Delay-Doppler Domain Channel Estimation: What if Sparsity is Unknown?

This silver document is an arXiv RSS bundle (multiple new submissions) focused on communications, coding, and ML for wireless systems and related applications. Key contributions include: a sparsity-agnostic delay–Doppler channel estimator exploiting Cartesian-product DD support; a low-complexity sequential automorphism-ensemble decoder with early stopping for reduced AED complexity; a new metric (confidential reconstruction accuracy) and analysis for joint accuracy/confidentiality in remote reconstruction with wiretap/eavesdropper models; artificial-noise aided designs for movable-antenna (MA)