Title:Key Technologies of Large-scale MIMO Systems Assisted by Reconfigurable Intelligent Metasurfaces

Speaker:Dr. Li Qingchao

Affiliation:University of Southampton

Date:December 28, 2023 (Thursday)

Time:10:00-11:00 AM

Venue:Room 603, Jade Science and Education Building A

Lecture Abstract:

Future 6G networks need to provide communication services with high reliability, high data rates, and low latency. Communication in high-frequency bands such as millimeter waves and terahertz will become inevitable trends. However, high-frequency communication suffers from limited signal coverage, severe propagation attenuation, and high hardware precision requirements. Currently, Reconfigurable Intelligent Surfaces (RIS) are considered one of the solutions to overcome the drawbacks of high-frequency communication. Compared to traditional communication systems, RIS systems have the characteristics of improving channel environments, low power consumption, low hardware complexity, and high spectrum efficiency. However, the application of RIS still faces many technical challenges. This report will introduce the following aspects of large-scale MIMO systems based on RIS: (1) Low-complexity RIS channel estimation algorithms; (2) The impact of non-ideal hardware factors and channel estimation errors on system performance and how to improve them using algorithms; (3) Using non-diagonal phase matrix RIS structures to resist channel fading; (4) Beamforming design of RIS in Cell-free systems and theoretical analysis of channel capacity in near-field models.

Speaker's Bio:

Dr. Li Qingchao is a doctoral researcher at the University of Southampton's Next Generation Wireless Communications Laboratory. He received his bachelor's and master's degrees from the University of Science and Technology Beijing and the University of Science and Technology of China, respectively. From September 2017 to July 2020, he conducted theoretical research on "Molecular Communication Systems Based on Diffusion Mechanisms" at the University of Science and Technology of China. From September 2020 to December 2023, he participated in the "Intelligent Holographic Massive MIMO Transceiver Design" project funded by the Royal Academy of Engineering, UK, under the supervision of Professor Lajos Hanzo, conducting communication network optimization and performance theoretical analysis work on "Reconfigurable Intelligent Surface-based Massive MIMO Systems". He was awarded the 2022 National Excellent Self-funded Overseas Study Scholarship and the 2023 University of Southampton Doctoral Research Award. He has published 9 SCI papers as the first author (including 1 IEEE TCOM, 4 IEEE TVT, 1 IEEE IoT, 3 IEEE TNB). He has served as a reviewer for renowned international journals such as IEEE Transactions on Wireless Communications, IEEE Transactions on Communications, IEEE Transactions on Vehicular Technology, IEEE Wireless Communications Letters, IEEE Communications Letters, IEEE Sensors Journal, and IEEE Transactions on Knowledge and Data Engineering.