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Wireless networks-on-chip (WNoCs) are an enticing complementary interconnecttechnology for multi-core chips but face severe resource constraints. Beinglimited to simple on-off-keying modulation, the reverberant nature of the chipenclosure imposes limits on allowed modulation speeds in sight of inter-symbolinterference, casting doubts on the competitiveness of WNoCs as interconnecttechnology. Fortunately, this vexing problem was recently overcome byparametrizing the on-chip radio environment with a reconfigurable intelligentsurface (RIS). By suitably configuring the RIS, selected channel impulseresponses (CIRs) can be tuned to be (almost) pulse-like despite rich scatteringthanks to judiciously tailored multi-bounce path interferences. However, theexploration of this "over-the-air" (OTA) equalization is thwarted by (i) theoverwhelming complexity of the propagation environment, and (ii) the non-lineardependence of the CIR on the RIS configuration, requiring a costly and lengthyfull-wave simulation for every optimization step. Here, we show that areduced-basis physics-compliant model for RIS-parametrized WNoCs can becalibrated with a single full-wave simulation. Thereby, we unlock thepossibility of predicting the CIR for any RIS configuration almostinstantaneously without any additional full-wave simulation. We leverage thisnew tool to systematically explore OTA equalization in RIS-parametrized WNoCsregarding the optimal choice of delay time for the RIS-shaped CIR's peak. Wealso study the simultaneous optimization of multiple on-chip wireless links forbroadcasting. Looking forward, the introduced tools will enable the efficientexploration of various types of OTA analog computing in RIS-parametrized WNoCs.

Systematic Physics-Compliant Analysis of Over-the-Air Channel Equalization in RIS-Parametrized Wireless Networks-on-Chip