10 citations · 33 across the 23 of their papers we have counts for
23 papers
UAV-Assisted 5G Networks: Mobility-Aware 3D Trajectory Optimization and Resource Allocation for Dynamic Environments
Asad Mahmood, Thang X. Vu, Wali Ullah Khan +2
This work proposes a framework for the robust design of UAV-assisted wireless networks that combine 3D trajectory optimization with user mobility prediction to address dynamic reso…
Survey on Beyond Diagonal RIS Enabled 6G Wireless Networks: Fundamentals, Recent Advances, and Challenges
Wali Ullah Khan, Manzoor Ahmed, Chandan Kumar Sheemar +7
Beyond Diagonal Reconfigurable Intelligent Surfaces (BD-RIS) represent a groundbreaking innovation in sixth-generation (6G) wireless networks, enabling unprecedented control over w…
Secrecy Rate Maximization for 6G Reconfigurable Holographic Surfaces Assisted Systems
Chandan Kumar Sheemar, Wali Ullah Khan, Marco di Renzo +3
Reconfigurable holographic surfaces (RHS) have emerged as a transformative material technology, enabling dynamic control of electromagnetic waves to generate versatile holographic…
Joint Beamforming and 3D Location Optimization for Multi-User Holographic UAV Communications
Chandan Kumar Sheemar, Asad Mahmood, Christo Kurisummoottil Thomas +4
This paper pioneers the field of multi-user holographic unmanned aerial vehicle (UAV) communications, laying a solid foundation for future innovations in next-generation aerial wir…
Holographic MIMO for Next Generation Non-Terrestrial Networks: Motivation, Opportunities, and Challenges
Giovanni Iacovelli, Chandan Kumar Sheemar, Wali Ullah Khan +4
In this article, we propose the integration of the Holographic Multiple Input Multiple Output (HMIMO) as a transformative solution for next generation Non-Terrestrial Networks (NTN…
Integration of Beyond Diagonal RIS and UAVs in 6G NTNs: Enhancing Aerial Connectivity
Wali Ullah Khan, Eva Lagunas, Asad Mahmood +3
The reconfigurable intelligent surface (RIS) technology shows great potential in sixth-generation (6G) terrestrial and non-terrestrial networks (NTNs) since it can effectively chan…
CR-Enabled NOMA Integrated Non-Terrestrial IoT Networks with Transmissive RIS
Wali Ullah Khan, Zain Ali, Asad Mahmood +3
This work proposes a T-RIS-equipped LEO satellite communication in cognitive radio-enabled integrated NTNs. In the proposed system, a GEO satellite operates as a primary network, a…
Beyond Diagonal RIS for 6G Non-Terrestrial Networks: Potentials and Challenges
Wali Ullah Khan, Asad Mahmood, Muhammad Ali Jamshed +3
Reconfigurable intelligent surface (RIS) has emerged as a promising technology in both terrestrial and non-terrestrial networks (NTNs) due to its ability to manipulate wireless env…
Enhancing Indoor and Outdoor THz Communications with Beyond Diagonal-IRS: Optimization and Performance Analysis
Asad Mahmood, Thang X. Vu, Symeon Chatzinotas +1
This work investigates the application of Beyond Diagonal Intelligent Reflective Surface (BD-IRS) to enhance THz downlink communication systems, operating in a hybrid: reflective a…
Joint Computation and Communication Resource Optimization for Beyond Diagonal UAV-IRS Empowered MEC Networks
Asad Mahmood, Thang X. Vu, Wali Ullah Khan +2
Recent advancements in 6G systems signal a leap towards universal connectivity and ultra-reliable, low-latency communications for real-time data devices. Yet, these advancements en…
Reconfigurable Intelligent Surfaces for 6G Non-Terrestrial Networks: Assisting Connectivity from the Sky
Wali Ullah Khan, Asad Mahmood, Chandan Kumar Sheemar +3
This paper studies the potential of RIS-integrated NTNs to revolutionize the next-generation connectivity. First, it discusses the fundamentals of RIS technology. Secondly, it delv…
Deep Reinforcement Learning for Backscatter Communications: Augmenting Intelligence in Future Internet of Things
