3 papers
cs.IT2026
An Orthogonal Approximate Message Passing Framework for Multiuser Communications
Burak Ãakmak, Hao Yan, Alexander Fengler +2
We solve the open problem of constructing a Bayes-optimal iterative signal recovery algorithm for linear-Gaussian \emph{multiuser} communication systems with random precoding at th…
cs.IT2025
Sparse Regression LDPC Codes for the Block-Fading Non-Coherent SIMO Channel
Alexander Fengler, Burak Ãakmak, Giuseppe Caire
Sparse regression codes (SPARCs) are a class of codes that encode information through the superposition of columns of a randomised coding matrix. The combination with an outer non-…
cs.IT2025
Removal of Small Weight Stopping Sets for Asynchronous Unsourced Multiple Access
Frederik Ritter, Jonathan Mandelbaum, Alexander Fengler +2
In this paper, we analyze the formation of small stopping sets in joint factor graphs describing a frame-asynchronous two-user transmission. Furthermore, we propose an algorithm to…