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arXiv · 2609.29846

Physical-Layer Aspects of Repeater-Assisted MIMO

Diana P. M. Osorio·Kohei Ueda·Anubhab Chowdhury·Hiroki Iimori·Yuto Hama·Koji Ishibashi·Erik G. Larsson
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Abstract

Network-controlled repeaters (NCRs) are emerg- ing as low-cost, band-selective active scatterers that can re- shape the wireless propagation environment without backhaul or tight phase synchronization. We study physical-layer design for repeater-assisted multiple-input multiple-output (RA-MIMO) networks, such as hardware impairments, gain and activation control, duplexing, channel-state information acquisition, and wideband delay effects. We then discuss integrated sensing and communication (ISAC), where repeaters can extend non- line-of-sight (NLoS) visibility, improve target observability, and enhance weak-echo detection. These gains, however, are limited by amplified noise, clutter, feedback, and calibration errors, motivating joint optimization and gain control frameworks for swarm repeater deployments within ISAC.

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Diana P. M. Osorio, Kohei Ueda, Anubhab Chowdhury, Hiroki Iimori, Yuto Hama, Koji Ishibashi, Erik G. Larsson. 2026-09-24. Physical-Layer Aspects of Repeater-Assisted MIMO. https://arxiv.org/abs/2609.29846

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