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eess.SP2024
Exploiting Mutual Coupling Characteristics for Channel Estimation in Holographic MIMO
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 clos…
eess.SP2024
Spatial Frequencies and Degrees of Freedom: Their Roles in Near-Field Communications
Alva Kosasih, Özlem Tuğfe Demir, Nikolaos Kolomvakis +1
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. This fac…
eess.SP2024
Nonlinear Distortion Radiated from Large Arrays and Active Reconfigurable Intelligent Surfaces
Nikolaos Kolomvakis, Alva Kosasih, Emil Björnson
Extremely large aperture arrays (ELAAs) and reconfigurable intelligent surfaces (RISs) are candidate enablers to realize connectivity goals for the sixth-generation (6G) wireless n…