Transceiver Design for Cell-Free Unsourced Random Access

Mert Ozates; Mohammad Kazemi; Eduard Jorswieck; Deniz Gündüz

Transceiver Design for Cell-Free Unsourced Random Access

Signal Processing 2026-08-10 v1

Authors: Mert Ozates , Mohammad Kazemi , Eduard Jorswieck , Deniz Gündüz

Abstract

We propose a low-complexity, energy-efficient solution for cell-free unsourced random access (URA), in which multiple distributed access points are connected to a central processing unit via a fronthaul. Assuming that each user transmits a pilot sequence followed by a polar codeword whose symbols are placed to the data part of the frame according to an on-off pattern, we utilize iterative decoding, including orthogonal matching pursuit (OMP)-based pilot detection and channel estimation, symbol estimation using a linear minimum mean square error (MMSE) solution, symbol combining, single-user decoding, and successive interference cancellation (SIC). We also present finite blocklength (FBL) performance and detailed complexity analyses. Numerical results demonstrate that the FBL analysis properly characterizes system performance and that the proposed cell-free URA scheme offers superior performance compared to existing low-complexity schemes. Namely, it offers a superior performance of up to 4.5 dB and can accommodate up to 1800 active users.

Keywords

cell-free unsourced random access transceiver design iterative decoding orthogonal matching pursuit finite blocklength

Cite

@article{arxiv.2608.10159,
  title  = {Transceiver Design for Cell-Free Unsourced Random Access},
  author = {Mert Ozates and Mohammad Kazemi and Eduard Jorswieck and Deniz Gündüz},
  journal= {arXiv preprint arXiv:2608.10159},
  year   = {2026}
}