Time：2026.07.30 9:30am
Location: Wireless Valley A1319
Speaker: Hangsong Yan
Abstract：
Low Earth orbit (LEO) satellite communication is rapidly evolving as an indispensable component of next-generation global connectivity. However, conventional single-satellite architectures face fundamental physical limitations, particularly the inherent rank-1 channel degradation, which restricts the system to single-stream transmission. Multi-satellite cooperation has emerged as a transformative architecture to overcome this bottleneck, artificially constructing spatial multipath to unlock multi-stream spatial multiplexing. Despite its potential, transitioning to distributed satellite clusters introduces extreme asynchronous reception challenges, including severe propagation delay differentials, phase offsets, and inter-symbol interference, which critically degrade system performance.
In this talk, we provide a comprehensive overview of physical layer designs for LEO multi-satellite cooperative networks, spanning from practical interference mitigation to the evolution of antenna apertures. We first present the asynchronous signal models and highlight the fundamental challenges of multi-satellite transmission. Next, we introduce practical solutions by developing a low-complexity, robust precoding framework based on statistical channel state information (sCSI), demonstrating significant performance gains under various practical power constraints. Furthermore, to fully unleash the spatial degrees of freedom in future satellite networks, we extend our vision to Holographic MIMO (HMIMO) technologies. We delve into the fundamental electromagnetic constraints of continuous apertures and present a rigorous continuous-to-discrete channel modeling paradigm designed for complex, non-isotropic physical fields. Finally, we outline promising research directions for future satellite communication networks.
