THEODOROS TSIFTSIS

Scopus Publications

Dataset for multi-perspective traffic video analysis
Ramon Sanchez-Iborra, Vasileios Kouvakis, Stylianos E. Trevlakis, Gonzalo Alarcon-Hellin, Theodoros Tsiftsis, Luis Bernal-Escobedo, Rodrigo Asensio-Garriga, Alexandros-Apostolos A. Boulogeorgos, Antonio Skarmeta
Scientific Data, 2026
Multi-angle video recordings are of significant interest as they provide comprehensive and synchronized data from multiple perspectives. This enables advanced analysis and modeling in environments with complex conditions due to their dynamics or the presence of obstacles, which lead to occlusions or loss of information in single-camera setups. This dataset comprises video footage of vehicular and pedestrian activity from three complementary viewpoints: A vehicle-mounted camera, a road side unit-mounted surveillance camera, and a drone-mounted camera. The dataset can be used in several domains including object, event, and activity recognition and tracking, urban analysis and planning, digital twinning, as well as semantic communication. To demonstrate its usefulness, standardized metrics are employed to provide quantitative evidence of the dataset's quality and reliability in comparison with existing datasets. The multi-modal nature of the footage paves the way for novel research in sensor fusion architectures and multi-scale modeling, critical for next-generation smart urban infrastructures.
Active RIS-Aided Full-Duplex Cell-Free Massive MIMO for Mobile Wireless Networks of Limited Capacity
Sravani Kurma, Keshav Singh, Alexandros-Apostolos A. Boulogeorgos, Theodoros A. Tsiftsis, Chih-Peng Li
IEEE Transactions on Vehicular Technology, 2026
In the era of fifth-generation (5G) mobile networks and the impending advent of sixth-generation (6G) networks, the demand for higher data rates, improved spectral efficiency, and seamless user experiences is exponentially growing. One of the promising countermeasures is the integration of active reconfigurable intelligent surfaces (RIS) with full-duplex (FD) cell-free massive multiple-input multiple-output (CFm-MIMO) systems, catering to the dynamic mobility of users and limited fronthaul resources. However, the feasibility of such system is questionable. To cover this research gap, this paper presents a comprehensive outage performance analysis of the FD CFm-MIMO system, considering the impact of the realistic parameters, such as user mobility, partial channel state information (CSI), and limited fronthaul capacity. In this direction, we provide a tight approximation for the outage probability. The findings of this research underscore the pivotal role of user mobility, CSI accuracy, configuration of active RIS, users and access point antennas, and quantization parameters on the outage performance of the active RIS-assisted FD CFm-MIMO wireless system.
Metaverse Framework for Wireless Systems Management
Ilias Chrysovergis, Alexandros-Apostolos A. Boulogeorgos, Theodoros A. Tsiftsis, Dusit Niyato
IEEE Internet of Things Magazine, 2026
Secure and Green RSMA-Assisted Heterogeneous ISAC
Xudong Li, Rugui Yao, Theodoros A. Tsiftsis, Alexandros-Apostolos A. Boulogeorgos
IEEE Transactions on Vehicular Technology, 2026
This paper investigates sensing, communication, security, and energy efficiency of the heterogeneous integrated sensing and communication networks under challenging operational conditions. We focus on scenarios in which communication performance, security, and sensing accuracy are degraded by interference, eavesdropping, and imperfect channel state information. To this end, we analyze communication and sensing signals within ISAC framework as well as the communication signals of a multicast network based on <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">rate-splitting multiple access</i> (RSMA). Then, sensing signal-to-cluster-plus-noise ratio, communication rate, security rate, and <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">security energy efficiency</i> (SEE) are evaluated. To simultaneously enhance these system performances, we propose a targeted optimization framework aimed at maximizing SEE. This framework characterizes the sensing-security trade-off by jointly optimizing the transmit <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">beamforming</i> (BF) vectors and the echo BF vector to construct green interference using the echo signal, as well as common and private streams generated by RSMA. Particularly, the joint design improves the security rate and reduces power consumption, thereby enabling a higher SEE. Given the non-convex nature of the optimization problem, we present an alternative approach that leverages Taylor series expansion, majorization-minimization, semi-definite programming, and successive convex approximation techniques. Specifically, we decompose the original non-convex and intractable optimization problem into three simplified sub-optimization problems, which are iteratively solved using an alternating optimization strategy. Simulations provide comparisons with state-of-the-art schemes, highlighting the superior efficiency, robustness, and scalability of the proposed joint multi-BF optimization scheme based on RSMA and green interference in improving system performances.
On the Joint Effect of Disorientation and Misalignment on LiDAR Systems
Alexandros-Apostolos A. Boulogeorgos, Stylianos E. Trevlakis, Theodoros A. Tsiftsis, Joonas Kokkoniemi, Markku Juntti
IEEE Wireless Communications Letters, 2026
Light detection and ranging (LiDAR) systems are a key technology for sensing in terms of ranging and velocity of a mobile target for various environments, such as terrestrial, satellite, underwater, etc. However, the turbulence-induced fading and pointing errors are inherent detrimental effects in laser communications. In this paper, we study both the disorientation and misalignment errors of LiDAR systems over Gamma-Gamma turbulence fading channels. The analysis puts emphasis on either time of flight (ToF) or frequency-modulated continuous wave (FMCW) LiDAR ranging and velocity precision and provides the theoretical frameworks for deriving the aforementioned key performance indicators. In more detail, we extract closed-form Cramér-Rao Lower Bounds (CRLBs) for ranging and velocity precision and validation via Monte Carlo simulations. As a final step, we extract the operational bounds of both ToF and FMCW LiDARs due to the joint effect of disorientation and misalignment.
Towards Joint Optimization for UAV-Integrated RIS-Assisted Fluid Antenna Systems
Ali Reda, Tamer Mekkawy, Theodoros A. Tsiftsis, Chan-Byoung Chae, Kai-Kit Wong
IEEE Transactions on Vehicular Technology, 2026
Unmanned aerial vehicles (UAVs) integrated into cellular networks face significant challenges from air-to-ground interference. To address this, we propose a downlink UAV communication system that leverages a fluid antenna system (FAS)-assisted reconfigurable intelligent surface (RIS) to enhance signal quality. By jointly optimizing the FAS port positions and RIS phase shifts, we maximize the achievable rate. The resulting non-convex optimization problem is solved using successive convex approximation (SCA) based on second-order cone programming (SOCP), which reformulates the constraints into a tractable form. Simulation results show that the proposed algorithm significantly improves both outage probability and achievable rate over conventional fixed-position antenna (FPA) schemes, with particularly large gains in large-scale RIS configurations. Moreover, the algorithm converges rapidly, making it suitable for real-time applications.
Speed-Aware Asynchronous Deep Reinforcement Learning for Joint Handover Parameter Adaptation in 5G and Beyond Networks
Chenhao Shi, Chiew Foong Kwong, Qianyu Liu, Zekai Huang, Zheng Chu, Theodoros A. Tsiftsis
IEEE Communications Letters, 2026
In response to the explosive growth of data rates and traffic in 5G and beyond, network densification has emerged as a key solution. However, this approach presents significant challenges for mobility management, including high frequency of handovers (HOs), ping-pong effects, and HO failures. To address these problems, this letter proposes the speed-aware asynchronous reinforcement learning (RL) HO algorithm to dynamically adjust two HO control parameters in Self-Organizing Networks (SON), i.e., HO Margin and Time-to-Trigger. Simulation results demonstrate that the speed-aware asynchronous RL approach achieves superior performance compared to speed-unaware one, Reference Signal Received Power (RSRP)-based and other RL-based approaches.
Backscatter-Assisted High-Speed Rail Communications in Straight Tunnel Environments: Effects of Tag Number and Phase Control
Yunping Mu, Gongpu Wang, Ruisi He, Theodoros A. Tsiftsis, Saman Atapattu, Chintha Tellambura
IEEE Wireless Communications Letters, 2026
Backscatter communication is a promising technology to enhance the signal strength received by the receiver in straight tunnel environments. The impact of the number of tags and their phase adjustment on system performance remains a challenging issue though. Therefore, in this paper, we investigate the channel gain of backscatter-assisted communication with multiple tags in straight tunnels. In particular, we derive the probabilities that the backscatter link gain is greater than the direct link under adjustable and random phase assumptions by applying the Gaussian and Gamma approximations to derive tractable expressions. The simulation results show that phase-adjustable tags significantly improve the channel gain of the backscatter links compared to the random phase case. Moreover, the number of tags has an upper threshold for an effective tag deployment pattern. These insights provide valuable guidelines for the efficient design of backscatter communication systems in tunnel environments.
SORIS: A Self-Organized Reconfigurable Intelligent Surface Architecture for Wireless Communications
Evangelos Koutsonas, Alexandros-Apostolos A. Boulogeorgos, Stylianos E. Trevlakis, George C. Alexandropoulos, Theodoros A. Tsiftsis, Rui Zhang
IEEE Transactions on Green Communications and Networking, 2026
In this paper, a new reconfigurable intelligent surface (RIS) hardware architecture, called self-organized RIS (SORIS), is proposed. The architecture incorporates a microcontroller connected to a single-antenna receiver operating at the same frequency as the RIS unit elements, operating either in transmission or reflection mode. The transmitting RIS elements enable the low latency estimation of both the incoming and outcoming channels at the micro-controller’s side. In addition, a machine learning approach for estimating the incoming and outcoming channels involving the remaining RIS elements operating in reflection mode is devised. Specifically, by appropriately selecting a small number of elements in transmission mode, and based on the channel reciprocity principle, the respective channel coefficients are first estimated, which are then fed to a low-complexity neural network that, leveraging spatial channel correlation over RIS elements, returns predictions of the channel coefficients referring to the rest of elements. In this way, the SORIS microcontroller acquires channel state information, and accordingly reconfigures the panel’s metamaterials to assist data communication between a transmitter and a receiver, without the need for separate connections with them. Moreover, the impact of channel estimation on the proposed solution, and a detailed complexity analysis for the used model, as well as a wiring density and control signaling analysis, is performed. The feasibility and efficacy of the proposed self-organized RIS design and operation are verified by Monte Carlo simulations, providing useful guidelines on the selection of the RIS elements for operating in transmission mode for initial channel estimation.
Maneuverable-Jamming-Aided Secure Communication and Sensing in A2G-ISAC Systems
Libiao Lou, Yuan Liu, Fotis Foukalas, Hongjiang Lei, Gaofeng Pan, Theodoros A. Tsiftsis, Hongwu Liu
IEEE Transactions on Vehicular Technology, 2026
In this paper, we propose a maneuverable-jamming-aided secure communication and sensing (SCS) scheme for an air-to-ground integrated sensing and communication (A2G-ISAC) system, where a dual-functional source UAV and a maneuverable jamming UAV operate collaboratively in a hybrid monostatic-bistatic radar configuration. The maneuverable jamming UAV emits artificial noise to assist the source UAV in detecting multiple ground targets while interfering with an eavesdropper. The effects of residual interference caused by imperfect successive interference cancellation on the received signal-to-interference-plus-noise ratio are considered, which degrades the system performance. To maximize the average secrecy rate (ASR) under transmit power budget, UAV maneuvering constraints, and sensing requirements, the dual-UAV trajectory and beamforming are jointly optimized. Given that secure communication and sensing fundamentally conflict in terms of resource allocation, making it difficult to achieve optimal performance for both simultaneously, we adopt a two-phase design to address this challenge. By dividing the mission into the secure communication (SC) phase and the SCS phase, the A2G-ISAC system can focus on optimizing distinct objectives separately. In the SC phase, a block coordinate descent algorithm employing the trust-region successive convex approximation and semidefinite relaxation iteratively optimizes dual-UAV trajectory and beamforming. For the SCS phase, a weighted distance minimization problem determines the suitable dual-UAV sensing positions by a greedy algorithm, followed by the joint optimization of source beamforming and jamming beamforming. Simulation results demonstrate that the proposed scheme achieves the highest ASR among benchmarks while maintaining robust sensing performance, and confirm the impact of the SIC residual interference on both secure communication and sensing.
