To implement secure communication among similar channels for satellite communications, a secure communication model based on collaboration with the interference relay of the satellite physical layer is proposed in this paper. Relay selection and power allocation are further studied to enhance the security performance of the satellite communication system based on the model. The relay selection standard under known instantaneous channel state information (CSI) and statistical CSI conditions is theoretically derived, thereby minimizing the secrecy outage probability(SOP). In addition, the power allocation factor is optimized based on the minimization of the SOP. Moreover, a power allocation method based on the statistical CSI is presented. The SOP performance of each relay selection criterion and power allocation scheme are analyzed.

中文翻译：

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相似信道之间卫星通信的物理层安全性增强：中继选择和功率分配

为了在卫星通信的相似信道之间实现安全通信，本文提出了一种基于与卫星物理层干扰中继协作的安全通信模型。基于该模型，进一步研究了中继选择和功率分配，以提高卫星通信系统的安全性能。从理论上推导已知瞬时信道状态信息（CSI）和统计CSI条件下的中继选择标准，从而使保密中断概率（SOP）最小。另外，基于SOP的最小化来优化功率分配因子。此外，提出了一种基于统计CSI的功率分配方法。分析了每个继电器选择标准和功率分配方案的SOP性能。