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Grant-Free NOMA-OTFS Paradigm: Enabling Efficient Ubiquitous Access for LEO Satellite Internet-of-Things


Sep 25, 2022
Xingyu Zhou, Zhen Gao, Jingjing Zhao, Juan Li, Pei Xiao, Symeon Chatzinotas, Derrick Wing Kwan Ng, Bjorn Ottersten

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Cooperative Hybrid Networks with Active Relays and RISs for B5G: Applications, Challenges, and Research Directions


Jun 23, 2022
Zaid Abdullah, Steven Kisseleff, Wallace Alves Martins, Gaojie Chen, Luca Sanguinetti, Konstantinos Ntontin, Anastasios Papazafeiropoulos, Symeon Chatzinotas, Bjorn Ottersten

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Energy Efficiency Optimization for Backscatter Enhanced NOMA Cooperative V2X Communications under Imperfect CSI


Feb 16, 2022
Wali Ullah Khan, Muhammad Ali Jamshed, Eva Lagunas, Symeon Chatzinotas, Xingwang Li, Bjorn Ottersten

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Backscatter-Aided NOMA V2X Communication under Channel Estimation Errors


Feb 03, 2022
Wali Ullah Khan, Muhammad Ali Jamshed, Asad Mahmood, Eva Lagunas, Symeon Chatzinotas, Bjorn Ottersten

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When RIS Meets GEO Satellite Communications: A New Optimization Framework in 6G


Feb 01, 2022
Wali Ullah Khan, Eva Lagunas, Asad Mahmood, Symeon Chatzinotas, Bjorn Ottersten

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* 6, 5, IEEE ICC 2022 

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Joint Optimization of Beam-Hopping Design and NOMA-Assisted Transmission for Flexible Satellite Systems


Oct 13, 2021
Anyue Wang, Lei Lei, Eva Lagunas, Ana I. Perez-Neira, Symeon Chatzinotas, Bjorn Ottersten

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Evolution of Non-Terrestrial Networks From 5G to 6G: A Survey


Jul 14, 2021
M. Mahdi Azari, Sourabh Solanki, Symeon Chatzinotas, Oltjon Kodheli, Hazem Sallouha, Achiel Colpaert, Jesus Fabian Mendoza Montoya, Sofie Pollin, Alireza Haqiqatnejad, Arsham Mostaani, Eva Lagunas, Bjorn Ottersten

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FedFog: Network-Aware Optimization of Federated Learning over Wireless Fog-Cloud Systems


Jul 04, 2021
Van-Dinh Nguyen, Symeon Chatzinotas, Bjorn Ottersten, Trung Q. Duong

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* 30 pages, 12 figures. This work has been submitted to the IEEE for possible publication. Copyright may be transferred without notice, after which this version may no longer be accessible 

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LEO Satellite Constellations for 5G and Beyond: How Will They Reshape Vertical Domains?


Jun 18, 2021
Shicong Liu, Zhen Gao, Yongpeng Wu, Derrick Wing Kwan Ng, Xiqi Gao, Kai-Kit Wong, Symeon Chatzinotas, Bjorn Ottersten

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* 4 figures, 1 table, accepted by Communications Magazine 

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