Christos N. Efrem

33 papers B 1Journal 28Unranked 3
YearRankTypeTitle / Venue / Authors
2026 J jnl
Joint Power Allocation and Reflecting-Element Activation for Energy Efficiency Maximization in IRS-Aided Communications Under CSI Uncertainty.
IEEE Commun. Lett.
Christos N. Efrem, Ioannis Krikidis
2026 J jnl
Modulation Design for Integrated SWIPT Receivers With OFDM-Based Waveforms.
IEEE Open J. Commun. Soc.
Maria Dimitropoulou, Christos N. Efrem, Constantinos Psomas, Ioannis Krikidis
2024 B conf
Power Peak Position Modulation for SWIPT Networks with OFDM-based Waveforms.
GLOBECOM
Maria Dimitropoulou, Christos N. Efrem, Constantinos Psomas, Ioannis Krikidis
2024 J jnl
Robust IRS-Element Activation for Energy Efficiency Optimization in IRS-Assisted Communication Systems With Imperfect CSI.
IEEE Trans. Wirel. Commun.
Christos N. Efrem, Ioannis Krikidis
2024 J jnl
Transmit and Receive Antenna Port Selection for Channel Capacity Maximization in Fluid-MIMO Systems.
CoRR
Christos N. Efrem, Ioannis Krikidis
2024 J jnl
Transmit and Receive Antenna Port Selection for Channel Capacity Maximization in Fluid-MIMO Systems.
IEEE Wirel. Commun. Lett.
Christos N. Efrem, Ioannis Krikidis
2023 — conf
Global Optimization of Energy Efficiency in IRS-Aided Communication Systems via Robust IRS-Element Activation.
ICC
Christos N. Efrem, Ioannis Krikidis
2023 J jnl
Joint IRS Location and Size Optimization in Multi-IRS Aided Two-Way Full-Duplex Communication Systems.
IEEE Trans. Wirel. Commun.
Christos N. Efrem, Ioannis Krikidis
2023 J jnl
Recurrence relations for the joint distribution of the sum and maximum of independent random variables.
CoRR
Christos N. Efrem
2023 J jnl
Robust IRS-Element Activation for Energy Efficiency Optimization in IRS-Assisted Communication Systems With Imperfect CSI.
CoRR
Christos N. Efrem, Ioannis Krikidis
2022 J jnl
Capacity Allocation Mechanisms in High-Throughput Satellite Systems: One-to-Many Pairings.
IEEE Syst. J.
Anargyros J. Roumeliotis, Christos N. Efrem, Charilaos I. Kourogiorgas, Athanasios D. Panagopoulos
2022 J jnl
Global Optimization of Energy Efficiency in IRS-Aided Communication Systems via Robust IRS-Element Activation.
CoRR
Christos N. Efrem, Ioannis Krikidis
2022 — conf
IRS Deployment Optimization in Multi-IRS Assisted Two-Way Full-Duplex Communication Systems.
ICC
Christos N. Efrem, Ioannis Krikidis
2022 J jnl
Joint IRS Location and Size Optimization in Multi-IRS Aided Two-Way Full-Duplex Communication Systems.
CoRR
Christos N. Efrem, Ioannis Krikidis
2022 J jnl
Minimization of nth Order Rate Matching in Satellite Networks with One to Many Pairings.
Future Internet
Anargyros J. Roumeliotis, Christos N. Efrem, Athanasios D. Panagopoulos
2021 J jnl
Minimization of Losses and Rate Matching in Satellite Networks With One to Many Pairings.
IEEE Wirel. Commun. Lett.
Anargyros J. Roumeliotis, Christos N. Efrem, Charilaos I. Kourogiorgas, Athanasios D. Panagopoulos
2021 J jnl
Minimizing the Installation Cost of Ground Stations in Satellite Networks: Complexity, Dynamic Programming and Approximation Algorithm.
IEEE Wirel. Commun. Lett.
Christos N. Efrem, Athanasios D. Panagopoulos
2021 J jnl
On the Computation and Approximation of Outage Probability in Satellite Networks With Smart Gateway Diversity.
IEEE Trans. Aerosp. Electron. Syst.
Christos N. Efrem, Athanasios D. Panagopoulos
2021 — —
Optimization algorithm design and performance analysis for next-generation wireless networks
Christos N. Efrem
2020 J jnl
Dynamic Energy-Efficient Power Allocation in Multibeam Satellite Systems.
IEEE Wirel. Commun. Lett.
Christos N. Efrem, Athanasios D. Panagopoulos
2020 J jnl
Globally Optimal Selection of Ground Stations in Satellite Systems With Site Diversity.
IEEE Wirel. Commun. Lett.
Christos N. Efrem, Athanasios D. Panagopoulos
2020 J jnl
Minimizing the Installation Cost of Ground Stations in Satellite Networks: Complexity, Dynamic Programming and Approximation Algorithm.
CoRR
Christos N. Efrem, Athanasios D. Panagopoulos
2020 J jnl
On the Computation and Approximation of Outage Probability in Satellite Networks with Smart Gateway Diversity.
CoRR
Christos N. Efrem, Athanasios D. Panagopoulos
2020 J jnl
Optimizing the Ground Network of Optical MEO Satellite Communication Systems.
IEEE Syst. J.
Nikolaos K. Lyras, Christos N. Efrem, Charilaos I. Kourogiorgas, Athanasios D. Panagopoulos, Pantelis-Daniel M. Arapoglou
2019 J jnl
A Framework for Weighted-Sum Energy Efficiency Maximization in Wireless Networks.
CoRR
Christos N. Efrem, Athanasios D. Panagopoulos
2019 J jnl
A Framework for Weighted-Sum Energy Efficiency Maximization in Wireless Networks.
IEEE Wirel. Commun. Lett.
Christos N. Efrem, Athanasios D. Panagopoulos
2019 J jnl
Dynamic Energy-Efficient Power Allocation in Multibeam Satellite Systems.
CoRR
Christos N. Efrem, Athanasios D. Panagopoulos
2019 J jnl
Energy Efficiency Optimization: A New Trade-Off Between Fairness and Total System Performance.
IEEE Wirel. Commun. Lett.
Christos N. Efrem, Athanasios D. Panagopoulos
2019 J jnl
Energy Efficiency Optimization: A New Trade-off Between Fairness and Total System Performance.
CoRR
Christos N. Efrem, Athanasios D. Panagopoulos
2019 J jnl
Globally Optimal Selection of Ground Stations in Satellite Systems with Site Diversity.
CoRR
Christos N. Efrem, Athanasios D. Panagopoulos
2019 J jnl
Medium earth orbit optical satellite communication networks: Ground terminals selection optimization based on the cloud-free line-of-sight statistics.
Int. J. Satell. Commun. Netw.
Nikolaos K. Lyras, Christos N. Efrem, Charilaos I. Kourogiorgas, Athanasios D. Panagopoulos
2018 — conf
Joint Power Allocation and Transmission Time Selection in Duty-cycled Wireless Sensor Networks.
GIIS
Christos N. Efrem, Athanasios D. Panagopoulos
2018 J jnl
Optimum Monthly Based Selection of Ground Stations for Optical Satellite Networks.
IEEE Commun. Lett.
Nikolaos K. Lyras, Christos N. Efrem, Charilaos I. Kourogiorgas, Athanasios D. Panagopoulos