High Efficient and Near-Optimal Binary Computation Offloading Strategy Based on Game Theory and Greedy Optimization
Lipei Liu, Rugui Yao, Xiaoya Zuo, Aris Karampelas Timotijevic, Ye Fan, Lin Yu, Theodoros A. Tsiftsis
IEEE Internet of Things Journal, 2026
RSMA-Enabled Covert Communications Against Multiple Spatially Random Wardens
Xinyue Pei, Jihao Liu, Xuewen Luo, Xingwei Wang, Yingyang Chen, Miaowen Wen, Theodoros A. Tsiftsis
IEEE Transactions on Vehicular Technology, 2026
Waveform Design for Partial-Time Superimposed ISAC Systems
Xi Nan, Rugui Yao, Ye Fan, Ruikang Zhong, Xiaoya Zuo, Theodoros A. Tsiftsis, Alexandros-Apostolos A. Boulogeorgos
IEEE Transactions on Green Communications and Networking, 2026
High-Fidelity Coherent-One-Way QKD Simulation Framework for 6G Networks: Bridging Theory and Reality
Aitor Brazaola-Vicario, Vasileios Kouvakis, Stylianos E. Trevlakis, Alejandra Ruiz, Alexandros-Apostolos A. Boulogeorgos, Theodoros A. Tsiftsis, Dusit Niyato
IEEE Transactions on Network and Service Management, 2026
Enhancing C-V2X with Blockchain and Zero-Knowledge Proofs for Improved Privacy, and Trustworthiness
Ningyuan Chen, Chiew Foong Kwong, David Chieng, Pushpendu Kar, Chenyu Yang, Qianyu Liu, Theodoros A. Tsiftsis, Yusen Chen
IEEE Transactions on Vehicular Technology, 2026
Retraction Notice: A Spatial Delay Domain-Based Prony Channel Prediction Method for Massive MIMO LEO Communications (IEEE Systems Journal (2023) 17:3 (4137–4148) DOI: 10.1109/JSYST.2022.3223145)
Zhiqiang Liu, Di Zhang, Jingjing Guo, Theodoros A. Tsiftsis, Yuwei Su, Battulga Davaasambuu, Sahil Garg, Takuro Sato
IEEE Systems Journal, 2025
Performance of Optical Wireless Communications with Spatial Diversity over Fisher-Snedecor Turbelence Channels
Wenhui Zeng, Theodoros A. Tsiftsis
8th World Conference on Computing and Communication Technologies Wccct 2025, 2025
On the Ergodic Rate of CR-Aided Multi-User Uplink RSMA and NOMA
Tianzhi He, Theodoros A. Tsiftsis
8th World Conference on Computing and Communication Technologies Wccct 2025, 2025
Performance evaluation of 5G NR NTN communication services over GovSatCom system
Vasilis Basiouris, Fotis Foukalas, Theodoros Tsiftsis
2025 IEEE Conference on Network Function Virtualization and Software Defined Networking Nfv Sdn 2025, 2025
FedSemiSelf: A Hybrid Semi-Self-Supervised Federated Learning Framework
Fotios Filippou, Fotis Foukalas, Theodoros Tsiftsis
2025 3rd International Conference on Federated Learning Technologies and Applications Flta 2025, 2025
Dual-Hop Hybrid Communication for Underwater and Terrestrial Systems: A Study on VLC and RF/FSO/THz Integration
Hanojhan Rajahrajasingh, Dushantha Nalin K. Jayakody, Theodoros A. Tsiftsis
2025 IEEE International Conference on Communications Workshops Icc Workshops 2025, 2025
Holographic RIS Empowered THz Communications With Hardware Imperfections Under Adverse Weather Conditions
Alexandros-Apostolos A. Boulogeorgos, Stylianos E. Trevlakis, Theodoros A. Tsiftsis
IEEE Transactions on Communications, 2025
Edge deep learning for low capabilities devices
Fotios Filippou, Fotis Foukalas, Theodoros Tsiftsis
Balkancom 2025 8th International Balkan Conference on Communications and Networking Empowering Connections Enabling Innovation, 2025
Dual-Channel OOK (D-COOK) Modulation for UAV-Assisted Mixed THz/VLC Systems
Hanojhan Rajahrajasingh, Dushantha Nalin K. Jayakody, P. Muthuchidambaranathan, Theodoros A. Tsiftsis
2025 IEEE International Conference on Communications Workshops Icc Workshops 2025, 2025
On the Performance Analysis of Full-Duplex Cell-Free Massive MIMO With User Mobility and Imperfect CSI
Sravani Kurma, Keshav Singh, Prabhat Kumar Sharma, Chih-Peng Li, Theodoros A. Tsiftsis
IEEE Transactions on Communications, 2025
Integrated Channel Estimation and Phase Optimization in RIS-Assisted MIMO Network: An End-to-End Deep Learning Approach
Xiaonan Mu, Haoxuan Liu, Alexandros-Apostolos. A. Boulogeorgos, Theodoros A. Tsiftsis, Wenjing Wang
IEEE International Symposium on Personal Indoor and Mobile Radio Communications PIMRC, 2025
Robust Transmission Design for RIS-Aided Full-Duplex-RSMA V2X Communications via Multi-Agent DRL
Sonia Pala, Mayur Katwe, Keshav Singh, Theodoros A. Tsiftsis, Chih-Peng Li
IEEE Transactions on Vehicular Technology, 2025
Physical-Layer Security in AmBC-NOMA Networks With Random Eavesdroppers
Xinyue Pei, Xingwei Wang, Min Huang, Yingyang Chen, Xiaofan Li, Theodoros A. Tsiftsis
IEEE Internet of Things Journal, 2025
A Digital Twin Based Reconfigurable Intelligent Surface Phase Adaptation Using Spiking Reinforcement Learning Policy Optimization
Ilias Crysovergis, Stylianos E. Trevlakis, Dimitris Kleitsas, Alexandros-Apostolos A. Boulogeorgos, Theodoros A. Tsiftsis, Dusit Niyato
2025 IEEE International Conference on Machine Learning for Communication and Networking Icmlcn 2025, 2025
Hybrid-RIS Empowered UAV-Assisted ISAC Systems: Transfer Learning-Based DRL
Prajwalita Saikia, Anand Jee, Keshav Singh, Wan-Jen Huang, Alexandros-Apostolos A. Boulogeorgos, Theodoros A. Tsiftsis
IEEE Transactions on Communications, 2025
Covert Communications in Active-IOS Aided Uplink NOMA Systems With Full-Duplex Receiver
Xueyu Kang, Nan Qi, Lu Lv, Alexandros-Apostolos A. Boulogeorgos, Theodoros A. Tsiftsis, Hongwu Liu
IEEE Transactions on Vehicular Technology, 2025
Hierarchical Blockchain Radio Access Networks: Architecture, Modelling, and Performance Assessment
Vasileios Kouvakis, Stylianos E. Trevlakis, Alexandros-Apostolos A. Boulogeorgos, Hongwu Liu, Waqas Khalid, Theodoros A. Tsiftsis, Octavia A. Dobre
IEEE Open Journal of the Communications Society, 2025
RIS-Assisted SATINs with RSMA and DRL: A Trade-Off between Spectral, Secrecy, and Energy Efficiency
Min Wu, Kefeng Guo, Xingwang Li, Zhi Lin, Liang Yang, Theodoros A. Tsiftsis, Chau Yuen
IEEE Transactions on Communications, 2025
IRS Channel Estimation in Cell-free MIMO Network: A Coalition Formation Guided Federated Learning Approach
Haoxuan Liu, Nan Qi, Xiaojie Li, Alexandros A. A. Boulogeorgos, Theodoros A. Tsiftsis, Ming Xiao, Juha Röning
IEEE Wireless Communications and Networking Conference Wcnc, 2025
On the physical layer security of visible light communications empowered by gold nanoparticles
Geonho Han, Hyuckjin Choi, Ryeong Myeong Kim, Ki Tae Nam, Junil Choi, Theodoros A. Tsiftsis
Journal of Optical Communications and Networking, 2024
Reconfigurable Intelligent Surfaces Aided Energy Efficiency Maximization in Cell-Free Networks
Kewei Wang, Nan Qi, Haoxuan Liu, Alexandros-Apostolos A. Boulogeorgos, Theodoros A. Tsiftsis, Ming Xiao, Kai-Kit Wong
IEEE Wireless Communications Letters, 2024
Next-Generation Full Duplex Networking Systems Empowered by Reconfigurable Intelligent Surfaces
Yingyang Chen, Yuncong Li, Miaowen Wen, Duoying Zhang, Bingli Jiao, Zhiguo Ding, Theodoros A. Tsiftsis, H. Vincent Poor
IEEE Transactions on Wireless Communications, 2024
Robust Transmission Design in Multiobjective RIS-Aided SWIPT IoT Communications
Vaibhav Sharma, Raviteja Allu, Sandeep Kumar Singh, Keshav Singh, Trung Q. Duong, Theodoros A. Tsiftsis
IEEE Internet of Things Journal, 2024
Active-RIS-Aided Covert Communications in NOMA Systems With Cooperative Jamming
Xueyu Kang, Hongjiang Lei, Liang Yang, Gaofeng Pan, Theodoros A. Tsiftsis, Hongwu Liu
IEEE Transactions on Vehicular Technology, 2024
Rate-Splitting Multiple Access with Finite Blocklength and High Mobility for URLLC Transmissions
Jinping Zhu, Yingyang Chen, Xinyue Pei, Tingrui Pei, Xiaofan Li, Theodoros A. Tsiftsis
IEEE Wireless Communications Letters, 2024
Network deployment with energy efficiency optimization in IRS-assisted cell-free MIMO system
Haoxuan Liu, Nan Qi, Kewei Wang, Theodoros A. Tsiftsis, Wenjing Wang, Yawen Liu
Physical Communication, 2024
Power Allocation and Performance Evaluation for NOMA-Aided Integrated Satellite-HAP-Terrestrial Networks Under Practical Limitations
Kefeng Guo, Haifeng Shuai, Kang An, Fuhui Zhou, Theodoros A. Tsiftsis, Xingwang Li, Min Wu
IEEE Internet of Things Journal, 2024
Exploiting FAS for Cooperative NOMA-based Full-duplex mmWave Networks with Imperfections
Leila Tlebaldiyeva, Sultangali Arzykulov, Theodoros A. Tsiftsis, Galymzhan Nauryzbayev
Ad Hoc Networks, 2024
Cost-Efficient Wireless Friendly Jamming and Interference Mitigation: No Pains, No Gains
Nan Qi, Zhe Su, Wen-Jing Wang, Rugui Yao, Theodoros A. Tsiftsis
IEEE Transactions on Vehicular Technology, 2024
Joint Resource Allocation and Link Adaptation for Beyond 5G Time Sensitive Communications
Christos Tsakos, Fotis Foukalas, Theodoros Tsiftsis
2024 IEEE Conference on Standards for Communications and Networking Cscn 2024, 2024
NeuroRIS: Neuromorphic-Inspired Metasurfaces
Christos G. Tsinos, Alexandros-Apostolos A. Boulogeorgos, Theodoros A. Tsiftsis
IEEE Wireless Communications Letters, 2024
Joint Radar-Communication Systems by Optimizing Radar Performance and Quality of Service for Communication Users
Christos G. Tsinos, Aakash Arora, Theodoros A. Tsiftsis
IEEE Transactions on Radar Systems, 2024
Enhanced Covertness with Relay Selection over Nakagami-m Fading Channel
Yuxin Rong, Theodoros A. Tsiftsis, Alexandros-Apostolos A. Boulogeorgos
2024 IEEE Cic International Conference on Communications in China Iccc 2024, 2024
Multi-Vehicle Collaborative Sensing in RSMA-Assisted ISAC Systems
Ling He, Yingyang Chen, Miaowen Wen, Theodoros A. Tsiftsis
2024 IEEE International Conference on Communications Workshops Icc Workshops 2024, 2024
Deep Learning Approach for GNSS Jamming Detection-Based PCA and Bayesian Optimization Feature Selection Algorithm
Ali Reda, Tamer Mekkawy, Theodoros A. Tsiftsis, Ashraf Mahran
IEEE Transactions on Aerospace and Electronic Systems, 2024
Toward Modeling and Assessing the Disorientation and Misalignment Effect in Optical Wireless Nano-Networks
Alexandros-Apostolos A. Boulogeorgos, Stylianos E. Trevlakis, Theodoros A. Tsiftsis, Angeliki Alexiou
IEEE Journal on Selected Areas in Communications, 2024
Multi-User Connectivity: Advanced User Grouping in RF/VLC Systems with SLIPT for Cooperative NOMA Networks
Priyashantha Tennakoon, Dushantha Nalin K. Jayakody, Alexandros-Apostolos A. Boulogeorgos, Theodoros A. Tsiftsis
2024 IEEE International Conference on Communications Workshops Icc Workshops 2024, 2024
Active RIS-Assisted CFm-MIMO with User Mobility and Constrained Fronthaul Capacity
Sravani Kurma, Keshav Singh, Vimal Bhatia, Chih-Peng Li, Theodoros A. Tsiftsis
IEEE International Conference on Communications, 2024
ML-Driven Resource Optimization in Active-Star-RIS-Aided THz ISAC Systems with DDA Modulation
Sravani Kurma, Keshav Singh, Shahid Mumtaz, Theodoros A. Tsiftsis, Chih-Peng Li
IEEE International Conference on Communications, 2024
Impact of Inter-Operator Interference via Reconfigurable Intelligent Surfaces
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Panagiotis A. Karkazis, Helen C. Leligou, Petar Popovski
IEEE Wireless Communications Letters, 2024
Hybrid-RIS Empowered UAV-Aided ISAC Systems
Prajwalita Saikia, Anand Jee, Keshav Singh, Theodoros A. Tsiftsis, Alexandros-Apostolos A. Boulogeorgos
IEEE Vehicular Technology Conference, 2024
Joint Trajectory and Beamforming Optimization for Federated DRL-Aided Space-Aerial-Terrestrial Relay Networks With RIS and RSMA
Kefeng Guo, Min Wu, Xingwang Li, Zhi Lin, Theodoros A. Tsiftsis
IEEE Transactions on Wireless Communications, 2024
Resource Optimization in Active-STAR-RIS-Aided THz ISAC Systems With DDA Modulation: A Machine-Learning Approach
Sravani Kurma, Keshav Singh, Shahid Mumtaz, Theodoros A. Tsiftsis, Chih-Peng Li
IEEE Transactions on Wireless Communications, 2024
Extreme Level Crossing Rate: A New Performance Indicator for URLLC Systems
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Panagiotis A. Karkazis, Helen C. Leligou, Fotis Foukalas
IEEE Transactions on Vehicular Technology, 2024
Intelligent Rate-Splitting Multiple Access-Enabled Coordinated Direct and Relay Transmission
Fengcheng Xiao, Miaowen Wen, Liang Yang, Theodoros A. Tsiftsis, Hongwu Liu
IEEE Wireless Communications Letters, 2024
URLLC-Enabled Full-Duplex Cell-Free Massive MIMO Systems With Mobility
Sravani Kurma, Keshav Singh, Prabhat Kumar Sharma, Chih-Peng Li, Theodoros A. Tsiftsis
IEEE Open Journal of the Communications Society, 2024
RIS-Aided Integrated Sensing and Communication Systems: STAR-RIS Versus Passive RIS?
