arXiv Machine Learning

HELENA for 5G NR LEO NTN Channel Estimation: A Comparative Evaluation

arXiv AI
Aug 25

DRIFT: Joint Channel Estimation and Prediction Towards Pilotless 6G Non-Terrestrial Networks

The paper introduces DRIFT, a lightweight framework for joint channel estimation and prediction in low Earth orbit non-terrestrial networks, aiming to reduce pilot overhead by using data-driven processing after the initial slot. DRIFT refines data-aided channel estimates and forecasts future channel responses with low computational cost, offering two variants based on convolutional and LSTM layers. Simulations show up to 12% spectral efficiency gain over conventional pilot-based systems, with under 200k multiply-accumulate operations suitable for on-board satellite implementation.

By Bruno De Filippo, Carla Amatetti, Alessandro Vanelli-Coralli
arXiv AI
Aug 20

Structure-Informed Estimation for Pilot-Limited MIMO Channels via Tensor Decomposition

The paper introduces a hybrid estimator for pilot‑limited MIMO channel estimation that frames the problem as low‑rank tensor completion from sparse pilot data. It compares Canonical Polyadic (CP) and Tucker decompositions, showing CP excels for specular channels while Tucker offers stability under extreme pilot scarcity. A lightweight 3D U‑Net is added to capture residual components, and the combined Tensor–NN approach achieves significant NMSE improvements over conventional methods across various pilot densities and channel models.

By Alexandre Barbosa de Lima
arXiv Machine Learning
Aug 7

EqDeepRx: Learning a Scalable and Interference Mitigating MIMO Receiver

arXiv:2602. 11834v2 Announce Type: replace-cross Abstract: While machine learning (ML)-based receiver algorithms have received a great deal of attention in the recent literature, they often suffer from poor scaling with increasing spatial multiplexing order and lack of explainability and generalization.

By Mikko Honkala, Dani Korpi, Elias Raninen, Janne M. J. Huttunen
arXiv AI
2d ago

Channel-Dependent State Space Model for Multivariate Time Series Forecasting

The paper introduces Chameleon, a channel‑dependent state space model for multivariate time series forecasting that allows data‑dependent, fine‑grained interactions across variables while maintaining linear scaling with the number of variables. By integrating selective state space models with a Kalman filter and adapting GatedDeltaNet as the backbone, Chameleon improves generalization and achieves lower MSE and MAE on strongly dependent ODE and PEMS datasets compared to both channel‑independent and prior channel‑dependent methods. Across 28 benchmark settings, it outperforms baselines in the majority of cases and demonstrates competitive training‑time and memory efficiency on Traffic and ETT datasets.

By Yu-Cheng Wu, Fan-Keng Sun, Li-Chun Lu, Duane S. Boning
arXiv AI
Sep 11

Improving 5G AI-RAN MCS Selection by Predicting Retransmissions

The paper introduces NOSTRAdAMUS, a predictive link‑adaptation framework for 5G NR that forecasts retransmissions in the next radio frame using recent HARQ history and adjusts the Modulation and Coding Scheme accordingly. Gradient Boosting models achieve 82.9% overall accuracy, with high‑confidence predictions correct 94.2% of the time and a 5.5 µs inference latency. Evaluated OTA on the X5G testbed and various channel emulators, the approach boosts goodput by up to 71.5% and cuts retransmissions by up to 71.8% without retraining across diverse scenarios.

By Tamerlan Aghayev, Maxime Elkael, Michele Polese, Reshma Prasad, Salvatore D'Oro, Yunseong Lee, Koichiro Furueda, Tommaso Melodia
arXiv Computer Vision
4d ago

Training-Free Bottleneck Width Planning for Convolutional Autoencoders

The paper introduces Multiscale Spectral Rate‑Distortion (MS‑SRD), a training‑free method that predicts the required bottleneck channel width for convolutional autoencoders at user‑specified spatial cuts, using only training images and a normalized mean‑squared error bound. MS‑SRD’s covariance‑tail rule is exact for shared linear block‑convolutional autoencoders under squared error, and a nested‑scale dominance result allows reporting an activation‑parameter Pareto frontier alongside the minimal‑latent candidate. Across thirteen grayscale datasets, the method achieves a 0.84% mean absolute percentage error in latent‑size prediction, with most predictions exact or within one channel, and demonstrates comparable performance to retrospective external widths in deployable comparisons without any training of a selector.

By Guannan Guo