空间信息网络中面向双卫星的频谱共享方法

认知无线电能为缓解空间信息网络中日益增长的服务需求与紧张的频谱资源之间的矛盾提供有效的解决途径。论文针对静止轨道卫星系统和低轨道卫星系统提出一种基于频率动态分配的频谱共享方法。基于用户信号质量最差场景的干扰分析，定义波束隔离区域以避免同频干扰。此外，针对卫星运动引起的时空动态性，通过卫星星历、频率配置方案以及天线方向图等共享信息来预测可能出现的干扰，在此基础上提出频率动态分配算法来实现频谱共享。仿真结果表明，频谱共享方法在保护主用户的同时可有效提高次级用户的信号质量。

Spectrum sharing method for dual satellite in space information network

Cognitive radio is a promising solution to address the conflict between the continuously increasing service and the spectrum scarcity in space information network. In this context, we propose a novel cognitive multibeam satellite network with geostationary earth orbit and low earth orbit satellites. Based on the interference analysis of the user signal quality in the worst case, a keep-out region of the beam is defined to avoid the co-channel interference. In addition, the shared information such as satellite ephemeris, frequency configuration scheme, and antenna pattern is used to predict the interference that may occur. Then, a dynamic frequency allocation algorithm is presented to deal with the dynamic configuration caused by satellite motion. Numerical results demonstrate that the spectrum-sharing method can simultaneously enhance the signal quality of the secondary system and protect the primary system.