26 citations · 48 across the 28 of their papers we have counts for
32 papers
Digital Twin Networks for 6G Wireless Systems: Architecture, Enabling Technologies, Intelligent Control, and Open Challenges
Charalampos Oikonomidis, Emmanouel T. Michailidis, Nikolaos I. Miridakis
The transition to the Sixth Generation (6G) of mobile networks requires proactive and deterministic orchestration to satisfy the stringent key performance indicators of future serv…
Spatially Correlated multi-RIS Communication: The Effect of Inter-Operator Interference
Nikolaos I. Miridakis, Panagiotis A. Karkazis
A multi-operator wireless communication system is studied where each operator is equipped with a reconfigurable intelligent surface (RIS) to enhance its communication quality. RISs…
Impact of Inter-Operator Interference via Reconfigurable Intelligent Surfaces
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Panagiotis A. Karkazis +2
A wireless communication system is studied that operates in the presence of multiple reconfigurable intelligent surfaces (RISs). In particular, a multi-operator environment is cons…
Extreme Level Crossing Rate: A New Performance Indicator for URLLC Systems
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Panagiotis A. Karkazis +2
Level crossing rate (LCR) is a well-known statistical tool that is related to the duration of a random stationary fading process \emph{on average}. In doing so, LCR cannot capture…
Zero Forcing Uplink Detection through Large-Scale RIS: System Performance and Phase Shift Design
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Rugui Yao
A multiple-input multiple-output wireless communication system is analytically studied, which operates with the aid of a large-scale reconfigurable intelligent surface (LRIS). LRIS…
Outage Performance of Cross-Packet HARQ
Jiahui Feng, Zheng Shi, Guanghua Yang +3
As opposed to hybrid automatic repeat request with incremental redundancy (HARQ-IR) that all the resources are occupied to resend the redundant information, cross-packet HARQ (XP-H…
Extreme Age of Information for Wireless-Powered Communication Systems
Nikolaos I. Miridakis, Zheng Shi, Theodoros A. Tsiftsis +1
The extreme or maximum age of information (AoI) is analytically studied for wireless communication systems. In particular, a wireless powered single-antenna source node and a recei…
Non-Linear Age of Information: An Energy Efficient Receiver-Centric Approach
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Guanghua Yang
The age of information (AoI) performance metric for point-to-point wireless communication systems is analytically studied under Rician-faded channels and when the receiver is equip…
Semi-Blind Multiuser Detection Under the Presence of Reconfigurable Intelligent Surfaces
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Guanghua Yang +2
A multiuser multiple-input multiple-output wireless communication system is analytically studied, which operates with the aid of a reconfigurable intelligent surface (RIS). The int…
Performance of Uplink NOMA with User Mobility Under Short Packet Transmission
Nikolaos I. Miridakis, Emmanouel T. Michailidis, Angelos Michalas +3
The scenario of an uplink two-user non-orthogonal multiple access (NOMA) communication system is analytically studied when it operates in the short packet transmission regime. The…
Energy Optimization in Massive MIMO UAV-Aided MEC-Enabled Vehicular Networks
Emmanouel T. Michailidis, Nikolaos I. Miridakis, Angelos Michalas +3
This paper presents a novel unmanned aerial vehicle (UAV) aided mobile edge computing (MEC) architecture for vehicular networks. It is considered that the vehicles should complete…
Generalized Energy Detection Under Generalized Noise Channels
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Guanghua Yang
Generalized energy detection (GED) is analytically studied when operates under fast-faded channels and in the presence of generalized noise. For the first time, the McLeish distrib…
Moment-based Spectrum Sensing Under Generalized Noise Channels
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Guanghua Yang
A new spectrum sensing detector is proposed and analytically studied, when it operates under generalized noise channels. Particularly, the McLeish distribution is used to model the…
Metasurface-Coated Devices: A New Paradigm for Energy-Efficient and Secure 6G Communications
Theodoros A. Tsiftsis, Constantinos Valagiannopoulos, Hongwu Liu +2
The sixth-generation (6G) era comes with the challenge of offering highly energy-efficient and autonomous communications securely. In this direction, we report energy efficiency (E…
Air-to-Air Communications Beyond 5G: A Novel 3D CoMP Transmission Scheme
Yan Li, Nikolaos I. Miridakis, Theodoros A. Tsiftsis +2
In this paper, a novel D cellular model consisting of aerial base stations (aBSs) and aerial user equipments (aUEs) is proposed, by integrating the coordinated multi-point (CoMP…
Traffic-aware Two-stage Queueing Communication Networks: Queue Analysis and Energy Saving
Nan Qi, Nikolaos I. Miridakis, Ming Xiao +3
To boost energy saving for the general delay-tolerant IoT networks, a two-stage and single-relay queueing communication scheme is investigated. Concretely, a traffic-aware -thre…
Zero Forcing Detection For Short Packet Transmission Under Channel Estimation Errors
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Hui-Ming Wang
A multiuser multiple-input multiple-output wireless communication system is analytically studied under the short-packet transmission regime. The practical scenario of channel estim…
All-Optical FSO Relaying Under Mixture-Gamma Fading Channels and Pointing Errors
Nikolaos I. Miridakis, Dimitrios D. Vergados, Angelos Michalas
The performance of all-optical dual-hop relayed free-space optical communication systems is analytically studied and evaluated. We consider the case when the total received signal…
A New Interweave Cognitive Radio Scheme for Out-band Energy Harvesting Systems
Nikolaos I. Miridakis, Theodoros A. Tsiftsis
In this paper, a new interweave cognitive radio (CR) transmission scheme is analytically presented for energy harvesting (EH)-enabled transmitting nodes. EH is performed via a dedi…
MIMO Underlay Cognitive Radio: Optimized Power Allocation, Effective Number of Transmit Antennas and Harvest-Transmit Tradeoff
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, George C. Alexandropoulos
In this paper, the performance of an underlay multiple-input multiple-output (MIMO) cognitive radio system is analytically studied. In particular, the secondary transmitter operate…
All Cognitive MIMO: A New Multiuser Detection Approach with Different Priorities
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Dimitrios D. Vergados +1
A new detection scheme for multiuser multiple-input multiple-output (MIMO) systems is analytically presented. In particular, the transmitting users are being categorized in two dis…
EGC Reception for FSO Systems Under Mixture-Gamma Fading Channels and Pointing Errors
Nikolaos I. Miridakis, Theodoros A. Tsiftsis
The performance of equal gain combining reception at free-space optical communication systems is analytically studied and evaluated. We consider the case when the total received si…
Distributed Spatial Multiplexing Systems with Hardware Impairments and Imperfect Channel Estimation under Rank- Rician Fading Channels
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Corbett Rowell
The performance of a multiuser communication system with single-antenna transmitting terminals and a multi-antenna base-station receiver is analytically investigated. The system op…
On the Joint Impact of Hardware Impairments and Imperfect CSI on Successive Decoding
Nikolaos I. Miridakis, Theodoros A. Tsiftsis
In this paper, a spatial multiplexing multiple-input multiple-output (MIMO) system when hardware along with RF imperfections occur during the communication setup is analytically in…