Harvest-Then-Cooperate: Wireless-Powered Cooperative Communications


In this paper, we think about a wireless-powered cooperative communication network consisting of 1 hybrid access-point (AP), one supply, and one relay. In contrast to traditional cooperative networks, the supply and relay within the considered network don't have any embedded energy provide. They would like to depend on the energy harvested from the signals broadcasted by the AP for his or her cooperative info transmission. Based on this three-node reference model, we propose a harvest-then-cooperate (HTC) protocol, in which the supply and relay harvest energy from the AP within the downlink and work cooperatively within the uplink for the supply's data transmission. Considering a delay-restricted transmission mode, the approximate closed-kind expression for the common throughput of the proposed protocol is derived over Rayleigh fading channels. Subsequently, this analysis is extended to the multi-relay situation, where the approximate throughput of the HTC protocol with two widespread relay choice schemes comes. The asymptotic analyses for the throughput performance of the considered schemes at high signal-to-noise radio also are provided. All theoretical results are validated by numerical simulations. The impacts of the system parameters, such as time allocation, relay range, and relay position, on the throughput performance are extensively investigated.

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