Prajwalita Saikia, Anand Jee, Keshav Singh, Cunhua Pan, Wan-Jen Huang, Theodoros A. Tsiftsis
IEEE Open Journal of the Communications Society, 2024
An Innovative Architectural Blueprint Towards Sustainable 6G Systems
Stylianos E. Trevlakis, Maria Belesioti, Harilaos Koumaras, Alexandros–Apostolos A. Boulogeorgos, Ioannis Chochliouros, Theodoros A. Tsiftsis
IEEE International Workshop on Computer Aided Modeling and Design of Communication Links and Networks Camad, 2024
On Secure NOMA-Aided Semi-Grant-Free Systems
Hongjiang Lei, Fangtao Yang, Hongwu Liu, Imran Shafique Ansari, Kyeong Jin Kim, Theodoros A. Tsiftsis
IEEE Transactions on Wireless Communications, 2024
Markov Chain-Based Model of Blockchain Radio Access Networks
Vasileios Kouvakis, Stylianos E. Trevlakis, Alexandros-Apostolos A. Boulogeorgos, Hongwu Liu, Theodoros A. Tsiftsis, Octavia A. Dobre
IEEE International Workshop on Computer Aided Modeling and Design of Communication Links and Networks Camad, 2024
STAR-RIS-Aided Covert Communications in MISO-RSMA Systems
Heng Chang, Xueyu Kang, Hongjiang Lei, Theodoros A. Tsiftsis, Gaofeng Pan, Hongwu Liu
IEEE Transactions on Green Communications and Networking, 2024
When Sign Language Meets Semantic Communications
Vasileios Kouvakis, Stylianos E. Trevlakis, Alexandros-Apostolos A. Boulogeorgos, Theodoros Tsiftsis, Keshav Singh, Nan Qi
IEEE International Symposium on Personal Indoor and Mobile Radio Communications PIMRC, 2024
Will Element Grouping Enhance Covert Communication Performance in ARIS-Aided NOMA Systems?
Xueyu Kang, Feng Lu, Miaomiao Zhu, Liang Yang, Theodoros A. Tsiftsis, Hongwu Liu
International Conference on Communications in China Iccc Workshops 2024, 2024
Secrecy Performance Analysis of RSMA-Based Communications Under Partial CSIT Against Randomly Located Eavesdroppers
Xinyue Pei, Yingyang Chen, Miaowen Wen, Tingrui Pei, Xingwei Wang, Theodoros A. Tsiftsis
IEEE Transactions on Vehicular Technology, 2024
Two-Way Satellite-HAP-Terrestrial Networks with Non-Orthogonal Multiple Access
Kefeng Guo, Haifeng Shuai, Xingwang Li, Liang Yang, Theodoros A. Tsiftsis, Arumugam Nallanathan, Min Wu
IEEE Transactions on Vehicular Technology, 2024
Deep Reinforcement Learning-Based Energy Efficiency Optimization for RIS-Aided Integrated Satellite-Aerial-Terrestrial Relay Networks
Min Wu, Kefeng Guo, Xingwang Li, Zhi Lin, Yongpeng Wu, Theodoros A. Tsiftsis, Houbing Song
IEEE Transactions on Communications, 2024
Distributed Multi-UAV Trajectory Planning for Downlink Transmission: A GNN-Enhanced DRL Approach
Yifan Du, Nan Qi, Xiaojie Li, Ming Xiao, Alexandros-Apostolos A. Boulogeorgos, Theodoros A. Tsiftsis, Qihui Wu
IEEE Wireless Communications Letters, 2024
RIS-Empowered Satellite-Aerial-Terrestrial Networks With PD-NOMA
Rui Liu, Kefeng Guo, Xingwang Li, Kapal Dev, Sunder Ali Khowaja, Theodoros A. Tsiftsis, Houbing Song
IEEE Communications Surveys and Tutorials, 2024
5G-GOVSATCOM: 5G EU-GOVSATCOM Non-terrestrial Networks for Humanitarian Connectivity
Miguel Ángel Vázquez, Sergio Barrachina-Muñoz, Mauro Di Si, Fotis Foukalas, Basilio Garrido, Giovanni Giambene, Makhlouf Hadji, Hamzeh Khalili, Josep Mangues-Bafalluy, Sara Nasirian, Marina Santos, Lorenzo Santilli, Theodoros A. Tsiftsis, Marco Viali
2024 7th IEEE International Humanitarian Technologies Conference Ihtc 2024, 2024
Active RIS-Aided Covert Communications for MISO-NOMA Systems
Miaomiao Zhu, Kefeng Guo, Yinghui Ye, Liang Yang, Theodoros A. Tsiftsis, Hongwu Liu
IEEE Wireless Communications Letters, 2023
Pattern Design and Power Management for Cognitive LEO Beaming Hopping Satellite-Terrestrial Networks
Tong Li, Rugui Yao, Ye Fan, Xiaoya Zuo, N. I. Miridakis, T. A. Tsiftsis
IEEE Transactions on Cognitive Communications and Networking, 2023
A Spatial Delay Domain-Based Prony Channel Prediction Method for Massive MIMO LEO Communications
Zhiqiang Liu, Di Zhang, Jingjing Guo, Theodoros A. Tsiftsis, Yuwei Su, Battulga Davaasambuu, Sahil Garg, Takuro Sato
IEEE Systems Journal, 2023
Secrecy Outage Performance Analysis for Uplink CR-NOMA Systems With Hybrid SIC
Hongjiang Lei, Fangtao Yang, Imran Shafique Ansari, Hongwu Liu, Kyeong Jin Kim, Theodoros A. Tsiftsis
IEEE Internet of Things Journal, 2023
Covert Transmission and Secrecy Analysis of RS-RIS-NOMA-Aided 6G Wireless Communication Systems
Liang Yang, Wei Zhang, Petros S. Bithas, Hongwu Liu, Mazen O. Hasna, Theodoros A. Tsiftsis, Derrick Wing Kwan Ng
IEEE Transactions on Vehicular Technology, 2023
Green integrated cooperative spectrum sensing for cognitive satellite terrestrial networks
Rugui Yao, Yongsong Yu, Peng Wang, Ye Fan, Xudong Li, Xiaoya Zuo, Nan Qi, Nikolaos I. Miridakis, Theodoros A. Tsiftsis
Iet Communications, 2023
Joint Receive and Passive Beamforming Optimization for RIS-Assisted Uplink RSMA Systems
Qiang Sun, Hongwu Liu, Shen Yan, Theodoros A. Tsiftsis, Jinhong Yuan
IEEE Wireless Communications Letters, 2023
Intelligent reflecting surface-assisted cognitive radio-inspired rate-splitting multiple access systems
Peixu Liu, Gang Jing, Hongwu Liu, Liang Yang, Theodoros A. Tsiftsis
Digital Communications and Networks, 2023
Rate-Splitting Multiple Access Aided Mobile Edge Computing with Randomly Deployed Users
Pengxu Chen, Hongwu Liu, Yinghui Ye, Liang Yang, Kyeong Jin Kim, Theodoros A. Tsiftsis
IEEE Journal on Selected Areas in Communications, 2023
Physical-Layer Authentication for Ambient Backscatter-Aided NOMA Symbiotic Systems
Xingwang Li, Qunshu Wang, Ming Zeng, Yuanwei Liu, Shuping Dang, Theodoros A. Tsiftsis, Octavia A. Dobre
IEEE Transactions on Communications, 2023
Joint Impacts of Non-Ideal System Limitations on the Performance of NOMA-Based SatCom Networks
Haifeng Shuai, Kefeng Guo, Kang An, Yuzhen Huang, Theodoros A. Tsiftsis, Shibing Zhu
IEEE Transactions on Vehicular Technology, 2023
On the Age of Status Updates in Unreliable Multi-Source M/G/1 Queueing Systems
Muthukrishnan Senthil Kumar, Aresh Dadlani, Masoumeh Moradian, Ahmad Khonsari, Theodoros A. Tsiftsis
IEEE Communications Letters, 2023
Rate-Splitting for Intelligent Reflecting Surface-Assisted CR-NOMA Systems
Haoyu You, Zhiquan Bai, Hongwu Liu, Theodoros A. Tsiftsis, Kyung Sup Kwak
Journal of Communications and Networks, 2023
Two-Step Deep Reinforcement Q-Learning based Relay Selection in Cooperative WPCNs
Gulnur Tolebi, Theodoros A. Tsiftsis, Galymzhan Nauryzbayev
2023 International Balkan Conference on Communications and Networking Balkancom 2023, 2023
Zero Forcing Uplink Detection Through Large-Scale RIS: System Performance and Phase Shift Design
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Rugui Yao
IEEE Transactions on Communications, 2023
Symbol Level Precoding in the RF Domain for Low Hardware Complexity RIS-Assisted MU-MISO Systems
Christos G. Tsinos, Theodoros A. Tsiftsis, Robert Schober
ICASSP IEEE International Conference on Acoustics Speech and Signal Processing Proceedings, 2023
Deep Learning-based Joint Transmit and Reflective Beamforming Design for IRS-Aided MISO Multiuser Systems Under Statistical CSI
Wenwen Guan, Jiawen Tian, Theodoros A. Tsiftsis, Cunhua Pan
2023 IEEE Cic International Conference on Communications in China Iccc 2023, 2023
Full-Duplex Cooperative NOMA-based mmWave Networks with Fluid Antenna System (FAS) Receivers
Leila Tlebaldiyeva, Sultangali Arzykulov, Theodoros A. Tsiftsis, Galymzhan Nauryzbayev
2023 International Balkan Conference on Communications and Networking Balkancom 2023, 2023
RIS-Aided SWIPT Green Communications Under Imperfect CSI
Vaibhav Sharma, Raviteja Allu, Sandeep Kumar Singh, Keshav Singh, Theodoros A. Tsiftsis
Proceedings IEEE Global Communications Conference Globecom, 2023
Age of Information in Multi-Source Updating Systems: An M/G/1 Vacation Queueing Model
Muthukrishnan Senthil Kumar, Aresh Dadlani, Masoumeh Moradian, Behrouz Maham, Theodoros A. Tsiftsis
IEEE International Conference on Communications, 2023
An Efficient Learning Algorithm for Phase Shift Optimization in RIS-Aided MISO Wireless Systems
Jiawen Tian, Wenwen Guan, Xiao Li, Theodoros A. Tsiftsis, Hongwu Liu
2023 IEEE 15th International Conference on Wireless Communications and Signal Processing Wcsp 2023, 2023
Robust Design of RIS-aided Full-Duplex RSMA System for V2X communication: A DRL Approach
Sonia Pala, Mayur Katwe, Keshav Singh, Theodoros A. Tsiftsis, Chih-Peng Li
Proceedings IEEE Global Communications Conference Globecom, 2023
Outage Performance Analysis of RSMA-Aided Semi-Grant-Free Transmission Systems
Fengcheng Xiao, Xingwang Li, Liang Yang, Hongwu Liu, Theodoros A. Tsiftsis
IEEE Open Journal of the Communications Society, 2023
Uplink Cell-Free Massive MIMO URLLC Systems with User Mobility and Imperfect CSI
Sravani Kurma, Keshav Singh, Prabhat Kumar Sharma, Chih-Peng Li, Theodoros A. Tsiftsis
IEEE International Conference on Communications, 2023
Covert Beamforming Design for Active RIS-Assisted NOMA-ISAC Systems
Pengxu Chen, Fengcheng Xiao, Liang Yang, Theodoros A. Tsiftsis, Hongwu Liu
2023 IEEE Globecom Workshops GC Wkshps 2023, 2023
Detection Characteristics Error Performance analysis of High-speed Optical PPM Communication Systems with an SNSPD
Ziyuan Shi, Xiaowei Wu, Lei Yang, Yueying Zhan, Theodoros A. Tsiftsis
2023 Opto Electronics and Communications Conference Oecc 2023, 2023
RIS-Aided Integrated Sensing and Communications
Prajwalita Saikia, Anand Jee, Keshav Singh, Cunhua Pan, Theodoros A. Tsiftsis, Wan-Jen Huang
Proceedings IEEE Global Communications Conference Globecom, 2023
QR Decomposition-Based Cyclic Prefixed Single-Carrier Transmissions for Cooperative Communications: Concepts and Research Landscape
K. Kim, Hongwu Liu, Miaowen Wen, T. Tsiftsis, P. Orlik, H. V. Poor
IEEE Communications Surveys and Tutorials, 2023
Reconfigurable Intelligent Surface Aided Full Duplex Networking Systems
Yuncong Li, Yingyang Chen, Miaowen Wen, Duoying Zhang, Bingli Jiao, Zhiguo Ding, Theodoros A. Tsiftsis, H. Vincent Poor
IEEE International Conference on Communications, 2023
Backscatter Sensors Communication for 6G Low-Powered NOMA-Enabled IoT Networks Under Imperfect SIC
Manzoor Ahmed, Wali Ullah Khan, Asim Ihsan, Xingwang Li, Jianbo Li, Theodoros A. Tsiftsis
IEEE Systems Journal, 2022
Mixed THz/FSO Relaying Systems: Statistical Analysis and Performance Evaluation
Sai Li, Liang Yang, Jiayi Zhang, Petros S. Bithas, Theodoros A. Tsiftsis, Mohamed-Slim Alouini
IEEE Transactions on Wireless Communications, 2022
Rate-Splitting Multiple Access-Enabled Security Analysis in Cognitive Satellite Terrestrial Networks
