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Uplink Pre-Compensation for Ground-to-Space Optical Communications Using Downlink Tomographic Reconstruction
Alex Frost, Nicolas Maron, Shane Walsh, Benjamin Dix-Matthews, Sascha Schediwy, Michael Hart
https://arxiv.org/abs/2509.08866

Uplink Pre-Compensation for Ground-to-Space Optical Communications Using Downlink Tomographic Reconstruction
Uplink pre-compensation in ground-to-satellite optical links remains a problem, with an appropriate measurement of the wavefront error in the uplink path often not being available. We present a method that uses successive measurements of the readily accessible downlink beam to perform a tomographic reconstruction of the volume of atmosphere common to the downlink beam and the ground-station field-of-view. These measurements are done through the existing downlink wavefront sensor. From here, an …

RSMA-Enhanced Data Collection in RIS-Assisted Intelligent Consumer Transportation Systems
Chunjie Wang, Xuhui Zhang, Wenchao Liu, Jinke Ren, Shuqiang Wang, Yanyan Shen, Kejiang Ye, Kim Fung Tsang
https://arxiv.org/abs/2509.09644

RSMA-Enhanced Data Collection in RIS-Assisted Intelligent Consumer Transportation Systems
This paper investigates the data collection enhancement problem in a reconfigurable intelligent surface (RIS)-empowered intelligent consumer transportation system (ICTS). We propose a novel framework where a data center (DC) provides energy to pre-configured roadside unit (RSU) pairs during the downlink stage. While in the uplink stage, these RSU pairs utilize a hybrid rate-splitting multiple access (RSMA) and time-division multiple access (TDMA) protocol to transmit the processed data to the D…

Joint Beamforming Optimization for Pinching-Antenna Systems (PASS)-assisted Symbiotic Radio
Ze Wang, Guoping Zhang, Hongbo Xu
https://arxiv.org/abs/2508.07002 https://

Joint Beamforming Optimization for Pinching-Antenna Systems (PASS)-assisted Symbiotic Radio
This paper investigates a novel downlink symbiotic radio (SR) framework empowered by the pinching antenna system (PASS), aiming to enhance both primary and secondary transmissions through reconfigurable antenna positioning. PASS consists of multiple waveguides equipped with numerous low-cost pinching antennas (PAs), whose positions can be flexibly adjusted to simultaneously manipulate large-scale path loss and signal phases.We formulate a joint transmit and pinching beamforming optimization pro…

Crosslisted article(s) found for astro-ph.IM. https://arxiv.org/list/astro-ph.IM/new
[1/1]:
- Uplink Pre-Compensation for Ground-to-Space Optical Communications Using Downlink Tomographic Rec...
Alex Frost, Nicolas Maron, Shane Walsh, Benjamin Dix-Matthews, Sascha Schediwy, Michael Ha…

🇺🇦 Auf radioeins läuft...
Bon Iver feat. Danielle Haim:
🎵 If Only I Could Wait
#NowPlaying #BonIver #DanielleHaim
https://open.spotify.com/track/06o2hgwnRJN0HYelhyVsLm

Dean of LLM Tutors: Exploring Comprehensive and Automated Evaluation of LLM-generated Educational Feedback via LLM Feedback Evaluators
Keyang Qian, Yixin Cheng, Rui Guan, Wei Dai, Flora Jin, Kaixun Yang, Sadia Nawaz, Zachari Swiecki, Guanliang Chen, Lixiang Yan, Dragan Ga\v{s}evi\'c
https://arxiv.org/abs/2508.05952

Dean of LLM Tutors: Exploring Comprehensive and Automated Evaluation of LLM-generated Educational Feedback via LLM Feedback Evaluators
The use of LLM tutors to provide automated educational feedback to students on student assignment submissions has received much attention in the AI in Education field. However, the stochastic nature and tendency for hallucinations in LLMs can undermine both quality of learning experience and adherence to ethical standards. To address this concern, we propose a method that uses LLM feedback evaluators (DeanLLMs) to automatically and comprehensively evaluate feedback generated by LLM tutor for su…

Modeling Optical Key Distribution over a Satellite-to-Ground Link Under Weak Atmospheric Turbulence
Artur Czerwinski, Miko{\l}aj Lasota, Marcin Jarzyna, Mateusz Kucharczyk, Micha{\l} Jachura, Konrad Banaszek
https://arxiv.org/abs/2508.05807

Modeling Optical Key Distribution over a Satellite-to-Ground Link Under Weak Atmospheric Turbulence
In this study, we analyze the secret key capacity of intensity modulation/direct detection optical key distribution (IM/DD OKD) for a free-space optical (FSO) link between a low-Earth orbit satellite and an optical ground station. Focusing on downlink communication, we account for atmospheric turbulence, which causes random variations in the transmittance of the FSO channel. We implement an atmospheric channel model that accounts for absorption and scattering, geometric losses, pointing errors,…

Integrating Phase-Coherent Multistatic Imaging in Downlink D-MIMO Networks
Dario Tagliaferri, Silvia Mura, Musa Furkan Keskin, Sauradeep Dey, Henk Wymeersch
https://arxiv.org/abs/2510.04240

Integrating Phase-Coherent Multistatic Imaging in Downlink D-MIMO Networks
This paper addresses the challenge of integrating multistatic coherent imaging functionalities in the downlink (DL) of a phase-coherent distributed multiple input multiple output (D-MIMO) communication network. During DL, the D-MIMO access points (APs) jointly precode the transmitted signals to maximize the spectral efficiency (SE) at the users (UEs) locations. However, imaging requires that \textit{(i)} a fraction of the APs work as receivers for sensing and \textit{(ii)} the transmitting APs …

Performance Analysis for Multi-User Holographic MIMO Downlink with Matched Filter Precoding
Gayathri Shekar, Saman Atapattu, Prathapasinghe Dharmawansa, Kandeepan Sithamparanathan
https://arxiv.org/abs/2510.04530

Performance Analysis for Multi-User Holographic MIMO Downlink with Matched Filter Precoding
Holographic MIMO (HMIMO) has emerged as a promising solution for future wireless systems by enabling ultra-dense, spatially continuous antenna deployments. While prior studies have primarily focused on electromagnetic (EM) modeling or simulation-based performance analysis, a rigorous communication-theoretic framework remains largely unexplored. This paper presents the first analytical performance study of a multi-user HMIMO downlink system with matched filter (MF) precoding - a low-complexity b…

Replaced article(s) found for eess.SP. https://arxiv.org/list/eess.SP/new
[1/1]:
- Downlink MIMO Channel Estimation from Bits: Recoverability and Algorithm
Rajesh Shrestha, Mingjie Shao, Mingyi Hong, Wing-Kin Ma, Xiao Fu