Search Results for author: Nikolaos Kolomvakis

Found 3 papers, 0 papers with code

Exploiting Mutual Coupling Characteristics for Channel Estimation in Holographic MIMO

no code implementations18 Dec 2024 Nikolaos Kolomvakis, Emil Björnson

Holographic multiple-input multiple-output (MIMO) systems represent a spatially constrained MIMO architecture with a massive number of antennas with small antenna spacing as a close approximation of a spatially continuous electromagnetic aperture.

The Roles of Spatial Frequencies and Degrees-of-Freedom in Near-Field Communications

no code implementations10 Jul 2024 Alva Kosasih, Özlem Tuğfe Demir, Nikolaos Kolomvakis, Emil Björnson

As wireless technology begins to utilize physically larger arrays and/or higher frequencies, the transmitter and receiver will reside in each other's radiative near field.

Nonlinear Distortion Radiated from Large Arrays and Active Reconfigurable Intelligent Surfaces

no code implementations23 Jan 2024 Nikolaos Kolomvakis, Alva Kosasih, Emil Björnson

In this paper, we study the distortion created by nonlinear amplifiers in both ELAAs and active RIS.

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