Dr. Evangelos Vlachos
Tenure-track Researcher · ATHENA RC
Dr. Evangelos Vlachos
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New Paper: Improving wideband massive mimo channel estimation with uav state-space information
The paper improves massive MIMO channel estimation by leveraging UAV state-space information to mitigate the effects of beam squint and enhance wideband channel accuracy.
Oct 1, 2025
1 min read
Paper
New Paper: Biconvex Optimization for Time-Domain Channel Estimation Under Dual-Wideband Fading Conditions
This research develops a biconvex optimization approach to estimate time-domain MIMO channel matrices under dual-wideband fading conditions, addressing beam squint and ISI effects in single-carrier point-to-point systems.
Sep 8, 2025
1 min read
Paper
New Paper: Time-domain channel estimation for extremely large MIMO THz communication systems under dual-wideband fading conditions
The paper presents a unified time-domain framework for estimating MIMO channel matrices in extremely large THz systems under dual-wideband fading conditions, mitigating beam squint and inter-symbol interference.
Sep 8, 2025
1 min read
Paper
New Paper: Flexible hybrid precoding for integrated sensing and communications
Researchers propose flexible hybrid precoding schemes to optimize joint sensing and communication performance in resource-constrained wireless systems.
Jul 1, 2025
1 min read
Paper
New Paper: Receiving RISs: Enabling channel estimation and autonomous configuration
A novel channel estimation protocol enables autonomous configuration of semi-passive Reconfigurable Intelligent Surfaces for receiving pilot signals in multi-antenna systems, leveraging beamspace sparsity and low-rank properties.
Jul 1, 2025
1 min read
Paper
Receiving RISs: Enabling Channel Estimation and Autonomous Configuration
This work addresses semi-passive Reconfigurable Intelligent Surface (RIS) architectures enhanced with radio-frequency (RF) chains for …
DOI
Biconvex Optimization for Time-Domain Channel Estimation Under Dual-Wideband Fading Conditions
Single-carrier (SC) waveforms offer significant ad- vantages in high-frequency communications due to their lower peak-to-average power …
PDF
DOI
Flexible Hybrid Precoding for Integrated Sensing and Communications
Key Contributions
Presents flexible hybrid precoding architectures for Integrated Sensing and Communications (ISAC), enabling simultaneous radar sensing and multi-user data transmission from a shared antenna array.
Develops optimization frameworks that balance sensing beampattern design with communication spectral efficiency under practical hardware constraints including finite-resolution phase shifters.
Provides a comprehensive treatment of ISAC precoding in a book chapter context, covering design principles, algorithmic solutions, and trade-off analysis for next-generation wireless systems.
Improving Wideband Massive MIMO Channel Estimation With UAV State-Space Information
In this paper, we focus on the estimation of massive Multiple-Input Multiple-Output (mMIMO) channels in high-frequency point-to-point …
PDF
DOI
Intelligent UAV Path Planning for Ergodic Rate Maximization of MIMO Multipath Channels
Reliable communication between ground control stations and unmanned aerial vehicles (UAVs) is fundamental for safe, autonomous, and …
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