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.
报告人简介：
严杭松，纽约大学博士，现任西安电子科技大学杭州研究院副研究员。曾就职于上海华为技术有限公司，并拥有诺基亚贝尔实验室与英特尔实验室的研发经历。主要研究方向为低轨卫星通信下的MIMO研究，全息MIMO下的连续至离散信道建模与电磁信息论容量研究。在通信和信号处理领域国际知名期刊和会议上发表学术论文20余篇，长期担任上述期刊及会议的审稿人及TPC会员，并获评IEEE TCOM与WCL模范审稿人。申请与授权发明专利5项。在华为工作期间，主导与参与多项5G物理层关键技术的研发与商用落地，获5G & LTE FDD领域总裁奖、华为明日之星等奖项。