Wali Ullah Khan, Eva Lagunas, Zain Ali +5
Backscatter communication (BC) technology offers sustainable solutions for next-generation Internet-of-Things (IoT) networks, where devices can transmit data by reflecting and adju…
Reconfigurable Intelligent Surfaces Enhanced NOMA D2D Communications Underlaying UAV Networks
Wali Ullah Khan, Eva Lagunas, Asad Mahmood +3
Device-to-device (D2D) communications offers high spectral efficiency, low energy consumption and transmission latency. However, one of the main limitations of D2D communications i…
RIS-Assisted Energy-Efficient LEO Satellite Communications with NOMA
Wali Ullah Khan, Eva Lagunas, Asad Mahmood +2
This paper proposes an energy-efficient RIS-assisted downlink NOMA communication for LEO satellite networks. The proposed framework simultaneously optimizes the transmit power of g…
Joint Optimization of 3D Placement and Radio Resource Allocation for per-UAV Sum Rate Maximization
Asad Mahmood, Thang X. Vu, Symeon Chatzinotas +1
Unmanned aerial vehicles (UAV) have emerged as a practical solution that provides on-demand services to users in areas where the terrestrial network is non-existent or temporarily…
Multi-Objective Optimization for 3D Placement and Resource Allocation in OFDMA-based Multi-UAV Networks
Asad Mahmood, Thang X. Vu, Shree Krishna Sharma +2
This work considers the orthogonal frequency division multiple access (OFDMA) technology that enables multiple unmanned aerial vehicles (multi-UAV) communication systems to provide…
Energy-Efficient RIS-Enabled NOMA Communication for 6G LEO Satellite Networks
Wali Ullah Khan, Eva Lagunas, Asad Mahmood +2
This paper proposes an energy-efficient RIS-enabled NOMA communication for LEO satellite networks. The proposed framework simultaneously optimizes the transmit power of ground term…
Opportunities for Intelligent Reflecting Surfaces in 6G-Empowered V2X Communications
Wali Ullah Khan, Asad Mahmood, Arash Bozorgchenani +7
This paper first describes the introduction of 6G-empowered V2X communications and IRS technology. Then it discusses different use case scenarios of IRS enabled V2X communications…
Rate Splitting Multiple Access for Next Generation Cognitive Radio Enabled LEO Satellite Networks
ali Ullah Khan, Zain Ali, Eva Lagunas +6
This paper proposes a cognitive radio enabled LEO SatCom using RSMA radio access technique with the coexistence of GEO SatCom network. In particular, this work aims to maximize the…
Integration of NOMA with Reflecting Intelligent Surfaces: A Multi-cell Optimization with SIC Decoding Errors
Wali Ullah Khan, Eva Lagunas, Asad Mahmood +3
Reflecting intelligent surfaces (RIS) has gained significant attention due to its high energy and spectral efficiency in next-generation wireless networks. By using low-cost passiv…
Backscatter-Aided NOMA V2X Communication under Channel Estimation Errors
Wali Ullah Khan, Muhammad Ali Jamshed, Asad Mahmood +3
Backscatter communications (BC) has emerged as a promising technology for providing low-powered transmissions in nextG (i.e., beyond 5G) wireless networks. The fundamental idea of…
When RIS Meets GEO Satellite Communications: A New Sustainable Optimization Framework in 6G
Wali Ullah Khan, Eva Lagunas, Asad Mahmood +2
Reflecting intelligent surfaces (RIS) is a low-cost and energy-efficient solution to achieve high spectral efficiency in sixth-generation (6G) networks. The basic idea of RIS is to…
Integration of Backscatter Communication with Multi-cell NOMA: A Spectral Efficiency Optimization under Imperfect SIC
Wali Ullah Khan, Eva Lagunas, Asad Mahmood +4
Future wireless networks are expected to connect large-scale low-powered communication devices using the available spectrum resources. Backscatter communications (BC) is an emergin…