摘要
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。
This study addresses the co-channel coexistence between existing direct-to-cell satellite systems-requiring no hardware modifications at the user terminal and enabled solely through network-side adaptation-and International Mobile Telecommunications(IMT)systems.A modeling and simulation framework is constructed for three typical interference scenarios:terrestrial-to-terrestrial,space-to-terrestrial,and terrestrial-to-space.Based on S-band system parameters and combining a hole-punch topology with Monte Carlo simulation,the interference levels and required isolation conditions are evaluated for different scenarios.The results show that,in the terrestrial-to-terrestrial scenario,interference from satellite terminals to IMT base stations requires about 5 km of geographic separation,while interference from IMT base stations to satellite terminals requires about 15 km;in the space-to-terrestrial scenario,under a beam spot diameter of 30 km,an isolation distance of about 120 km is needed;in the terrestrial-to-space scenario,if IMT users transmit at a maximum power of 23 dBm,the exceedance ratio is about 65%,which can be reduced to within the threshold by using average power together with beam isolation.The proposed modeling and simulation method provides a reference for interference analysis and frequency coordination between space and terrestrial systems.
作者
李伟
张锦峰
吕俊璋
李勇
韦升坤
LI Wei;ZHANG Jinfeng;LYU Junzhang;LI Yong;WEI Shengkun(School of Information and Communication Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China;State Radio Monitoring Center,Beijing 100037,China)
出处
《无线电工程》
2025年第12期2409-2417,共9页
Radio Engineering
基金
北京市自然科学基金(L222003)
国家重点研发计划青年科学家项目(2024YFB2907600)。
关键词
手机直连卫星
频率兼容共存
干扰分析
国际移动通信系统
存量终端
direct-to-cell satellite
frequency compatibility and coexistence
interference analysis
IMT system
legacy terminals
