Joint Power Allocation and Transmission Time Selection in Duty-cycled Wireless Sensor Networks. - Christos N. Efrem; Athanasios D. Panagopoulos (GIIS, 2018)

Optimum Monthly Based Selection of Ground Stations for Optical Satellite Networks. - Nikolaos K. Lyras; Christos N. Efrem; Charilaos I. Kourogiorgas; Athanasios D. Panagopoulos (IEEE Commun. Lett., 2018)

Medium earth orbit optical satellite communication networks: Ground terminals selection optimization based on the cloud-free line-of-sight statistics. - Nikolaos K. Lyras; Christos N. Efrem; Charilaos I. Kourogiorgas; Athanasios D. Panagopoulos (Int. J. Satell. Commun. Netw., 2019)

A Framework for Weighted-Sum Energy Efficiency Maximization in Wireless Networks. - Christos N. Efrem; Athanasios D. Panagopoulos (IEEE Wirel. Commun. Lett., 2019)

Energy Efficiency Optimization: A New Trade-Off Between Fairness and Total System Performance. - Christos N. Efrem; Athanasios D. Panagopoulos (IEEE Wirel. Commun. Lett., 2019)

Optimizing the Ground Network of Optical MEO Satellite Communication Systems. - Nikolaos K. Lyras; Christos N. Efrem; Charilaos I. Kourogiorgas; Athanasios D. Panagopoulos; Pantelis-Daniel M. Arapoglou (IEEE Syst. J., 2020)

Dynamic Energy-Efficient Power Allocation in Multibeam Satellite Systems. - Christos N. Efrem; Athanasios D. Panagopoulos (IEEE Wirel. Commun. Lett., 2020)

Globally Optimal Selection of Ground Stations in Satellite Systems With Site Diversity. - Christos N. Efrem; Athanasios D. Panagopoulos (IEEE Wirel. Commun. Lett., 2020)

On the Computation and Approximation of Outage Probability in Satellite Networks With Smart Gateway Diversity. - Christos N. Efrem; Athanasios D. Panagopoulos (IEEE Trans. Aerosp. Electron. Syst., 2021)

Minimizing the Installation Cost of Ground Stations in Satellite Networks: Complexity, Dynamic Programming and Approximation Algorithm. - Christos N. Efrem; Athanasios D. Panagopoulos (IEEE Wirel. Commun. Lett., 2021)

Minimization of Losses and Rate Matching in Satellite Networks With One to Many Pairings. - Anargyros J. Roumeliotis; Christos N. Efrem; Charilaos I. Kourogiorgas; Athanasios D. Panagopoulos (IEEE Wirel. Commun. Lett., 2021)

Optimization algorithm design and performance analysis for next-generation wireless networks - Christos N. Efrem (2021)

IRS Deployment Optimization in Multi-IRS Assisted Two-Way Full-Duplex Communication Systems. - Christos N. Efrem; Ioannis Krikidis (ICC, 2022)

Minimization of nth Order Rate Matching in Satellite Networks with One to Many Pairings. - Anargyros J. Roumeliotis; Christos N. Efrem; Athanasios D. Panagopoulos (Future Internet, 2022)

Capacity Allocation Mechanisms in High-Throughput Satellite Systems: One-to-Many Pairings. - Anargyros J. Roumeliotis; Christos N. Efrem; Charilaos I. Kourogiorgas; Athanasios D. Panagopoulos (IEEE Syst. J., 2022)

Global Optimization of Energy Efficiency in IRS-Aided Communication Systems via Robust IRS-Element Activation. - Christos N. Efrem; Ioannis Krikidis (ICC, 2023)

Recurrence relations for the joint distribution of the sum and maximum of independent random variables. - Christos N. Efrem (CoRR, 2023)

Joint IRS Location and Size Optimization in Multi-IRS Aided Two-Way Full-Duplex Communication Systems. - Christos N. Efrem; Ioannis Krikidis (IEEE Trans. Wirel. Commun., 2023)

Power Peak Position Modulation for SWIPT Networks with OFDM-based Waveforms. - Maria Dimitropoulou; Christos N. Efrem; Constantinos Psomas; Ioannis Krikidis (GLOBECOM, 2024)

Robust IRS-Element Activation for Energy Efficiency Optimization in IRS-Assisted Communication Systems With Imperfect CSI. - Christos N. Efrem; Ioannis Krikidis (IEEE Trans. Wirel. Commun., 2024)

Transmit and Receive Antenna Port Selection for Channel Capacity Maximization in Fluid-MIMO Systems. - Christos N. Efrem; Ioannis Krikidis (IEEE Wirel. Commun. Lett., 2024)