Xudong Li, Ye Fan, Rugui Yao, Peng Wang, Nan Qi, Nikolaos I. Miridakis, Theodoros A. Tsiftsis
IEEE Transactions on Vehicular Technology, 2022
Joint Task Offloading and Resource Allocation for IoT Edge Computing With Sequential Task Dependency
Xuming An, Rongfei Fan, Han Hu, Ning Zhang, Saman Atapattu, Theodoros A. Tsiftsis
IEEE Internet of Things Journal, 2022
Performance and Channel Modeling Optimization for Hovering UAV-Assisted FSO Links
Wenjng Guo, Yueying Zhan, Theodoros A. Tsiftsis, Lei Yang
Journal of Lightwave Technology, 2022
Secure Spectrum-Energy Efficiency Tradeoff Based on Stackelberg Game in a Two-Way Relay Cognitive Satellite Terrestrial Network
Xudong Li, Rugui Yao, Ye Fan, Peng Wang, Nan Qi, Nikolaos I. Miridakis, Theodoros A. Tsiftsis
IEEE Wireless Communications Letters, 2022
New Antenna Selection Schemes for Full-Duplex Cooperative MIMO-NOMA Systems
Zahra Mobini, Mohammadali Mohammadi, Theodoros A. Tsiftsis, Zhiguo Ding, Chintha Tellambura
IEEE Transactions on Communications, 2022
Outage Performance of Cross-Packet HARQ
Jiahui Feng, Zheng Shi, Guanghua Yang, Nikolaos I. Miridakis, Shaodan Ma, Theodoros A. Tsiftsis
IEEE Wireless Communications Letters, 2022
A New Rate Splitting Strategy for Uplink CR-NOMA Systems
Hongwu Liu, Zhiquan Bai, Hongjiang Lei, Gaofeng Pan, K. Kim, T. Tsiftsis
IEEE Transactions on Vehicular Technology, 2022
Extreme Age of Information for Wireless-Powered Communication Systems
Nikolaos I. Miridakis, Zheng Shi, Theodoros A. Tsiftsis, Guanghua Yang
IEEE Wireless Communications Letters, 2022
On Secure NOMA-Based Terrestrial and Aerial IoT Systems
Hongjiang Lei, Chen Zhu, Ki-Hong Park, Weijia Lei, Imran Shafique Ansari, Theodoros A. Tsiftsis
IEEE Internet of Things Journal, 2022
Codebook Training for Trellis-Based Hierarchical Grassmannian Classification
Stefan Schwarz, Theodoros Tsiftsis
IEEE Wireless Communications Letters, 2022
Non-Linear Age of Information: An Energy Efficient Receiver-Centric Approach
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Guanghua Yang
IEEE Wireless Communications Letters, 2022
Metasurface-Coated Devices: A New Paradigm for Energy-Efficient and Secure 6G Communications
Theodoros Tsiftsis, Constantinos Valagiannopoulos, Hongwu Liu, Alexandros-Apostolos A. Boulogeorgos, Nikolaos I. Miridakis
IEEE Vehicular Technology Magazine, 2022
Multi-Metric Waveform Optimization for Multiple-Input Single-Output Joint Communication and Radar Sensing
Zhitong Ni, J. Andrew Zhang, Kai Yang, Xiaojing Huang, Theodoros A. Tsiftsis
IEEE Transactions on Communications, 2022
On the Performance of Dual RIS-assisted V2I Communication under Nakagami-m Fading
Mohd Hamza Naim Shaikh, Khaled Rabie, Xingwang Li, Theodoros Tsiftsis, Galymzhan Nauryzbayev
IEEE Vehicular Technology Conference, 2022
Semi-Blind Multiuser Detection under the Presence of Reconfigurable Intelligent Surfaces
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Guanghua Yang, Panagiotis A. Karkazis, Helen C. Leligou
IEEE Wireless Communications Letters, 2022
Outage Analysis and Realization Challenges of RIS-enabled Underlay CR Networks over Nakagami-m Fading
Madi Makin, Kassen Dautov, Mohammad S. Hashmi, Theodoros A. Tsiftsis, Galymzhan Nauryzbayev
International Conference on ICT Convergence, 2022
Enhancing QoS Through Fluid Antenna Systems over Correlated Nakagami-m Fading Channels
Leila Tlebaldiyeva, Galymzhan Nauryzbayev, Sultangali Arzykulov, Ahmed Eltawil, Theodoros Tsiftsis
IEEE Wireless Communications and Networking Conference Wcnc, 2022
Rate Splitting Multiple Access Aided Mobile Edge Computing in Cognitive Radio Networks
Hongwu Liu, Yinghui Ye, Zhiquan Bai, Kyeong Jin Kim, Theodoros A. Tsiftsis
2022 IEEE International Conference on Communications Workshops Icc Workshops 2022, 2022
Energy-Efficient UAV-Relaying 5G/6G Spectrum Sharing Networks: Interference Coordination with Power Management and Trajectory Design
Wei Wang, Nan Qi, Luliang Jia, Chunguo Li, Theodoros A. Tsiftsis, Mei Wang
IEEE Open Journal of the Communications Society, 2022
Unity makes strength: Coalition Formation-based Group-buying for Timely UAV Data Collection
Nan Qi, Yeting Huang, Wen Sun, Shi Jin, Theodoros A. Tsiftsis, Qihui Wu, Xiang Su
Proceedings IEEE Global Communications Conference Globecom, 2022
Guest Editorial Advanced Signal Processing for Local and Private 5G Networks
Kyeong Jin Kim, Octavia A.t Dobre, David Lopez-Perez, H. Vincent Poor, Petar Popovski, Theodoros A. Tsiftsis, Miaowen Wen
IEEE Journal on Selected Topics in Signal Processing, 2022
Private 5G Networks: Concepts, Architectures, and Research Landscape
Miaowen Wen, Qiang Li, Kyeong Jim Kim, David Lopez-Perez, Octavia Dobre, H. Vincent Poor, Petar Popovski, Theodoros Tsiftsis
IEEE Journal on Selected Topics in Signal Processing, 2022
Cognitive d2d finite blocklength transmissions with the presence of time-selective interference
Prabhat Kumar Sharma, Prasanna Raut, Theodoros A. Tsiftsis, Paritosh Peshwe
IEEE Transactions on Vehicular Technology, 2021
Joint Spectrum and Energy Optimization of NOMA-Enabled Small-Cell Networks with QoS Guarantee
Wali Ullah Khan, Furqan Jameel, Xingwang Li, Muhammad Bilal, Theodoros A. Tsiftsis
IEEE Transactions on Vehicular Technology, 2021
Secrecy Analysis of SSK Modulation: Adaptive Antenna Mapping and Performance Results
Ugrasen Singh, Manav R. Bhatnagar, Theodoros A. Tsiftsis
IEEE Transactions on Wireless Communications, 2021
Cooperative SM-Based NOMA Scheme with SWIPT
Qintuya Si, Minglu Jin, Theodoros A. Tsiftsis, Nan Zhao, Xianbin Wang
IEEE Transactions on Vehicular Technology, 2021
Coverage Analysis of CR-based Satellite-Terrestrial NOMA Networks with Practical System Impairments
Yerassyl Akhmetkaziyev, Galymzhan Nauryzbayev, Sultangali Arzykulov, Ahmed M. Eltawil, Theodoros A. Tsiftsis
IEEE International Conference on Communications, 2021
Energy-efficient full-duplex UAV relaying networks: Trajectory design for channel-model-free scenarios
Nan Qi, Wei Wang, Diliao Ye, Mei Wang, Theodoros A. Tsiftsis, Rugui Yao
ETRI Journal, 2021
On the Secrecy Performance of NOMA-Based Integrated Satellite Multiple-Terrestrial Relay Networks with Hardware Impairments
Kefeng Guo, Kang An, Feng Zhou, Theodoros A. Tsiftsis, Gan Zheng, Symeon Chatzinotas
IEEE Transactions on Vehicular Technology, 2021
Moment-Based Spectrum Sensing under Generalized Noise Channels
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Guanghua Yang
IEEE Communications Letters, 2021
An Overview of Enabling Federated Learning over Wireless Networks
Fotis Foukalas, Athanasios Tziouvaras, Theodoros A. Tsiftsis
2021 IEEE International Mediterranean Conference on Communications and Networking Meditcom 2021, 2021
A Learning-Based Spectrum Access Stackelberg Game: Friendly Jammer-Assisted Communication Confrontation
Nan Qi, Wei Wang, Ming Xiao, Luliang Jia, Shi Jin, Qiuming Zhu, Theodoros A. Tsiftsis
IEEE Transactions on Vehicular Technology, 2021
Generalized Energy Detection under Generalized Noise Channels
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Guanghua Yang
IEEE Wireless Communications Letters, 2020
Feature-oriented channel estimation in reconfigurable intelligent surface-assisted wireless communication systems
Junliang Lin, Gongpu Wang, Rongfei Fan, Yulong Zou, Theodoros A. Tsiftsis, Chintha Tellambura
Iet Communications, 2020
Feedback-Based SSK Modulation: Constellation Design and Performance Results
Ugrasen Singh, Manav R. Bhatnagar, Theodoros A. Tsiftsis
IEEE Transactions on Communications, 2020
Signal Detection in Uplink Time-Varying OFDM Systems Using RNN with Bidirectional LSTM
Shengyao Wang, Rugui Yao, Theodoros A. Tsiftsis, Nikolaos I. Miridakis, Nan Qi
IEEE Wireless Communications Letters, 2020
Air-to-Air Communications beyond 5G: A Novel 3D CoMP Transmission Scheme
Yan Li, Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Guanghua Yang, Minghua Xia
IEEE Transactions on Wireless Communications, 2020
Indoor Mixed Dual-Hop VLC/RF Systems through Reconfigurable Intelligent Surfaces
Liang Yang, Xiaoqin Yan, Daniel Benevides da Costa, Theodoros A. Tsiftsis, Hong-Chuan Yang, Mohamed-Slim Alouini
IEEE Wireless Communications Letters, 2020
Energy-efficient Two-Way Full-duplex UAV Relaying Networks with Imperfect Channel State Information*
Nan Qi, Mei Wang, Wei Wang, Wen-Jing Wang, Theodoros A. Tsiftsis, Rugui Yao, Guanghua Yang
IEEE Vehicular Technology Conference, 2020
User Pair-Relay Matching in a Multiple User Pair and Multiple Untrusted Relay Network*
Rugui Yao, Doudou Song, Lukun Yao, Theodoros A. Tsiftsis, Nikolaos I. Miridakis, Nan Qi, Xiaoya Zuo, Danian Lou
12th International Conference on Wireless Communications and Signal Processing Wcsp 2020, 2020
Reconfigurable Intelligent Surface Assisted Two-Way Communications: Performance Analysis and Optimization
Saman Atapattu, Rongfei Fan, Prathapasinghe Dharmawansa, Gongpu Wang, Jamie Evans, Theodoros A. Tsiftsis
IEEE Transactions on Communications, 2020
Secrecy Performance Analysis of RIS-Aided Wireless Communication Systems
Liang Yang, Jinxia Yang, Wenwu Xie, Mazen O. Hasna, Theodoros Tsiftsis, Marco Di Renzo
IEEE Transactions on Vehicular Technology, 2020
UAV-Aided Multi-Way NOMA Networks with Residual Hardware Impairments
Xingwang Li, Qunshu Wang, Yuanwei Liu, Theodoros A. Tsiftsis, Zhiguo Ding, Arumugam Nallanathan
IEEE Wireless Communications Letters, 2020
Power-Time Splitting-Based Non-Linear Energy Harvesting in FD Short-Packet Communications
Prasanna Raut, Prabhat Kumar Sharma, Theodoros A. Tsiftsis, Yulong Zou
IEEE Transactions on Vehicular Technology, 2020
Traffic-Aware Two-Stage Queueing Communication Networks: Queue Analysis and Energy Saving
Nan Qi, Nikolaos I. Miridakis, Ming Xiao, Theodoros A. Tsiftsis, Rugui Yao, Shi Jin
IEEE Transactions on Communications, 2020
Hardware-Limited Cooperative SWIPT-enabled NOMA Networks
Orken Omarov, Sultangali Arzykulov, Galymzhan Nauryzbayev, Theodoros A. Tsiftsis
2020 12th International Symposium on Communication Systems Networks and Digital Signal Processing Csndsp 2020, 2020
Rate Splitting for Uplink NOMA with Enhanced Fairness and Outage Performance
Hongwu Liu, Theodoros A. Tsiftsis, Kyeong Jin Kim, Kyung Sup Kwak, H. Vincent Poor
IEEE Transactions on Wireless Communications, 2020
Performance Analysis of Large Intelligent Surface Aided Backscatter Communication Systems
Wenjing Zhao, Gongpu Wang, Saman Atapattu, Theodoros A. Tsiftsis, Xiaoli Ma
IEEE Wireless Communications Letters, 2020
Is backscatter link stronger than direct link in reconfigurable intelligent surface-assisted system?
