242 citations · 365 across the 28 of their papers we have counts for
7 papers · 1 filter
Coverage Probability of Double-IRS Assisted Communication Systems
Anastasios Papazafeiropoulos, Pandelis Kourtessis, Symeon Chatzinotas +1
In this paper, we focus on the coverage probability of a double-intelligent reflecting surface (IRS) assisted wireless network and study the impact of multiplicative beamforming ga…
Scalable Cell-Free Massive MIMO Systems: Impact of Hardware Impairments
Anastasios Papazafeiropoulos, Emil Björnson, Pandelis Kourtessis +2
Standard cell-free (CF) multiple-input-multiple-output (mMIMO) systems is a promising technology to cover the demands for higher data rates in fifth-generation (5G) networks and be…
Asymptotic Analysis of Max-Min Weighted SINR for IRS-Assisted MISO Systems with Hardware Impairments
Anastasios Papazafeiropoulos, Cunhua Pan, Ahmet Elbir +3
We focus on the realistic maximization of the uplink minimum signal-to-interference-plus-noise ratio (SINR) of a general multiple-input single-output (MISO) system assisted by an i…
A Hybrid Architecture for Federated and Centralized Learning
Ahmet M. Elbir, Sinem Coleri, Anastasios K. Papazafeiropoulos +2
Many of the machine learning tasks rely on centralized learning (CL), which requires the transmission of local datasets from the clients to a parameter server (PS) entailing huge c…
Multipair Two-Way DF Relaying with Cell-Free Massive MIMO
Anastasios K. Papazafeiropoulos, Pandelis Kourtessis, Symeon Chatzinotas +1
We consider a two-way half-duplex decode-and-forward (DF) relaying system with multiple pairs of single-antenna users assisted by a cell-free (CF) massive multiple-input multiple-o…
Coverage Probability of Distributed IRS Systems Under Spatially Correlated Channels
Anastasios Papazafeiropoulos, Cunhua Pan, Ahmet Elbir +3
This paper suggests the use of multiple distributed intelligent reflecting surfaces (IRSs) towards a smarter control of the propagation environment. Notably, we also take into acco…
Intelligent Reflecting Surface-assisted MU-MISO Systems with Imperfect Hardware: Channel Estimation, Beamforming Design
Anastasios Papazafeiropoulos, Cunhua Pan, Pandelis Kourtessis +2
Most works in IRS-assisted systems have ignored the impact of the inevitable residual hardware impairments (HWIs) at both the transceiver hardware and the IRS while any relevant wo…