125 citations · 234 across the 21 of their papers we have counts for
22 papers
Technical Report OFDM-Assisted Simultaneous Quantum and Classical THz Communications
Xin Liu, Chao Xu, Soon Xin Ng +4
The feasibility of cost-effective simultaneous quantum and classical communication (SQCC) transmitting both the quantum key and classical information via a superimposed coherent st…
OTFS-IM-Assisted Non-Terrestrial Networks Relying on Autoencoder-Aided Soft-Decision Detection
Xinyu Feng, Chao Zhang, Mohammed EL-Hajjar +2
Orthogonal Time Frequency Space ({OTFS}) modulation offers significant advantages over Orthogonal Frequency Division Multiplexing ({OFDM}), particularly in high speed environments.…
Amalgamated CHIRP and OFDM for ISAC
Pankaj Kumar, Mohammed El-Hajjar, Ibrahim A. Hemadeh +4
Integrated Sensing and Communication (ISAC) requires the development of a waveform capable of efficiently supporting both communication and sensing functionalities. This paper prop…
Augmented Affine Frequency Division Multiplexing for Both Low PAPR Signaling and Diversity Gain Protection
Zhou Lu, Mohammed El-Hajjar, Lie-liang Yang
Research results on Affine Frequency Division Multiplexing (AFDM) reveal that it experiences the same Peak-to-Average Power Ratio (PAPR) problem as conventional Orthogonal Frequenc…
Graph Neural Network Aided Detection for the Multi-User Multi-Dimensional Index Modulated Uplink
Xinyu Feng, Mohammed EL-Hajjar, Chao Xu +1
The concept of Compressed Sensing-aided Space-Frequency Index Modulation (CS-SFIM) is conceived for the Large-Scale Multi-User Multiple-Input Multiple-Output Uplink (LS-MU-MIMO-UL)…
Stacked Intelligent Metasurface-Based Transceiver Design for Near-Field Wideband Systems
Qingchao Li, Mohammed El-Hajjar, Chao Xu +3
Intelligent metasurfaces may be harnessed for realizing efficient holographic multiple-input and multiple-output (MIMO) systems, at a low hardware-cost and high energy-efficiency.…
Low-Complexity Channel Estimation for RIS-Assisted Multi-User Wireless Communications
Qingchao Li, Mohammed El-Hajjar, Ibrahim Hemadeh +2
Reconfigurable intelligent surfaces (RISs) are eminently suitable for improving the reliability of wireless communications by jointly designing the active beamforming at the base s…
Holographic Metasurface-Based Beamforming for Multi-Altitude LEO Satellite Networks
Qingchao Li, Mohammed El-Hajjar, Kaijun Cao +3
Low Earth Orbit (LEO) satellite networks are capable of improving the global Internet service coverage. In this context, we propose a hybrid beamforming design for holographic meta…
Stacked Intelligent Metasurfaces for Holographic MIMO Aided Cell-Free Networks
Qingchao Li, Mohammed El-Hajjar, Chao Xu +3
Large-scale multiple-input and multiple-output (MIMO) systems are capable of achieving high date rate. However, given the high hardware cost and excessive power consumption of mass…
Ergodic Spectral Efficiency Analysis of Intelligent Omni-Surface Aided Systems Suffering From Imperfect CSI and Hardware Impairments
Qingchao Li, Mohammed El-Hajjar, Lajos Hanzo
In contrast to the conventional reconfigurable intelligent surfaces (RIS), intelligent omni-surfaces (IOS) are capable of full-space coverage of smart radio environments by simulta…
Performance Analysis of Reconfigurable Holographic Surfaces in the Near-Field Scenario of Cell-Free Networks Under Hardware Impairments
Qingchao Li, Mohammed El-Hajjar, Yanshi Sun +1
We propose a hybrid beamforming architecture for near-field reconfigurable holographic surfaces (RHS) harnessed in cell-free networks. Specifically, the holographic beamformer of e…
Energy-Efficient Reconfigurable Holographic Surfaces Operating in the Presence of Realistic Hardware Impairments
Qingchao Li, Mohammed El-Hajjar, Yanshi Sun +3
Reconfigurable holographic surfaces (RHSs) constitute a promising technique of supporting energy-efficient communications. In this paper, we formulate the energy efficiency maximiz…
Achievable Rate Analysis of Intelligent Omni-Surface Assisted NOMA Holographic MIMO Systems
Qingchao Li, Mohammed El-Hajjar, Yanshi Sun +4
An intelligent omni-surface (IOS) assisted holographic multiple-input and multiple-output architecture is conceived for full-space coverage at a low energy consumption.…
Localization in Reconfigurable Intelligent Surface Aided mmWave Systems: A Multiple Measurement Vector Based Channel Estimation Method
Kunlun Li, Jiguang He, Mohammed El-Hajjar +1
The sparsity of millimeter wave (mmWave) channels in the angular and temporal domains is beneficial to channel estimation, while the associated channel parameters can be utilized f…
Achievable Rate Analysis of the STAR-RIS Aided NOMA Uplink in the Face of Imperfect CSI and Hardware Impairments
Qingchao Li, Mohammed El-Hajjar, Yanshi Sun +4
Reconfigurable intelligent surfaces (RIS) are capable of beneficially ameliorating the propagation environment by appropriately controlling the passive reflecting elements. To exte…
Reconfigurable Intelligent Surface Aided Amplitude- and Phase-Modulated Downlink Transmission
Qingchao Li, Mohammed El-Hajjar, Ibrahim Hemadeh +3
New reconfigurable intelligent surface (RIS) based amplitude and phase modulation schemes are proposed as an evolution how the phase-only modulation schemes available in the litera…
Performance Analysis of Active RIS-aided Systems in the Face of Imperfect CSI and Phase Shift Noise
Qingchao Li, Mohammed El-Hajjar, Ibrahim Hemadeh +3
The linear minimal mean square error (LMMSE) estimator for active reconfigurable intelligent surface (RIS)-aided wireless systems is formulated. Furthermore, based on the moment-ma…
Reconfigurable Intelligent Surfaces Relying on Non-Diagonal Phase Shift Matrices
Qingchao Li, Mohammed El-Hajjar, Ibrahim Hemadeh +4
Reconfigurable intelligent surfaces (RIS) have been actively researched as a potential technique for future wireless communications, which intelligently ameliorate the signal propa…
Analogue Radio over Fiber aided Multi-service Communications for High Speed Trains
Yichuan Li, Salman Ghafoor, Mohammed El-Hajjar
High speed trains (HST) have gradually become an essential means of transportation, where given our digital world, it is expected that passengers will be connected all the time. Mo…
Analogue Radio Over Fiber for Next-Generation RAN: Challenges and Opportunities
Yichuan Li, Qijie Xie, Mohammed El-Hajjar +1
The radio access network (RAN) connects the users to the core networks, where typically digitised radio over fiber (D-RoF) links are employed. The data rate of the RAN is limited b…
Intermittent Opportunistic Routing Components for the INET Framework
Edward Longman, Mohammed El-Hajjar, Geoff V. Merrett
Intermittently-powered wireless sensor networks (WSNs) use energy harvesting and small energy storage to remove the need for battery replacement and to extend the operational lifet…
Analysis of Network Coding Schemes for Differential Chaos Shift Keying Communication System
Georges Kaddoum, Mohammed El-Hajjar
In this paper we design network coding schemes for Differential Chaos Shift Keying (DCSK) modulation. In this work, non-coherent chaos-based communication system is used due to its…