Wenjing Zhao, Gongpu Wang, Saman Atapattu, Theodoros A. Tsiftsis, Chintha Tellambura
IEEE Communications Letters, 2020
Improving Caching Efficiency in Content-Aware C-RAN-Based Cooperative Beamforming: A Joint Design Approach
Ming-Min Zhao, Yunlong Cai, Min-Jian Zhao, Benoit Champagne, Theodoros A. Tsiftsis
IEEE Transactions on Wireless Communications, 2020
Energy Efficient Beamforming Schemes for Satellite-Aerial-Terrestrial Networks
Qingquan Huang, Min Lin, Jun-Bo Wang, Theodoros A. Tsiftsis, Jiangzhou Wang
IEEE Transactions on Communications, 2020
Capacity Analysis of Device-to-Device mmWave Networks under Transceiver Distortion Noise and Imperfect CSI
Leila Tlebaldiyeva, Behrouz Maham, Theodoros A. Tsiftsis
IEEE Transactions on Vehicular Technology, 2020
Physical Layer Security for Multiuser Satellite Communication Systems with Threshold-Based Scheduling Scheme
Kefeng Guo, Kang An, Bangning Zhang, Yuzhen Huang, Xiaogang Tang, Gan Zheng, Theodoros A. Tsiftsis
IEEE Transactions on Vehicular Technology, 2020
Multi-RAT Aggregation Through Spectrum Reallocation for Future Wireless Networks
Apostolos Galanopoulos, Fotis Foukalas, Theodoros A. Tsiftsis
Wireless Personal Communications, 2020
Zero-Forcing-Based Downlink Virtual MIMO-NOMA Communications in IoT Networks
Zheng Shi, Hong Wang, Yaru Fu, Guanghua Yang, Shaodan Ma, Fen Hou, Theodoros A. Tsiftsis
IEEE Internet of Things Journal, 2020
Underlay Spectrum Sharing for NOMA Relaying Networks: Outage Analysis
S. Arzykulov, G. Nauryzbayev, T. A. Tsiftsis, B. Maham, M. S. Hashmi, K. M. Rabie
2020 International Conference on Computing Networking and Communications Icnc 2020, 2020
Energy Efficient Full-Duplex UAV Relaying Networks under Load-Carry-and-Delivery Scheme
Nan Qi, Mei Wang, Wen-Jing Wang, Theodoros A. Tsiftsis, Rugui Yao, Guanghua Yang
IEEE Access, 2020
A Spectrum Efficient Constellation to Simultaneously Transmit Information and Synchronization Sequence
Rugui Yao, Yuan Zhang, Qihong Wu, Theodoros A. Tsiftsis, Nan Qi, Xiaoya Zuo, Shuxia Guo
IEEE Access, 2020
Wireless Powered Cognitive Cooperative Networks: Outage Performance
Sultangali Arzykulov, Galymzhan Nauryzbayev, Behrouz Maham, Theodoros A. Tsiftsis, Khaled M. Rabie
2019 13th International Conference on Signal Processing and Communication Systems Icspcs 2019 Proceedings, 2019
Deep Neural Network Assisted Approach for Antenna Selection in Untrusted Relay Networks
Rugui Yao, Yuxin Zhang, Shengyao Wang, Nan Qi, Nikolaos I. Miridakis, Theodoros A. Tsiftsis
IEEE Wireless Communications Letters, 2019
Metasurface-enabled interference mitigation in visible light communication architectures
Constantinos Valagiannopoulos, Theodoros A Tsiftsis, Vassilios Kovanis
Journal of Optics United Kingdom, 2019
Dual-Polarized Spatial Media-Based Modulation
Xuan Chen, Miaowen Wen, Qiang Li, Yik-Chung Wu, Theodoros A. Tsiftsis
IEEE Journal on Selected Topics in Signal Processing, 2019
Novel Data Pre-Distorter for APSK Signals in Solid-State Power Amplifiers
Maria Jesus Canavate Sanchez, Andrea Segneri, Savvas A. Kosmopoulos, Qiuming Zhu, Theodoros A. Tsiftsis, Apostolos Georgiadis, George Goussetis
IEEE Transactions on Circuits and Systems I Regular Papers, 2019
Device-to-Device mmWave Communication in the Presence of Interference and Hardware Distortion Noises
Leila Tlebaldiyeva, Behrouz Maham, Theodoros A. Tsiftsis
IEEE Communications Letters, 2019
Performance Analysis of Underlay Cognitive Radio Nonorthogonal Multiple Access Networks
Sultangali Arzykulov, Galymzhan Nauryzbayev, Theodoros A. Tsiftsis, Behrouz Maham
IEEE Transactions on Vehicular Technology, 2019
Guest Editorial Spatial Modulation in Emerging Wireless Systems
Kyeong Jin Kim, Miaowen Wen, Marco Di Renzo, Theodoros A. Tsiftsis, Kwang-Cheng Chen, Naofal Al-Dhahir
IEEE Journal on Selected Areas in Communications, 2019
Effective Capacity for Renewal Service Processes with Applications to HARQ Systems
Zheng Shi, Theodoros A. Tsiftsis, Weiqiang Tan, Guanghua Yang, Shaodan Ma, Mohamed-Slim Alouini
IEEE Transactions on Communications, 2019
Joint Power and Bandwidth Allocation for Energy-Efficient Heterogeneous Cellular Networks
Yuhan Jiang, Yulong Zou, Haiyan Guo, Theodoros A. Tsiftsis, Manav R. Bhatnagar, Rodrigo C. de Lamare, Yu-Dong Yao
IEEE Transactions on Communications, 2019
A Survey on Spatial Modulation in Emerging Wireless Systems: Research Progresses and Applications
Miaowen Wen, Beixiong Zheng, Kyeong Jin Kim, Marco Di Renzo, Theodoros A. Tsiftsis, Kwang-Cheng Chen, Naofal Al-Dhahir
IEEE Journal on Selected Areas in Communications, 2019
Green CR-NOMA: A new interweave energy harvesting transmission scheme for secondary access
N. I. Miridakis, S. Arzykulov, T. A. Tsiftsis, G. Yang, G. Nauryzbayev
Proceedings of the International Symposium on Wireless Communication Systems, 2019
Effective capacity analysis for VR-HARQ systems
Zheng Shi, Theodoros Tsiftsis, Weiqiang Tan, Guanghua Yang, Shaodan Ma, Mohamed-Slim Alouini
2019 IEEE Cic International Conference on Communications in China Iccc 2019, 2019
Secure Beamforming for Cooperative Wireless-Powered Networks with Partial CSI
Haiyan Guo, Zhen Yang, Yulong Zou, Theodoros Tsiftsis, Manav R. Bhatangar, Rodrigo C. De Lamare
IEEE Internet of Things Journal, 2019
Zero forcing detection for short packet transmission under channel estimation errors
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Hui-Ming Wang
IEEE Transactions on Vehicular Technology, 2019
Secure Users Oriented Downlink MISO NOMA
Hui-Ming Wang, Xu Zhang, Qian Yang, Theodoros A. Tsiftsis
IEEE Journal on Selected Topics in Signal Processing, 2019
Secrecy Performance of Hybrid Satellite-Terrestrial Relay Systems with Hardware Impairments
Hang Wu, Yulong Zou, Jia Zhu, Xiaochan Xue, Theodoros Tsiftsis
IEEE International Conference on Communications, 2019
Rate splitting for asynchronous uplink NOMA systems with cyclic prefixed single carrier
Hongwu Liu, Theodoros A. Tsiftsis, Kyeong Jin Kim, Kyung Sup Kwak, H. Vincent Poor
2019 IEEE International Conference on Communications Workshops Icc Workshops 2019 Proceedings, 2019
Machine Learning-Based Antenna Selection in Untrusted Relay Networks
Rugui Yao, Yuxin Zhang, Nan Qi, Theodoros A. Tsiftsis, Yinsheng Liu
2019 2nd International Conference on Artificial Intelligence and Big Data Icaibd 2019, 2019
Outage Analysis of Distributed CDD Systems with Mixture Interference
Kyeong Jin Kim, Hongwu Liu, Marco Di Renzo, Theodoros A. Tsiftsis, Philip V. Orlik, H. Vincent Poor
IEEE International Conference on Communications, 2019
On the Fundamental Queue Analysis for Relay-assisted Two-stage Communication Networks
Nan Qi, Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Rugui Yao
2019 IEEE Wireless Communications and Networking Conference Workshop Wcncw 2019, 2019
Distributed cyclic delay diversity systems with spatially distributed interferers
Kyeong Jin Kim, Marco Di Renzo, Hongwu Liu, Theodoros A. Tsiftsis, Philip V. Orlik, H. Vincent Poor
IEEE Transactions on Wireless Communications, 2019
Wireless security employing opportunistic relays and an adaptive encoder under outdated CSI and dual-correlated nakagami-m Fading
Khoa N. Le, Theodoros A. Tsiftsis
IEEE Transactions on Communications, 2019
Multihop DF relaying in NB-PLC system over Rayleigh fading and Bernoulli-Laplacian noise
Neelima Agrawal, Prabhat Kumar Sharma, Theodoros A. Tsiftsis
IEEE Systems Journal, 2019
Resource allocation in spectrum-sharing cognitive heterogeneous networks
Haijun Zhang, Theodoros A. Tsiftsis, Julian Cheng, Victor C. M. Leung
Handbook of Cognitive Radio, 2019
On the Performance of LMS Communication with Hardware Impairments and Interference
Kefeng Guo, Min Lin, Bangning Zhang, Wei-Ping Zhu, Jun-Bo Wang, Theodoros A. Tsiftsis
IEEE Transactions on Communications, 2019
Spectrum Sensing using Improved Energy Detector under Transceiver Hardware Impairments
Leila Tlebaldiyeva, Theodoros A. Tsiftsis, Behrouz Maham
2018 IEEE International Symposium on Dynamic Spectrum Access Networks Dyspan 2018, 2019
Performance Analysis of Improved Energy Detector With Hardware Impairments for Accurate Spectrum Sensing
Leila Tlebaldiyeva, Theodoros A. Tsiftsis, Behrouz Maham
IEEE Access, 2019
Broadcast cognitive radio with dirty paper coding over Nakagami-m fading channel
A. BASGUMUS, M. NAMDAR, T. TSIFTSIS
Advances in Electrical and Computer Engineering, 2019
Leveraging on the Impact of Imperfect Channel Estimation for MIMO Relaying Systems
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Guanghua Yang
IEEE Access, 2019
Outage Performance of Cooperative Underlay CR-NOMA With Imperfect CSI
Sultangali Arzykulov, Theodoros A. Tsiftsis, Galymzhan Nauryzbayev, Mohamed Abdallah
IEEE Communications Letters, 2019
Coverage probability analysis by fractional frequency reuse scheme
Joydev Ghosh, Dushanta Nalin K. Jayakody, Marwa Qaraqe, Theodoros A. Tsiftsis
Lecture Notes in Electrical Engineering, 2019
Message-Passing Receiver Design for Joint Channel Estimation and Data Decoding in Uplink Grant-Free SCMA Systems
Fan Wei, Wen Chen, Yongpeng Wu, Jun Ma, Theodoros A. Tsiftsis
IEEE Transactions on Wireless Communications, 2019
OFDM Signal Recovery in Deep Faded Erasure Channel
Alireza Rahmati, Kaamran Raahemifar, Theodoros A. Tsiftsis, Alagan Anpalagan, Paeiz Azmi
IEEE Access, 2019
Energy efficient two-tier network-coded relaying systems considering processing energy costs
Nan Qi, Ming Xiao, Theodoros A. Tsiftsis, Rugui Yao, Shahid Mumtaz
IEEE Transactions on Vehicular Technology, 2019
Impact of Hardware Impairments on Outage Performance of Hybrid Satellite-Terrestrial Relay Systems
Hang Wu, Yulong Zou, Weifeng Cao, Zhong Chen, Theodoros A. Tsiftsis, Manav R. Bhatnagar, Rodrigo C. De Lamare
IEEE Access, 2019
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
IEEE Transactions on Green Communications and Networking, 2018
Outage Performance of Underlay CR-NOMA Networks
Sultangali Arzykulov, Galymzhan Nauryzbayev, Theodoros A. Tsiftsis, Mohamed Abdallah
2018 10th International Conference on Wireless Communications and Signal Processing Wcsp 2018, 2018
Base station cooperation in millimeter wave cellular networks: Performance enhancement of cell-edge users
Hui-Ming Wang, Ke-Wen Huang, Theodoros A. Tsiftsis
IEEE Transactions on Communications, 2018
Bit-interleaved coded SCMA with iterative multiuser detection: Multidimensional constellations design
Jinchen Bao, Zheng Ma, Ming Xiao, Theodoros A. Tsiftsis, Zhongliang Zhu
IEEE Transactions on Communications, 2018
Outage and BER performances of indoor relay-assisted hybrid RF/VLC systems
Mustafa Namdar, Arif Basgumus, Theodoros Tsiftsis, Ahmet Altuncu
Iet Communications, 2018
Capacity and outage probability analysis of asymmetric dual-hop RF-FSO communication systems
Vineeth Palliyembil, Jagadeesh Vellakudiyan, Palanivel Muthuchidamdaranathan, Theodoros A. Tsiftsis
Iet Communications, 2018
Joint Beamforming Alignment with Suboptimal Power Allocation for a Two-Way Untrusted Relay Network
Tamer Mekkawy, Rugui Yao, Theodoros A. Tsiftsis, Fei Xu, Yanan Lu
IEEE Transactions on Information Forensics and Security, 2018
Underlay Cognitive Radio with Imperfect Transceiver Electronics under Nakagami-m Fading
