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Intelligent reflecting surfaces (IRSs), active and/or passive, can be denselydeployed in complex environments to significantly enhance wireless networkcoverage for both wireless information transfer (WIT) and wireless powertransfer (WPT). In this letter, we study the downlink WIT/WPT from amulti-antenna base station to a single-antenna user over a multi-active/passiveIRS (AIRS/PIRS)-enabled wireless link. In particular, we aim to optimize thelocation of the AIRS with those of the other PIRSs being fixed to maximize thereceived signal-to-noise ratio (SNR) and signal power at the user in the casesof WIT and WPT, respectively. We derive the optimal solutions for these twocases in closed-form, which reveals that the optimal AIRS deployment isgenerally different for WIT versus WPT. Furthermore, both analytical andnumerical results are provided to show the conditions under which the proposedAIRS deployment strategy yields superior performance to other baselinedeployment strategies as well as the conventional all- PIRS enabled WIT/WPT.

Multi-Active/Passive-IRS Enabled Wireless Information and Power Transfer: Active IRS Deployment and Performance Analysis