3 papers
cs.IT2026
Channel Estimation for OTFS Systems With Overspread Doppler Shifts
Preety Priya, Yi Hong, Emanuele Viterbo
In this paper, we consider an orthogonal time frequency space (OTFS) system in time-varying channels with overspread Doppler shifts, typically found in non-terrestrial multi-satell…
astro-ph.HE2026
X-ray Doppler tomography of Fe K emission in a low-mass X-ray binary 4U 1822-371 - a localized reflector at the accretion stream-disk overflow
N. Sameshima, M. Tsujimoto, M. Uemura
We present the X-ray Doppler tomography of the Fe K (6.4 keV) fluorescence line of the low-mass X-ray binary 4U 1822-371 obtained with XRISM. Eleven orbits of this short period…
astro-ph.SR2026
JWST-DECO: Temporal Variations in the Mid-IR Silicate Features of Two T Tauri Discs Based on Spitzer and JWST observations
N. Sameshima, T. Miyata, T. Kamizuka +9
Mid-infrared spectra of planet-forming discs commonly show prominent silicate emission, whose spectral shape is sensitive to the disc temperature distribution as well as its minera…