Multi-band sensing has emerged as a key enabler of integrated sensing and communication (ISAC), one of the six primary usage scenarios defined for IMT-2030 (6G). The introduction of frequency range 3 (FR3, 7-24 GHz), comprising non-contiguous sub-bands across a wide frequency span, further reinforces the importance of multi-band operation. In such scenarios, frequency-dependent clutter, collectively referred to as dense multipath components (DMC), must be carefully considered. Building on prior literature and our experimental observations, this paper analyzes the impact of DMC on multi-band fusion ISAC systems by investigating Cram\'er-Rao bound (CRB)-based fundamental limits and the performance of our proposed multi-band estimator. Numerical results show that multi-band processing, especially in DMC-dominated scenarios, can substantially reduce estimation error and boost system resilience when channel statistics vary.
@article{arxiv.2604.27265,
title = {Impact of Background Dense Multipath Components on Multi-Band Fusion ISAC Systems},
author = {Dexin Wang and Roberto Bomfin and Ahmad Bazzi and Marwa Chafii},
journal= {arXiv preprint arXiv:2604.27265},
year = {2026}
}
Comments
submitted to GLOBECOM 2026 - 2026 IEEE Global Communications Conference, Macau, China