Leila Tlebaldiyeva, Theodoros Tsiftsis
Proceedings of the 2nd International Conference on Computing and Network Communications Coconet 2018, 2018
Energy Efficient Power Allocation for Carrier Aggregation in Heterogeneous Networks: Partial Feedback and Circuit Power Consumption
Fotis Foukalas, Theodoros A. Tsiftsis
IEEE Transactions on Green Communications and Networking, 2018
On the Performance of Wireless Powered Cognitive Relay Network with Interference Alignment
Sultangali Arzykulov, Galymzhan Nauryzbayev, Theodoros A. Tsiftsis, Mohamed Abdallah
IEEE Transactions on Communications, 2018
Outage probability of non-orthogonal multiple access with partial relay selection over Nakagami-m fading channels
Rinat Yakupov, Theodoros A. Tsiftsis
Physical Communication, 2018
All cognitive MIMO: New multiuser detection approach with different priorities
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Dimitrios D. Vergados, Angelos Michalas
IEEE Transactions on Wireless Communications, 2018
On the Distribution of the Received Signal Power in Mobile Networks: A Moment-Based Approach
Jesus Lopez-Fernandez, Eduardo Martos-Naya, F. Javier Lopez-Martinez, Theodoros Tsiftsis
IEEE Transactions on Vehicular Technology, 2018
Cooperative Secure Transmission by Exploiting Social Ties in Random Networks
Hui-Ming Wang, Yiming Xu, Ke-Wen Huang, Zhu Han, Theodoros A. Tsiftsis
IEEE Transactions on Communications, 2018
Energy efficient transmission in underlay massive MIMO systems with probabilistic guarantees
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, George C. Alexandropoulos
2018 IEEE International Conference on Communications Workshops Icc Workshops 2018 Proceedings, 2018
Performance of cooperative underlay CR-NOMA networks over nakagami-m Channels
Galymzhan Nauryzbayev, Sultangali Arzykulov, Theodoros A. Tsiftsis, Mohamed Abdallah
2018 IEEE International Conference on Communications Workshops Icc Workshops 2018 Proceedings, 2018
A new two-stage multiuser MIMO detection approach with different priorities
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Dimitrios D. Vergados, Angelos Michalas
2018 IEEE International Conference on Communications Workshops Icc Workshops 2018 Proceedings, 2018
Resource allocation for energy-efficient NOMA network based on super-modular game
Ruisong Wang, Gongliang Liu, Haijun Zhang, Wenjing Kang, Theodoros Tsiftsis, Victor C. M. Leung
2018 IEEE International Conference on Communications Workshops Icc Workshops 2018 Proceedings, 2018
Device-to-device communications underlying UAV-Supported social networking
Zhen Xue, Jinlong Wang, Guoru Ding, Qihui Wu, Yun Lin, Theodoros A. Tsiftsis
IEEE Access, 2018
Super-Modular Game-Based User Scheduling and Power Allocation for Energy-Efficient NOMA Network
Gongliang Liu, Ruisong Wang, Haijun Zhang, Wenjing Kang, Theodoros A. Tsiftsis, Victor C. M. Leung
IEEE Transactions on Wireless Communications, 2018
Optimal Power Allocation and Active Interference Mitigation for Spatial Multiplexed MIMO Cognitive Systems
Nikolaos I. Miridakis, Minghua Xia, Theodoros A. Tsiftsis
IEEE Transactions on Vehicular Technology, 2018
Multiple Antennas Secure Transmission under Pilot Spoofing and Jamming Attack
Hui-Ming Wang, Ke-Wen Huang, Theodoros A. Tsiftsis
IEEE Journal on Selected Areas in Communications, 2018
Secrecy Rate-Optimum Energy Splitting for an Untrusted and Energy Harvesting Relay Network
Rugui Yao, Yanan Lu, Theodoros A. Tsiftsis, Nan Qi, Tamer Mekkawy, Fei Xu
IEEE Access, 2018
Zero-Forcing Successive Decoding Under Nakagami-m Fading Channels
Nikolaos I. Miridakis, Theodoros A. Tsiftsis
Wireless Personal Communications, 2018
Resource Allocation for Energy Harvesting-Powered D2D Communication Underlaying UAV-Assisted Networks
Haichao Wang, Jinlong Wang, Guoru Ding, Le Wang, Theodoros A. Tsiftsis, Prabhat Kumar Sharma
IEEE Transactions on Green Communications and Networking, 2018
An Improved Energy Detector for Mobile Cognitive Users over Generalized Fading Channels
Lokesh Gahane, Prabhat Kumar Sharma, Neeraj Varshney, Theodoros A. Tsiftsis, Preetam Kumar
IEEE Transactions on Communications, 2018
A New Interweave Cognitive Radio Scheme for Out-Band Energy Harvesting Systems
Nikolaos I. Miridakis, Theodoros A. Tsiftsis
IEEE Access, 2018
Outage Performance of Underlay CR-NOMA Networks with Detect-and-Forward Relaying
Sultangali Arzykulov, Theodoros A. Tsiftsis, Galymzhan Nauryzbayev, Mohamed Abdallah, Guanghua Yang
Proceedings IEEE Global Communications Conference Globecom, 2018
Coordinated Uplink Transmission for Cooperative NOMA Systems
Hongwu Liu, Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Kyeong Jin Kim, Kyung Sup Kwak
Proceedings IEEE Global Communications Conference Globecom, 2018
An Amateur Drone Surveillance System Based on the Cognitive Internet of Things
Guoru Ding, Qihui Wu, Linyuan Zhang, Yun Lin, Theodoros A. Tsiftsis, Yu-Dong Yao
IEEE Communications Magazine, 2018
Secrecy Performance of Finite-Sized Cooperative Full-Duplex Relay Systems with Unreliable Backhauls
Hongwu Liu, Kyeong Jin Kim, Theodoros A. Tsiftsis, Kyung Sup Kwak, H. Vincent Poor
IEEE Transactions on Signal Processing, 2017
Superposition Modulation-Based Cooperation for Oversampled OFDM Signals
Alireza Rahmati, Kaamran Raahemifar, Alagan Anpalagan, Theodoros A. Tsiftsis, Paeiz Azmi, Nikolaos I. Miridakis
IEEE Transactions on Communications, 2017
Low Complexity Resource Allocation for Massive Carrier Aggregation
Stelios Stefanatos, Fotis Foukalas, Theodoros A. Tsiftsis
IEEE Transactions on Vehicular Technology, 2017
A Comprehensive Framework for Spectrum Sensing in Non-Linear and Generalized Fading Conditions
Paschalis C. Sofotasios, Alireza Bagheri, Theodoros A. Tsiftsis, Steven Freear, Ali Shahzadi, Mikko Valkama
IEEE Transactions on Vehicular Technology, 2017
Efficient Coded Cooperative Networks with Energy Harvesting and Transferring
Nan Qi, Ming Xiao, Theodoros A. Tsiftsis, Lin Zhang, Mikael Skoglund, Huisheng Zhang
IEEE Transactions on Wireless Communications, 2017
Resource Allocation for Licensed/Unlicensed Carrier Aggregation MIMO Systems
Christos G. Tsinos, Fotis Foukalas, Theodoros A. Tsiftsis
IEEE Transactions on Communications, 2017
Robust Online Spectrum Prediction with Incomplete and Corrupted Historical Observations
Guoru Ding, Fan Wu, Qihui Wu, Shaojie Tang, Fei Song, Athanasios V. Vasilakos, Theodoros A. Tsiftsis
IEEE Transactions on Vehicular Technology, 2017
On the investigation of energy saving aspects of commercial lifts
Ν. Papanikolaou, M. Loupis, Ν. Spiropoulos, Ε. Mitronikas, Ε. Τatakis, C. Christodoulou, V. Zarikas, T. Τsiftsis
Energy Efficiency, 2017
Optimal transmit power and active interference mitigation of underlay MIMO cognitive systems
Nikolaos I. Miridakis, Minghua Xia, Theodoros A. Tsiftsis
IEEE International Conference on Communications, 2017
Performance analysis of uplink sparse code multiple access with iterative multiuser receiver
Jinchen Bao, Zheng Ma, Ming Xiao, Theodoros A. Tsiftsis, Zhongliang Zhu
IEEE International Conference on Communications, 2017
Resource allocation for energy harvesting-powered D2D communications underlaying cellular networks
Haichao Wang, Guoru Ding, Jinlong Wang, Le Wang, Theodoros A. Tsiftsis, Prabhat K. Sharma
IEEE International Conference on Communications, 2017
Efficient network-coded relaying systems with energy harvesting and transferring
Nan Qi, Ming Xiao, Theodoros A. Tsiftsis, Lin Zhang, Mikael Skoglund, Huisheng Zhang
IEEE International Conference on Communications, 2017
Broadcast underlay cognitive radio with dirty paper coding over fading channels
2017 10th International Conference on Electrical and Electronics Engineering Eleco 2017, 2017
Error performance of wireless powered cognitive relay networks with interference alignment
Sultangali Arzykulov, Galymzhan Nauryzbayev, Theodoros A. Tsiftsis, Mohamed Abdallah
IEEE International Symposium on Personal Indoor and Mobile Radio Communications PIMRC, 2017
On the Diversity of Hybrid Narrowband-PLC/Wireless Communications for Smart Grids
Mostafa Sayed, Theodoros A. Tsiftsis, Naofal Al-Dhahir
IEEE Transactions on Wireless Communications, 2017
On the Joint Impact of Hardware Impairments and Imperfect CSI on Successive Decoding
Nikolaos I. Miridakis, Theodoros A. Tsiftsis
IEEE Transactions on Vehicular Technology, 2017
EGC Reception for FSO Systems under Mixture-Gamma Fading Channels and Pointing Errors
Nikolaos I. Miridakis, Theodoros A. Tsiftsis
IEEE Communications Letters, 2017
Distributed Spatial Multiplexing Systems with Hardware Impairments and Imperfect Channel Estimation under Rank-1 Rician Fading Channels
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Corbett Rowell
IEEE Transactions on Vehicular Technology, 2017
Maximizing Spectral Efficiency for Energy Harvesting-Aware WBAN
Hamed Mosavat-Jahromi, Behrouz Maham, Theodoros A. Tsiftsis
IEEE Journal of Biomedical and Health Informatics, 2017
Simultaneous Spectrum Sensing and Data Reception for Cognitive Spatial Multiplexing Distributed Systems
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, George C. Alexandropoulos, Merouane Debbah
IEEE Transactions on Wireless Communications, 2017
Illumination, data transmission, and energy harvesting: The threefold advantage of VLC
Harilaos G. Sandalidis, Alexander Vavoulas, Theodoros A. Tsiftsis, Nicholas Vaiopoulos
Applied Optics, 2017
Relayed FSO communication with aperture averaging receivers and misalignment errors
Prabhat Kumar Sharma, Ankur Bansal, Parul Garg, Theodoros Tsiftsis, Ricardo Barrios
Iet Communications, 2017
Underlay Cognitive Relaying System Over α-μ Fading Channels
Sultangali Arzykulov, Galymzhan Nauryzbayev, Theodoros A. Tsiftsis
IEEE Communications Letters, 2017
On the Capacity of Wireless Powered Cognitive Relay Network with Interference Alignment
Sultangali Arzykulov, Galymzhan Nauryzbayev, Theodoros A. Tsiftsis, Mohamed Abdallah
Proceedings IEEE Global Communications Conference Globecom, 2017
Guest Editorial Spectrum Sharing and Aggregation for Future Wireless Networks, Part III
Theodoros A. Tsiftsis, Guoru Ding, Yulong Zou, George K. Karagiannidis, Zhu Han, Lajos Hanzo
IEEE Journal on Selected Areas in Communications, 2017
Achievable Channel Cutoff Rate and Bandwidth Efficiency in Indoor Wireless Environments
Indrakshi Dey, Theodoros A. Tsiftsis, Corbett Rowell
IEEE Transactions on Vehicular Technology, 2016
Green Cognitive Relaying: Opportunistically Switching between Data Transmission and Energy Harvesting
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, George C. Alexandropoulos, Mérouane Debbah
IEEE Journal on Selected Areas in Communications, 2016
Guest Editorial: Spectrum Sharing and Aggregation for Future Wireless Networks, Part II
Theodoros A. Tsiftsis, Guoru Ding, Yulong Zou, George K. Karagiannidis, Zhu Han, Lajos Hanzo
IEEE Journal on Selected Areas in Communications, 2016
Energy-Efficient Cooperative Network Coding with Joint Relay Scheduling and Power Allocation
Nan Qi, Ming Xiao, Theodoros A. Tsiftsis, Mikael Skoglund, Phuong L. Cao, Lixin Li
IEEE Transactions on Communications, 2016
Antenna beamforming for energy harvesting in cognitive radio networks
