[1]  Qingchao Li, Mohammed El-Hajjar, Yanshi Sun, Lajos Hanzo, “Performance Analysis of Reconfigurable Holographic Surfaces in the Near-Field Scenario of Cell-Free Networks Under Hardware Impairments” [J]. IEEE Transactions on Wireless Communications, 2024, 23(9): 11972-11984.

[2]  Qingchao Li, Mohammed El-Hajjar, Kaijun Cao, Chao Xu, Harald Haas, Lajos Hanzo, “Holographic Metasurface-Based Beamforming for Multi-Altitude LEO Satellite Networks” [J]. IEEE Transactions on Wireless Communications, 2025.

[3]  Qingchao Li, Mohammed El-Hajjar, Yanshi Sun, Ibrahim Hemadeh, Arman Shojaeifard, Yuanwei Liu, Lajos Hanzo, “Achievable Rate Analysis of the STAR-RIS Aided NOMA Uplink in the Face of Imperfect CSI and Hardware Impairments” [J]. IEEE Transactions on Communications, 2023, 71(10): 6100-6114.

[4]  Qingchao Li, Mohammed El-Hajjar, Yanshi Sun, Ibrahim Hemadeh, Arman Shojaeifard, Lajos Hanzo, “Energy-Efficient Reconfigurable Holographic Surfaces Operating in the Presence of Realistic Hardware Impairments” [J]. IEEE Transactions on Communications, 2024, 72(8): 5226-5238.

[5]  Qingchao Li, Mohammed El-Hajjar, Chao Xu, Jiancheng An, Chau Yune, Lajos Hanzo, “Stacked Intelligent Metasurfaces for Holographic MIMO Aided Cell-Free Networks” [J]. IEEE Transactions on Communications, 2024, 72(11): 7139-7151.

[6]  Qingchao Li, Mohammed El-Hajjar, Lajos Hanzo, “Ergodic Spectral Efficiency Analysis of Intelligent Omni-Surface Aided Systems Suffering From Imperfect CSI and Hardware Impairments” [J]. IEEE Transactions on Communications, 2024, 72(8): 5073-5086.

[7]  Qingchao Li, Mohammed El-Hajjar, Chao Xu, Jiancheng An, Chau Yuen, Lajos Hanzo, “Stacked Intelligent Metasurface-Based Transceiver Design for Near-Field Wideband Systems” [J]. IEEE Transactions on Communications, 2025.

[8]  Qingchao Li, Mohammed El-Hajjar, Ibrahim Hemadeh, Deepa Jagyasi, Arman Shojaeifard, Ertugrul Basar, and Lajos Hanzo, “The Reconfigurable Intelligent Surface-Aided Multi-Node IoT Downlink: Beamforming Design and Performance Analysis” [J], IEEE Internet of Things Journal, 2023, 10(7): 6400-6414.

[9]  Qingchao Li, Mohammed El-Hajjar, Ibrahim Hemadeh, Arman Shojaeifard, Alain A. M. Mourad, Bruno Clerckx, Lajos Hanzo. “Reconfigurable Intelligent Surfaces Relying on Non-Diagonal Phase Shift Matrices” [J]. IEEE Transactions on Vehicular Technology, 2022, 71(6): 6367-6383.

[10]     Qingchao Li, Mohammed El-Hajjar, Ibrahim Hemadeh, Deepa Jagyasi, Arman Shojaeifard, Lajos Hanzo, “Performance Analysis of Active RIS-aided Systems in the Face of Imperfect CSI and Phase Shift Noise” [J]. IEEE Transactions on Vehicular Technology, 2023, 72(6): 8140-8145.

[11]     Qingchao Li, Mohammed El-Hajjar, Ibrahim Hemadeh, Arman Shojaeifard, Alain A. M. Mourad, Lajos Hanzo, “Reconfigurable Intelligent Surface Aided Amplitude- and Phase-Modulated Downlink Transmission” [J]. IEEE Transactions on Vehicular Technology, 2023, 72(6): 8146-8151.

[12]     Qingchao Li, Mohammed El-Hajjar, Ibrahim Hemadeh, Arman Shojaeifard, Lajos Hanzo, “Low-Overhead Channel Estimation for RIS-Aided Multi-Cell Networks in the Presence of Phase Quantization Errors” [J]. IEEE Transactions on Vehicular Technology, 2024, 73(5): 6626-6641.

[13]     Qingchao Li, Mohammed El-Hajjar, Yanshi Sun, Ibrahim Hemadeh, Arman Shojaeifard, Lajos Hanzo, “Achievable Rate Analysis for Intelligent Omni-Surfaces Assisted NOMA Holographic MIMO Systems” [J]. IEEE Transactions on Vehicular Technology, 2024, 73(5): 7400 -7405.

[14]     Qingchao Li, Mohammed El-Hajjar, Ibrahim Hemadeh, Arman Shojaeifard, Lajos Hanzo, “Coordinated Reconfigurable Intelligent Surfaces: Non-Diagonal Group-Connected Design” [J]. IEEE Transactions on Vehicular Technology, 2024, 73(7): 10811-10816.

[15]     Yinuo Dong, Qingchao Li, Soon Xin Ng, Mohammed El-Hajjar, “Reconfigurable Intelligent Surface Relying on Low-complexity Joint Sector Non-diagonal Structure” [J]. IEEE Open Journal of Vehicular Technology, 2024, 5: 1106-1123.

[16]     Qingchao Li, Mohammed El-Hajjar, Ibrahim Hemadeh, Arman Shojaeifard, Lajos Hanzo, “Low-Complexity Channel Estimation for RIS-Assisted Multi-User Wireless Communications” in Proceedings of the IEEE International Conference on Communications (ICC), Jun. 2025, (Accepted on 18^th Jan 2025).

[17]     I. Hemadeh, Qingchao Li, M. El-Hajjar, A. A. M. Mourad, A. Shojaeifard, “Off-diagonal beamforming and fully connected reconfigurable intelligent surfaces”, U. S. Patent Publication No. WO2022251315A1, December 1, 2022.

[18]     I. Hemadeh, Y. Tsai, Qingchao Li, M. El-Hajjar, A. Shojaeifard, D. Jagyasi, “Reconfigurable Intelligent Surface/Reconfigurable Holographic Surface-based Joint Precoding, Beamforming and Modulation”, U. S. Patent Publication No. WO2024049801A1, March 7, 2024.

[19]     I. Hemadeh, A. Tsai, A. Shojaeifard, D. Jagyasi, Qingchao Li, Mohammed El-hajjar, Lajos Hanzo, “Reconfigure intelligent surface (RIS) based beamforming and/or modulation”, U. S. Patent No. US20240171447A1, May 23, 2024.