法为星地系统干扰分析与频率协调提供了参考。展开更多
频率选择是开展手机直连卫星发星工作的首要问题,也是发星的技术基础。为此,对手机直连卫星通信频率选择进行分析研究,先从政策、国内外协调层面分析国际移动通信(International Mobile Telecommunications,IMT)频率用于手机直连卫星的...频率选择是开展手机直连卫星发星工作的首要问题,也是发星的技术基础。为此,对手机直连卫星通信频率选择进行分析研究,先从政策、国内外协调层面分析国际移动通信(International Mobile Telecommunications,IMT)频率用于手机直连卫星的可行性,再从技术层面研究IMT频率的星间互调及星地干扰影响。通过完善用频方案,为开展不同轨位手机直连卫星的应用提供高可靠性、高可用度的选频思路,这对加快手机直连卫星系统建设具有重要意义。展开更多
文摘In order to satisfy the spectrum requirements of the future international mobile telecommunication (IMT) systems, to realize scientific allocation and usage of spectrum resources and to avoid spectrum waste brought by allocation in advanced, there is a need to make a reasonable estimation for the spectrum demands of future IMT systems. The estimation results can also provide guidelines for the subsequent spectrum planning and assignment work. This paper gives a description of study progress of related spectrum estimation for future IMT systems. From the analysis of current work and practical situation, the key factors in the estimation methodology are summarized to provide a reference for the following work.
文摘频率选择是开展手机直连卫星发星工作的首要问题,也是发星的技术基础。为此,对手机直连卫星通信频率选择进行分析研究,先从政策、国内外协调层面分析国际移动通信(International Mobile Telecommunications,IMT)频率用于手机直连卫星的可行性,再从技术层面研究IMT频率的星间互调及星地干扰影响。通过完善用频方案,为开展不同轨位手机直连卫星的应用提供高可靠性、高可用度的选频思路,这对加快手机直连卫星系统建设具有重要意义。
