This work focuses on a dual satellite system (DSS) where two multiple spot beam geosynchronous satellites transmit simultaneously on the same frequency across all spot beams. The intra-satellite co-channel interference is managed through precoding, while the inter-satellite co-channel interference is managed with successive interference cancellation (SIC) at the user terminals. The SIC eliminates the strongest co-channel interference from an adjacent satellite while treating the remaining interfering signals as noise. The power required at the transmitter to achieve the desired data rate is formulated as a semidefinite programming problem and relaxed rank constraints. The SIC-based receivers are shown to achieve a better data rate than traditional detectors that treat co-channel interference as noise while saving transmit power at the satellites. Though SIC-based DSS achieves better throughput than a single satellite system, the receiver complexity is high. A high-altitude pseudo satellite (HAPS) aided DSS is proposed to address this issue. In the case of HAPS-aided DSS, users within each spot beam are served by a HAPS, and the HAPSs use SIC to detect signals from satellites. The user terminals in HAPS-aided DSS can use simple detectors as HAPS eliminates co-channel interference through precoding. The full-duplex HAPS-aided DSS is shown to outperform SIC-based DSS.

这项工作侧重于双卫星系统 (DSS)，其中两颗多点波束地球同步卫星在所有点波束上以相同频率同时传输。卫星内同信道干扰通过预编码进行管理，而卫星间同信道干扰通过用户终端的连续干扰消除（SIC）进行管理。SIC 消除了来自相邻卫星的最强同信道干扰，同时将剩余的干扰信号视为噪声。发射机实现所需数据速率所需的功率被公式化为半定规划问题和宽松的秩约束。与传统检测器相比，基于 SIC 的接收器可实现更好的数据速率，传统检测器将同信道干扰视为噪声，同时节省卫星传输功率。尽管基于 SIC 的 DSS 实现了比单个卫星系统更好的吞吐量，但接收器的复杂性很高。提出了一种高空伪卫星（HAPS）辅助 DSS 来解决这个问题。在 HAPS 辅助 DSS 的情况下，每个点波束内的用户由 HAPS 服务，HAPS 使用 SIC 检测来自卫星的信号。HAPS 辅助 DSS 中的用户终端可以使用简单的检测器，因为 HAPS 通过预编码消除了同信道干扰。全双工 HAPS 辅助 DSS 表现优于基于 SIC 的 DSS。HAPS 使用 SIC 来检测来自卫星的信号。HAPS 辅助 DSS 中的用户终端可以使用简单的检测器，因为 HAPS 通过预编码消除了同信道干扰。全双工 HAPS 辅助 DSS 表现优于基于 SIC 的 DSS。HAPS 使用 SIC 来检测来自卫星的信号。HAPS 辅助 DSS 中的用户终端可以使用简单的检测器，因为 HAPS 通过预编码消除了同信道干扰。全双工 HAPS 辅助 DSS 表现优于基于 SIC 的 DSS。