Dr. Evangelos Vlachos
Tenure-track Researcher · ATHENA RC
Dr. Evangelos Vlachos
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Research
New Paper: Energy-efficiency maximization of hybrid massive MIMO precoding with random-resolution DACs via RF selection
This research introduces a novel hybrid massive MIMO precoding architecture using random-resolution DACs and RF selection to maximize energy-efficiency while preserving spectral-efficiency.
Feb 1, 2021
1 min read
Paper
Energy-Efficiency Maximization of Hybrid Massive MIMO Precoding With Random-Resolution DACs via RF Selection
Energy-efficiency (EE) is identified as a key 5G metric and will have a major impact on the hybrid beam- forming system design. The most …
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DOI
Joint Bit Allocation and Hybrid Beamforming Optimization for Energy Efficient Millimeter Wave MIMO Systems
In this article, we aim to design highly energy efficient end-to-end communication for millimeter wave multiple- input multiple-output …
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DOI
New Paper: Privacy preservation in industrial IoT via fast adaptive correlation matrix completion
This study develops a fast adaptive method for completing correlation matrices in industrial IoT networks, preserving privacy by adding noise that maximizes uncertainty while maintaining structural information.
Dec 1, 2020
1 min read
Paper
New Paper: Radio-frequency chain selection for energy and spectral efficiency maximization in hybrid beamforming under hardware imperfections
Researchers develop an algorithm to optimize radio-frequency chain selection for efficient wireless transmission while minimizing hardware imperfections.
Dec 1, 2020
1 min read
Paper
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 …
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DOI
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