In terms of modern applications of wireless sensor networks in smart cities, relay terminals can be employed to\nsimultaneously deliver both information and energy to a designated receiver by harvesting power via radio frequency\n(RF). In this paper, we propose time switching aware channel (TSAC) protocol and consider a dual-hop full-duplex (FD)\nrelaying system, where the energy constrained relay node is powered by RF signals from the source using decodeand-\nforward (DF) relaying protocols. In order to evaluate system performance, we provide an analytical expression of\nthe achievable throughput of two different communication modes, including instantaneous transmission and delayconstrained\ntransmission. In addition, the optimal harvested power allocation policies are studied for these transmission\nmodes. Most importantly, we propose a novel energy harvesting (EH) policy based on FD relaying which can substantially\nboost the system throughput compared to the conventional half-duplex (HD) relaying architecture in other transmission\nmodes. Numerical results illustrate that our proposed protocol outperforms the conventional protocol under the\noptimal received power for energy harvesting at relay. Our numerical findings verify the correctness of our derivations\nand also prove the importance of FD transmission mode.
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