T HIS second of the two issues on wireless transmission of information and power starts with some works on Simultaneous Wireless Information and Power Transfer (SWIPT), then switches to Wirelessly Powered Communication Networks (WPCNs), and finishes with a few works on Wirelessly Powered Backscatter Communication (WPBC).Zhou et al. formulate a secrecy rate maximization problem for amplify-and-forward (AF) relaying with SWIPT based on directional modulation.The optimization problem is not convex and hence is difficult to solve.The paper provides various solutions (some close to optimal) for this problem under various settings.Deng et al. analyze the energy and rate meta distributions in a Wireless Information and Power Transfer (WIPT)-enabled device-to-device (D2D) network where D2D users are modeled by a Poisson bipolar network and ambient RF transmitters are modeled by a Poisson point process.The new performance measure is the meta distribution of the transferred energy, which is the distribution of the conditional energy outage probability given the locations of the RF transmitters.A new notion of transmission efficiency is also introduced and exploited to design such a WIPT-enabled D2D network.
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