RIS-Aided Non-Cooperative Multi-Base Station Multi-User ISAC Scheme
Yihong Liu, Dongqi Luo, Feifei Gao · IEEE Transactions on Vehicular Technology · 2025
Multi-base station (MB) serving multi-user (MU) would be the most important scenario in the integrated sensing and communication (ISAC) scheme. However, removing MB interference (MBI) and MU interference (MUI) requires intricate MB cooperation, which results in a nontrivial overhead. In this paper, we propose to tackle MB and MU interference (MBMUI) by minimizing the sum of the received power at both communication and sensing receivers while keeping the amplitude of the signal of interest with a single reconfigurable intelligent surface (RIS). Specifically, we build the cell-free RIS-aided ISAC transmission model and then derive a closed-form RIS beamformer to minimize MBMUI. Simulation results show that a single RIS can significantly minimize MBMUI while maintaining multi-path phase alignment and achieving a better signal-to-interference-plus-noise ratio (SINR) of sensing and communication than the existing methods.