Time：2026.07.30 10:30am
Location: Wireless Valley A1319
Speaker: Ke-Xin Li
Abstract：
Low-earth-orbit (LEO) satellite communications empowered by massive multiple-input multiple-output (MIMO) is expected to play a pivotal role in future global ubiquitous connectivity and 6G non-terrestrial networks. However, the practical deployment of massive MIMO in LEO systems faces two fundamental challenges: achieving high energy efficiency under stringent payload and power constraints, and ensuring reliable communications in the presence of intentional jamming and eavesdropping.
This talk presents two complementary physical-layer transmission techniques that address these challenges. First, an energy-efficient hybrid beamforming framework is introduced for uplink massive MIMO LEO satellite communications with multiple-antenna user terminals. By exploiting only long-term statistical channel state information, a tight closed-form upper bound on the energy efficiency is derived, enabling the joint design of hybrid precoders and receivers under practical fully-connected and partially-connected architectures. The proposed framework significantly reduces hardware cost and power consumption while maintaining near-optimal spectral efficiency. The second part of the talk focuses on highly reliable transmission for multi-satellite cooperative massive MIMO downlink communications in contested environments. Considering both jamming and eavesdropping attacks as well as the time-frequency asynchronous effects in multi-satellite systems, an ergodic sum secrecy rate optimization framework is developed. It is shown that single-stream transmission is optimal, which greatly simplifies the precoder design. Efficient algorithms are further proposed for cooperative precoding and jamming optimization, providing robust and secure communications against adversarial interference.
报告人简介：
李科新，西安电子科技大学杭州研究院准聘副教授。2016年于电子科技大学获通信工程专业学士学位，同年保送至东南大学移动通信国家重点实验室攻读博士学位，2022年获信息与通信工程专业博士学位，2019-2020年前往卢森堡大学安全、可靠与信任交叉学科中心（SnT）访问交流，2022-2025年就职于华为杭州研究所2012无线技术实验室，从事6G NTN技术预研。主要研究方向为低轨卫星MIMO通信、卫星抗干扰通信、随机接入等，近年来在国际期刊和会议上发表论文20余篇，入选IEEE通信学会评选的Best Readings in Satellite Mega Constellations论文2篇。在华为工作期间，以第一发明人申请6G专利34项。
