Channel Estimation with Asynchronous Reception for User-Centric Cell-Free MIMO Systems
Abstract
The user-centric, cell-free wireless network is a promising next-generation communication system, but signal synchronization issues arise due to distributed access points and lack of cellular structure. We propose a novel method to recover synchronous pilot reception by introducing new pilot sequences and a matched filter window, enabling orthogonality even with asynchronous reception. Our approach mimics synchronous transmission by extending training sequences. Analysis shows asynchronous reception's impact on channel estimation, and our method significantly improves performance with a small increase of training time overhead. Results demonstrate a 7.26 dB reduction in normalized mean square error and 40% increase in data rate, achieving performance levels comparable to the synchronous case.
Cite
@article{arxiv.2506.05496,
title = {Channel Estimation with Asynchronous Reception for User-Centric Cell-Free MIMO Systems},
author = {Xuyang Sun and Hussein A. Ammar and Raviraj Adve and Israfil Bahceci and Gary Boudreau},
journal= {arXiv preprint arXiv:2506.05496},
year = {2025}
}
Comments
To be presented in IEEE International Conference on Communications (IEEE ICC) 2025