Dr. Evangelos Vlachos
Tenure-track Researcher · ATHENA RC
Dr. Evangelos Vlachos
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Research
New Paper: Joint localization and channel estimation for UAV-assisted millimeter wave communications
This research develops a novel joint localization and channel estimation framework for UAV-assisted mmWave communications, enabling accurate positioning and MIMO channel coefficient estimation through beam-space representation and matrix completion.
Nov 1, 2020
1 min read
Paper
New Paper: Energy efficiency maximization in millimeter wave hybrid MIMO systems for 5G and beyond
A novel energy-efficient beamformer maximizes millimeter wave hybrid MIMO system performance by optimizing DAC resolution and RF chain selection using Dinkelbach method and subset selection optimization.
Oct 27, 2020
1 min read
Paper
New Paper: A hardware architecture for reconfigurable intelligent surfaces with minimal active elements for explicit channel estimation
A novel hardware architecture for reconfigurable intelligent surfaces minimizes active elements while enabling explicit channel estimation, a crucial step towards programmable wireless environments.
May 1, 2020
1 min read
Paper
New Paper: Wideband channel tracking for millimeter wave massive MIMO systems with hybrid beamforming reception
A novel matrix-completion-based approach enables efficient wideband channel tracking in millimeter wave massive MIMO systems with hybrid beamforming reception, reducing training periods while maintaining accurate estimation.
May 1, 2020
1 min read
Paper
A Hardware Architecture For Reconfigurable Intelligent Surfaces with Minimal Active Elements for Explicit Channel Estimation
Intelligent surfaces comprising of cost effective, nearly pas- sive, and reconfigurable unit elements are lately gaining in- creasing …
PDF
DOI
Joint Localization and Channel Estimation for UAV-Assisted Millimeter Wave Communications
In this paper, we consider millimeter Wave (mmWave) communications between an Unmanned Aerial Ve- hicle (UA V) and a base station. By …
PDF
DOI
Radio-frequency chain selection for energy and spectral efficiency maximization in hybrid beamforming under hardware imperfections
The next-generation wireless communications require reduced energy consumption, increased data rates and better signal coverage. The …
PDF
DOI
Wideband Channel Tracking for Millimeter Wave Massive Mimo Systems with Hybrid Beamforming Reception
Millimeter Wave (mmWave) massive Multiple Input Multi- ple Output (MIMO) channel tracking is a challenging task with Hybrid analog and …
PDF
DOI
New Paper: Dynamic RF chain selection for energy efficient and low complexity hybrid beamforming in millimeter wave MIMO systems
This paper introduces a novel dynamic RF chain selection framework that maximizes energy efficiency and minimizes complexity in millimeter wave MIMO systems through fractional programming and Dinkelbach method-based optimization.
Dec 1, 2019
1 min read
Paper
New Paper: Energy efficient ADC bit allocation and hybrid combining for millimeter wave MIMO systems
This research optimizes ADC bit allocation and hybrid combining in millimeter wave MIMO systems, achieving highly energy-efficient solutions through a novel decomposition approach.
Dec 1, 2019
1 min read
Paper
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