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eess.SP2025
Joint Power Allocation and Reflecting-Element Activation for Energy Efficiency Maximization in IRS-Aided Communications Under CSI Uncertainty
Christos N. Efrem, Ioannis Krikidis
We study the joint power allocation and reflecting element (RE) activation to maximize the energy efficiency (EE) in communication systems assisted by an intelligent reflecting sur…
eess.SP2024
Transmit and Receive Antenna Port Selection for Channel Capacity Maximization in Fluid-MIMO Systems
Christos N. Efrem, Ioannis Krikidis
In this letter, we study a discrete optimization problem, namely, the maximization of channel capacity in fluid multiple-input multiple-output (fluid-MIMO) systems through the sele…
eess.SP2023
Robust IRS-Element Activation for Energy Efficiency Optimization in IRS-Assisted Communication Systems With Imperfect CSI
Christos N. Efrem, Ioannis Krikidis
In this paper, we study an intelligent reflecting surface (IRS)-aided communication system with single-antenna transmitter and receiver, under imperfect channel state information (…