3 papers
eess.SP2026
Structured Channel Parameter Estimation for RIS-Assisted MIMO Systems via Kronecker and Tensor Factorizations
Melryllin G. O. Sousa, Jean C. S. Ferreira, Fazal-E Asim
This paper proposes structured channel-parameter estimators for reconfigurable intelligent surface (RIS)-assisted multiple-input multiple-output (MIMO) systems employing uniform re…
eess.SP2026
Low-Complexity Channel Parameter Estimation for Coprime HRIS-Assisted MIMO Systems
Jean C. S. Ferreira, Melryllin G. O. Sousa, Fazal-E Asim
This paper proposes a parameter estimation scheme for uplink MIMO systems assisted by a Hybrid Reconfigurable Intelligent Surface (HRIS). To reduce hardware complexity, the HRIS em…
astro-ph.HE2026
A high-resolution X-ray view of the ultra-fast outflow in MAXI J1810-222
C. Pinto, M. Del Santo, A. D'Aì +10
In previous work, it was reported that the Galactic black hole candidate MAXI J1810-222 exhibited a notable absorption spectral feature at around 1 keV in low-resolution X-ray spec…