Huidong Liu, Jin Chen, Guoru Ding, Theodoros A. Tsiftsis, Corbett Rowell
2016 IEEE MTT S International Wireless Symposium Iws 2016, 2016
Guest Editorial Spectrum Sharing and Aggregation for Future Wireless Networks, Part i
Theodoros A. Tsiftsis, Guoru Ding, Yulong Zou, George K. Karagiannidis, Zhu Han, Lajos Hanzo
IEEE Journal on Selected Areas in Communications, 2016
Secrecy Performance of Wirelessly Powered Wiretap Channels
Xin Jiang, Caijun Zhong, Xiaoming Chen, Trung Q. Duong, Theodoros A. Tsiftsis, Zhaoyang Zhang
IEEE Transactions on Communications, 2016
Energy efficient switching between data transmission and energy harvesting for cooperative cognitive relaying systems
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, George C. Alexandropoulos, Merouane Debbah
2016 IEEE International Conference on Communications Icc 2016, 2016
On the energy efficiency in multi-user multi-relay coded network
Nan Qi, Ming Xiao, Theodoros A. Tsiftsis, Phuong L. Cao, Mikael Skoglund, Lixin Li
2016 23rd International Conference on Telecommunications ICT 2016, 2016
On the Higher Order Statistics of the Channel Capacity in Dispersed Spectrum Cognitive Radio Systems Over Generalized Fading Channels
Theodoros A. Tsiftsis, Fotis Foukalas, George K. Karagiannidis, Tamer Khattab
IEEE Transactions on Vehicular Technology, 2016
Resource allocation for licensed/unlicensed carrier aggregation MIMO systems
Christos G. Tsinos, Fotis Foukalas, Theodoros A. Tsiftsis
IEEE Wireless Communications and Networking Conference Wcnc, 2016
A closed-form solution to implement interference alignment and cancellation scheme for the MIMO three-user X-channel model
Galymzhan Nauryzbayev, Sultangali Arzykulov, Emad Alsusa, Theodoros A. Tsiftsis
2016 10th International Conference on Signal Processing and Communication Systems Icspcs 2016 Proceedings, 2016
Simultaneous spectrum sensing and data transmission for multi-user MIMO cognitive radio systems
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, George C. Alexandropoulos, Merouane Debbah
Proceedings IEEE Global Communications Conference Globecom, 2016
An alignment-based interference cancellation scheme for network-MIMO systems
Galymzhan Nauryzbayev, Sultangali Arzykulov, Emad Alsusa, Theodoros A. Tsiftsis
2016 10th International Conference on Signal Processing and Communication Systems Icspcs 2016 Proceedings, 2016
A Joint Tensor Completion and Prediction Scheme for Multi-Dimensional Spectrum Map Construction
Mengyun Tang, Guoru Ding, Qihui Wu, Zhen Xue, Theodoros A. Tsiftsis
IEEE Access, 2016
Cellular-base-station-assisted device-to-device communications in TV white space
Guoru Ding, Jinlong Wang, Qihui Wu, Yu-Dong Yao, Fei Song, Theodoros A. Tsiftsis
IEEE Journal on Selected Areas in Communications, 2016
Energy detection based spectrum sensing over enriched multipath fading channels
Alireza Bagheri, Paschalis C. Sofotasios, Theodoros A. Tsiftsis, Khuong Ho-Van, Michael I. Loupis, Steven Freear, Mikko Valkama
IEEE Wireless Communications and Networking Conference Wcnc, 2016
Hierarchical resource allocation framework for hyper-dense small cell networks
Junfei Qiu, Guoru Ding, Qihui Wu, Zuping Qian, Theodoros A. Tsiftsis, Zhiyong Du, Youming Sun
IEEE Access, 2016
Deployment of wireless sensor network in dispersed renewable energy sources for increasing efficiency of power distribution networks
Theodoros A. TSIFTSIS, Paschalis C. SOFOTASIOS, Nick PAPANIKOLAOU, Michael I. LOUPIS
Journal of Modern Power Systems and Clean Energy, 2015
Coverage Aspects of Indoor VLC Networks
Alexander Vavoulas, Harilaos G. Sandalidis, Theodoros A. Tsiftsis, Nicholas Vaiopoulos
Journal of Lightwave Technology, 2015
Area under ROC curve of energy detection over generalized fading channels
Alireza Bagheri, Paschalis C. Sofotasios, Theodoros A. Tsiftsis, Ali Shahzadi, Steven Freear, Mikko Valkama
IEEE International Symposium on Personal Indoor and Mobile Radio Communications PIMRC, 2015
Investigation of a Waste Heat Recovery System for a more electric ship
Charoula G. Zogogianni, Dionisis Voglitsis, Stefanos Saridakis, Stylianos P. Syrigos, Nick P. Papanikolaou, Anastasios Kyritsis, Michael Loupis, Theodoros A. Tsiftsis, Emmanuel C. Tatakis
2015 17th European Conference on Power Electronics and Applications EPE Ecce Europe 2015, 2015
AUC study of energy detection based spectrum sensing over η-μ And α-μ fading channels
Alireza Bagheri, Paschalis C. Sofotasios, Theodoros A. Tsiftsis, Ali Shahzadi, Mikko Valkama
IEEE International Conference on Communications, 2015
Spectrum sensing in generalized multipath fading conditions using square-law combining
Alireza Bagheri, Paschalis C. Sofotasios, Theodoros A. Tsiftsis, Ali Shahzadi, Mikko Valkama
IEEE International Conference on Communications, 2015
Performance of FSO links under exponentiated Weibull turbulence fading with misalignment errors
P. K. Sharma, A. Bansal, P. Garg, T. A. Tsiftsis, R. Barrios
IEEE International Conference on Communications, 2015
Wireless powered dual-hop multiple antenna relay transmission in the presence of interference
Guangxu Zhu, Caijun Zhong, Himal A. Suraweera, George K. Karagiannidis, Zhaoyang Zhang, Theodoros A. Tsiftsis
IEEE International Conference on Communications, 2015
Aggregation of Spectrum Opportunities
Florian Kaltenberger, Theodoros A. Tsiftsis, Fotis Foukalas, Shuyu Ping, Oliver Holland
Opportunistic Spectrum Sharing and White Space Access the Practical Reality, 2015
Licensed assisted access: Key enabling functionalities and initial results
Apostolos Galanopoulos, Theodoros Tsiftsis, Fotis Foukalas
Proceedings of the International Symposium on Wireless Communication Systems, 2015
Wireless information and power transfer in relay systems with multiple antennas and interference
Guangxu Zhu, Caijun Zhong, Himal A. Suraweera, George K. Karagiannidis, Zhaoyang Zhang, Theodoros A. Tsiftsis
IEEE Transactions on Communications, 2015
Advances in statistical channel modeling for wireless communications
José F. Paris, Paschalis C. Sofotasios, Theodoros A. Tsiftsis
International Journal of Antennas and Propagation, 2015
Analytic expressions and bounds for special functions and applications in communication theory
Paschalis C. Sofotasios, Theodoros A. Tsiftsis, Yury A. Brychkov, Steven Freear, Mikko Valkama, George K. Karagiannidis
IEEE Transactions on Information Theory, 2014
Inter-band carrier aggregation in heterogeneous networks: Design and assessment
Georgia D. Ntouni, Alexandros-Apostolos A. Boulogeorgos, Dimitrios S. Karas, Theodoros A. Tsiftsis, Fotis Foukalas, Vasileios M. Kapinas, George K. Karagiannidis
2014 11th International Symposium on Wireless Communications Systems Iswcs 2014 Proceedings, 2014
Cooperative spectrum sharing systems with relay selection in the presence of multiple primary receivers
Francisco Rafael Vasconcelos Guimarães, Daniel Benevides da Costa, Mustapha Benjillali, Theodoros A. Tsiftsis, George K. Karagiannidis
Iet Communications, 2014
Free-space optical communication with nonzero boresight pointing errors
Fan Yang, Julian Cheng, Theodoros A. Tsiftsis
IEEE Transactions on Communications, 2014
Error-rate performance analysis of cooperative OFDMA system with decode-and-forward relaying
Muhammad Mehboob Fareed, Murat Uysal, Theodoros A. Tsiftsis
IEEE Transactions on Vehicular Technology, 2014
Multiuser and multirelay cognitive radio networks under spectrum-sharing constraints
F. Rafael V. Guimaraes, Daniel B. da Costa, Theodoros A. Tsiftsis, Charles C. Cavalcante, George K. Karagiannidis
IEEE Transactions on Vehicular Technology, 2014
Analytic solutions to a Marcum Q-function-based integral and application in energy detection of unknown signals over multipath fading channels
Paschalis Sofotasios, Mikko Valkama, Theodoros Tsifitsis, Yury Brychkov, Steven Freear, George Karagiannidis
Proceedings of the 2014 9th International Conference on Cognitive Radio Oriented Wireless Networks and Communications Crowncom 2014, 2014
Distributed orthogonal space-time block coding in wireless relay networks
Hoc Phan, Trung Q. Duong, Hans‐Jürgen Zepernick, Theodoros A. Tsiftsis
Iet Communications, 2013
The κ-μ/IG composite statistical distribution in RF and FSO wireless channels
Paschalis C. Sofotasios, Theodoros A. Tsiftsis, Khuong Ho Van, Steven Freear, Leif R. Wilhelmsson, Mikko Valkama
IEEE Vehicular Technology Conference, 2013
Free-space optical communications with generalized pointing errors
Fan Yang, Julian Cheng, Theodoras A. Tsiftsis
IEEE International Conference on Communications, 2013
Cognitive multihop networks in spectrum sharing environment with multiple licensed users
Kyeong Jin Kim, Trung Q. Duong, Theodoros A. Tsiftsis, Vo Nguyen Quoc Bao
IEEE International Conference on Communications, 2013
On the application of cooperative communications in renewable energy sources for maximizing the reliability of power distribution networks
Theodoros Tsiftsis, Nick Papanikolaou, Michael Loupis, Vasilios Zarikas, , , , and
Journal of Green Engineering, 2013
The η-μ/IG distribution: A novel physical multipath/shadowing fading model
Paschalis C. Sofotasios, Theodoros A. Tsiftsis, Mounir Ghogho, Leif. R. Wilhelmsson, Mikko Valkama
IEEE International Conference on Communications, 2013
Cognitive cooperative networks in dual-hop asymmetric fading channels
Trung Q. Duong, Tran Trung Duy, Michail Matthaiou, Theodoros Tsiftsis, George K. Karagiannidis
Proceedings IEEE Global Communications Conference Globecom, 2013
Best relay selection in cooperative spectrum sharing systems with multiple primary users
F. R. V. Guimaraes, D. B. da Costa, M. Benjillali, T. A. Tsiftsis, G. K. Karagiannidis
IEEE International Conference on Communications, 2013
Energy detection based spectrum sensing over κ-μ and κ-μ extreme fading channels
Paschalis C. Sofotasios, Eric Rebeiz, Li Zhang, Theodoros A. Tsiftsis, Danijela Cabric, Steven Freear
IEEE Transactions on Vehicular Technology, 2013
Noncoherent relay selection for bidirectional cooperative networks
Mehdi Seyfi, Sami Muhaidat, Jie Liang, Theodoros. A. Tsiftsis
2012 IEEE Globecom Workshops GC Wkshps 2012, 2012
Outage and diversity of cognitive relaying systems under spectrum sharing environments in nakagami-m fading
Trung Q. Duong, Daniel Benevides da Costa, Theodoros A. Tsiftsis, Caijun Zhong, A. Nallanathan
IEEE Communications Letters, 2012
Keyhole effect in dual-hop MIMO AF relay transmission with space-time block codes
Trung Q. Duong, Himal A. Suraweera, Theodoros A. Tsiftsis, Hans-Jurgen Zepernick, Arumugam Nallanathan
IEEE Transactions on Communications, 2012
A novel distributed antenna selection scheme for fixed-gain amplify-and-forward relaying systems
Haiyang Ding, Jianhua Ge, Daniel B. da Costa, Theodoros Tsiftsis
IEEE Transactions on Vehicular Technology, 2012
Cooperative wireless personal area network systems with partial best relay selection
Theodoros A. Tsiftsis, Kyeong Jin Kim, Kyung Sup Kwak
Transactions on Emerging Telecommunications Technologies, 2012
Advances in broadband single-carrier transmission techniques: Theory and applications (ABSCTT 2012)
Muhaidat, S., Uysal, Murat, Tsiftsis, T. A., Dianati, M., Abualhaol, I.
