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In space-air-ground integrated networks (SAGIN), receivers experience diverseinterference from both the satellite and terrestrial transmitters. Theheterogeneous structure of SAGIN poses challenges for traditional interferencemanagement (IM) schemes to effectively mitigate interference. To address this,a novel UAV-RIS-aided IM scheme is proposed for SAGIN, where different types ofchannel state information (CSI) including no CSI, instantaneous CSI, anddelayed CSI, are considered. According to the types of CSI, interferencealignment, beamforming, and space-time precoding are designed at the satelliteand terrestrial transmitter side, and meanwhile, the UAV-RIS is introduced forcooperating interference elimination process. Additionally, the degrees offreedom (DoF) obtained by the proposed IM scheme are discussed in depth whenthe number of antennas on the satellite side is insufficient. Simulationresults show that the proposed IM scheme improves the system capacity indifferent CSI scenarios, and the performance is better than the existing IMbenchmarks without UAV-RIS.

UAV-RIS-Aided Space-Air-Ground Integrated Network: Interference Alignment Design and DoF Analysis