58 citations · 87 across the 16 of their papers we have counts for
17 papers
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.…
Shaping a Smarter Electromagnetic Landscape: IAB, NCR, and RIS in 5G Standard and Future 6G
Chao-Kai Wen, Lung-Sheng Tsai, Arman Shojaeifard +3
The main objective of 5G and beyond networks is to provide an optimal user experience in terms of throughput and reliability, irrespective of location and time. To achieve this, tr…
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…
Performance Limits of Fluid Antenna Systems
Kai-Kit Wong, Arman Shojaeifard, Kin-Fai Tong +1
Fluid antenna represents a concept where a mechanically flexible antenna can switch its location freely within a given space. Recently, it has been reported that even with a tiny s…
Fluid Antenna Systems
Kai-Kit Wong, Arman Shojaeifard, Kin-Fai Tong +1
Over the past decades, multiple antenna technologies have appeared in many different forms, most notably as multiple-input multiple-output (MIMO), to transform wireless communicati…
On the Ergodic Rate of OFDMA Cognitive Radios under Imperfect Cross-Link Information
H. Saki, A. Shojaeifard, M. M. Mahyari +1
The ergodic rate performance and limits of orthogonal frequency-division multiple access (OFDMA) cognitive radios (CRs) is studied under imperfect cross-link knowledge. We propose…
Full-Duplex Cloud Radio Access Network: Stochastic Design and Analysis
Arman Shojaeifard, Kai-Kit Wong, Wei Yu +2
Full-duplex (FD) has emerged as a disruptive communications paradigm for enhancing the achievable spectral efficiency (SE), thanks to the recent major breakthroughs in self-interfe…
Self-Interference in Full-Duplex Multi-User MIMO Channels
Arman Shojaeifard, Kai-Kit Wong, Marco Di Renzo +3
We consider a multi-user multiple-input multiple-output (MIMO) setup where full-duplex (FD) multi-antenna nodes apply linear beamformers to simultaneously transmit and receive mult…
Massive MIMO-Enabled Full-Duplex Cellular Networks
Arman Shojaeifard, Kai-Kit Wong, Marco Di Renzo +3
In this paper, we provide a theoretical framework for the study of massive multiple-input multiple-output (MIMO)-enabled full-duplex (FD) cellular networks in which the self-interf…
Energy Efficiency Optimization with Simultaneous Wireless Information and Power Transfer in MIMO Broadcast Channels
Jie Tang, Daniel K. C. So, Arman Shojaeifard +1
Simultaneous wireless information and power transfer (SWIPT) is anticipated to have great applications in fifth-generation (5G) and beyond communication systems. In this paper, we…
Joint Antenna Selection and Spatial Switching for Energy Efficient MIMO SWIPT System
Jie Tang, Daniel K. C. So, Arman Shojaeifard +2
In this paper, we investigate joint antenna selection and spatial switching (SS) for quality-of-service (QoS)-constrained energy efficiency (EE) optimization in a multiple-input mu…
Energy-Efficient Heterogeneous Cellular Networks with Spectrum Underlay and Overlay Access
Jie Tang, Daniel K. C. So, Emad Alsusa +3
In this paper, we provide joint subcarrier assignment and power allocation schemes for quality-of-service (QoS)-constrained energy-efficiency (EE) optimization in the downlink of a…
Stochastic Geometric Analysis of Energy-Efficient Dense Cellular Networks
Arman Shojaeifard, Kai-Kit Wong, Khairi Ashour Hamdi +3
Dense cellular networks (DenseNets) are fast becoming a reality with the rapid deployment of base stations (BSs) aimed at meeting the explosive data traffic demand. In legacy syste…