2012 25th IEEE Canadian Conference on Electrical and Computer Engineering Vision for A Greener Future Ccece 2012, 2012
On the performance of cyclic-prefixed single-carrier cellular systems in cochannel interference
Kyeong Jin Kim, Yongzhao Li, Theodoros A. Tsiftsis
IEEE Transactions on Vehicular Technology, 2011
Probability of early detection of ultra-wideband positioning sensor networks
T. Hazim, G.K. Karagiannidis, T.A. Tsiftsis
Iet Wireless Sensor Systems, 2011
Semiblind iterative receiver for coded MIMO-OFDM systems
Kyeong Jin Kim, Theodoros A. Tsiftsis, Robert Schober
IEEE Transactions on Vehicular Technology, 2011
Power allocation in cyclic prefixed single-carrier relaying systems
Kyeong Jin Kim, Theodoros A. Tsiftsis, H. Vincent Poor
IEEE Transactions on Wireless Communications, 2011
On the performance of cyclic prefix-based single-carrier cooperative diversity systems with best relay selection
Kyeong Jin Kim, Theodoros A. Tsiftsis
IEEE Transactions on Wireless Communications, 2011
Orthogonal space-time block codes with CSI-assisted amplify-and-forward relaying in correlated Nakagami-m fading channels
Trung Q. Duong, George C. Alexandropoulos, Hans-Jürgen Zepernick, Theodoros A. Tsiftsis
IEEE Transactions on Vehicular Technology, 2011
Effect of feedback delay on amplify-and-forward relay networks with beamforming
Himal A. Suraweera, Theodoros A. Tsiftsis, George K. Karagiannidis, Arumugam Nallanathan
IEEE Transactions on Vehicular Technology, 2011
Performance analysis of QRD-based cyclically prefixed single-carrier transmissions with opportunistic scheduling
Kyeong Jin Kim, Theodoros A. Tsiftsis
IEEE Transactions on Vehicular Technology, 2011
OSTBC transmission in MIMO AF relay systems with keyhole and spatial correlation effects
Trung Q. Duong, Himal A. Suraweera, Theodoros A. Tsiftsis, Hans-Jurgen Zepernick, A. Nallanathan
IEEE International Conference on Communications, 2011
Average rate and outage probability of cyclic prefixed single-carrier opportunistic cooperative diversity systems
Kyeong Jin Kim, Theodoros A. Tsiftsis, George K. Karagiannidis
IEEE International Symposium on Personal Indoor and Mobile Radio Communications PIMRC, 2010
Iterative near maximum-likelihood sequence detection for MIMO optical wireless systems
Nestor D. Chatzidiamantis, Murat Uysal, Theodoros A. Tsiftsis, George K. Karagiannidis
Journal of Lightwave Technology, 2010
Performance analysis of amplify-and-forward MIMO relay networks with transmit antenna selection over nakagami-m channels
Trung Q. Duong, Hans-Jürgen Zepernick, Theodoros A. Tsiftsis, Quoc Bao Vo Nguyen
IEEE International Symposium on Personal Indoor and Mobile Radio Communications PIMRC, 2010
Performance analysis of cyclically prefixed single-carrier transmissions with outdated opportunistic user selection
Kyeong Jin Kim, Theodoros A. Tsiftsis
IEEE Signal Processing Letters, 2010
Outage probability of MIMO AF relay networks over Nakagami-m fading channels
T.Q. Duong, G.C. Alexandropoulos, T.A. Tsiftsis, H.-J. Zepernick
Electronics Letters, 2010
Amplify-and-forward MIMO relaying with OSTBC over Nakagami-m fading channels
T. Q. Duong, H.-J. Zepernick, T. A. Tsiftsis, V. N. Q. Bao
IEEE International Conference on Communications, 2010
Relaying utilization metrics of diamond cooperative diversity systems
Theodoros A. Tsiftsis, Zoran Hadzi-Velkov, George K. Karagiannidis, Nikola Zlatanov
ISWPC 2010 IEEE 5th International Symposium on Wireless Pervasive Computing 2010, 2010
Average spectral efficiency of opportunistic QRD-based cyclic prefixed single-carrier cooperative diversity systems with power allocation
Kyeong Jin Kim, Theodoros A. Tsiftsis, George K. Karagiannidis
Globecom IEEE Global Telecommunications Conference, 2010
Effect of feedback delay on downlink amplify-and-forward relaying with beamforming
Himal A. Suraweera, Theodoros A. Tsiftsis, George K. Karagiannidis, Michael Faulkner
Globecom IEEE Global Telecommunications Conference, 2009
EM-based maximum-likelihood sequence detection for MIMO optical wireless systems
N. D. Chatzidiamantis, M. Uysal, T. A. Tsiftsis, G. K. Karagiannidis
IEEE International Conference on Communications, 2009
Optical wireless communications with heterodyne detection over turbulence channels with pointing errors
H.G. Sandalidis, T.A. Tsiftsis, G.K. Karagiannidis
Journal of Lightwave Technology, 2009
Performance analysis of free-space optical communication systems over atmospheric turbulence channels
H.E. Nistazakis, T.A. Tsiftsis, G.S. Tombras
Iet Communications, 2009
Optical wireless links with spatial diversity over strong atmospheric turbulence channels
Theodoros A. Tsiftsis, Harilaos G. Sandalidis, George K. Karagiannidis, Murat Uysal
IEEE Transactions on Wireless Communications, 2009
Adaptive generalized selection combining (A-GSC) receivers
Athanasios Lioumpas, George Karagiannidis, Theodoros Tsiftsis
IEEE Transactions on Wireless Communications, 2008
FSO links with spatial diversity over strong atmospheric turbulence channels
T. A. Tsiftsis, H. G. Sandalidis, G. K. Karagiannidis, M. Uysal
IEEE International Conference on Communications, 2008
Performance analysis of wireless multihop diversity systems
Diomidis S. Michalopoulos, Theodoros A. Tsiftsis
International Journal of Communication Systems, 2008
Performance of wireless multihop communications systems with cooperative diversity over fading channels
Theodoros A. Tsiftsis
International Journal of Communication Systems, 2008
Distributed transmit antenna selection (DTAS) under performance or energy consumption constraints
Diomidis Michalopoulos, George Karagiannidis, Theodoros Tsiftsis, Ranjan Mallik
IEEE Transactions on Wireless Communications, 2008
Performance of heterodyne wireless optical communication systems over gamma-gamma atmospheric turbulence channels
T.A. Tsiftsis
Electronics Letters, 2008
Performance analysis of dual-diversity receivers over correlated generalised Gamma fading channels
P.S. Bithas, N.C. Sagias, T.A. Tsiftsis
Iet Communications, 2008
Outage probability and ergodic capacity of free-space optical links over strong turbulence
H.G. Sandalidis, T.A. Tsiftsis
Electronics Letters, 2008
BER performance of FSO links over strong atmospheric turbulence channels with pointing errors
H.G. Sandalidis, T.A. Tsiftsis, G.K. Karagiannidis, M. Uysal
IEEE Communications Letters, 2008
Introducing PHY-layer fairness in amplify and forward cooperative diversity systems
D. S. Michalopoulos, G. K. Karagiannidis, T. A. Tsiftsis
IEEE International Conference on Communications, 2007
Wireless transmissions with combined gain relays over fading channels
Theodoros A. Tsiftsis, George K. Karagiannidis, Stavros A. Kotsopoulos
IFIP International Federation for Information Processing, 2006
New results on the performance evaluation of the relay fading channel
IEEE Vehicular Technology Conference, 2006
An optimized user selection method for cooperative diversity systems
Diomidis S. Michalopoulos, George K. Karagiannidis, Theodoros A. Tsiftsis, Ranjan K. Mallik
Globecom IEEE Global Telecommunications Conference, 2006
On the performance analysis of equal-gain diversity receivers over generalized Gamma fading channels
N.C. Sagias, G.K. Karagiannidis, P.T. Mathiopoulos, T.A. Tsiftsis
IEEE Transactions on Wireless Communications, 2006
Outage probability of relayed free space optical communication systems
G.K. Karagiannidis, T.A. Tsiftsis, H.G. Sandalidis
Electronics Letters, 2006
Nonregenerative dual-hop cooperative links with selection diversity
Theodoros A Tsiftsis, George K Karagiannidis, P Takis Mathiopoulos, Stavros A Kotsopoulos
Eurasip Journal on Wireless Communications and Networking, 2006
Closed-form statistics for the sum of squared Nakagami-m variates and its applications
G.K. Karagiannidis, N.C. Sagias, T.A. Tsiftsis
IEEE Transactions on Communications, 2006
New results for wireless multihop diversity systems
12th European Wireless Conference 2006 Enabling Technologies for Wireless Multimedia Communications European Wireless 2006, 2006
Bounds for multihop relayed communications in Nakagami-m fading
G.K. Karagiannidis, T.A. Tsiftsis, R.K. Mallik
IEEE Transactions on Communications, 2006
Multihop free-space optical communications over strong turbulence channels
Theodoros Tsiftsis, Harilaos Sandalidis, George Karagiannidis, Nikos Sagias
IEEE International Conference on Communications, 2006
Dual-hop wireless communications with combined gain relays
T.A. Tsiftsis, G.K. Karagiannidis, S.A. Kotsopoulos
IEE Proceedings Communications, 2005
Closed-form bounds for multihop relayed communications in Nakagami-m fading
IEEE International Conference on Communications, 2005
A closed-form upper-bound for the distribution of the weighted sum of Rayleigh variates
G.K. Karagiannidis, T.A. Tsiftsis, N.C. Sagias
IEEE Communications Letters, 2005
Performance of broadband multihop networks with cooperative diversity over fading channels
Proceedings of the 5th International Network Conference INC 2005, 2005
Multihop communications with fixed-gain relays over generalized fading channels
Globecom IEEE Global Telecommunications Conference, 2004
Dual hop wireless communications over nakagami fading
IEEE Vehicular Technology Conference, 2004
BER analysis of collaborative dual-hop wireless transmissions
T.A. Tsiftsis, G.K. Karagiannidis, S.A. Kotsopoulos, F.-N. Pavlidou
Electronics Letters, 2004

THEODOROS TSIFTSIS

Scopus Publications

RECENT SCHOLAR PUBLICATIONS

MOST CITED SCHOLAR PUBLICATIONS