2026-04-14T05:52:01Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/4209932026-01-24T03:57:30Zcom_2072_1033col_2072_452950

urn:hdl:2117/420993 RIS-based over-the-air channel equalization in resource-constrained wireless networks Prod'homme, Hugo Imani, Mohammadreza Abadal Cavallé, Sergi Del Hougne, Philipp Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telemàtica i xarxes d'ordinadors Reconfigurable intelligent surface Resouce-constrained networks Wireless network-on-chip Physics compliant channel model Over-the-air channel equalization Analog wave-based computing Rich scattering yields long channel impulse responses (CIRs) with many taps that thwart communications in resource-constrained wireless networks limited to simple on-off-keying: the modulation rate must be throttled to avoid inter-symbol interference. Relevant examples include Internet-of-Things (IoT) networks and wireless networks-on-chips (WNoCs). If the radio environment is parametrized by a reconfigurable intelligent surface (RIS), the RIS configuration can be optimized to tailor the CIR between selected antenna pairs and make it (almost) pulse-like despite rich scattering by judiciously engineering the interferences of the multi-bounce paths. Thereby, the channel is equalized “over the air” in the physical domain, unlike conventional pre- and/or post-coding strategies. Here, using a physics-compliant model of a RIS-parametrized rich-scattering environment, we explore how the optimal choice of the time delay at which the CIR is shaped to have its most significant tap depends on the amount of reverberation in the environment and the latter's specific geometry. S. A. acknowledges support from the EU’s Horizon Europe program through the European Research Council (ERC) under grant agreement 101042080 (WINC). Peer Reviewed Postprint (author's final draft) 2024 Conference report https://ieeexplore.ieee.org/document/10501013 info:eu-repo/grantAgreement/EC/HE/101042080/EU/Wireless Networks within Next-Generation Computing Systems/WINC Open Access Institute of Electrical and Electronics Engineers (IEEE)