Abstract
Since radio frequency (RF) signals can be used for both information transmission and energy harvesting, RF-based energy harvesting is capable of integrating with other existing communication techniques for providing better rate–energy tradeoff and quality-of-service. Within the context of an RF-based energy harvesting relaying network, a relay node not only acts as an intermediate node to help the delivery from source to destination, but also harvests energy from an RF dedicated source to prolong its lifetime. Thus, it brings diversity gain and coverage extension as well as provides extra energy for data transmission. This paper investigates a system that enables ambient backscattering communication-assisted simultaneous wireless information and power transfer at the relay. In the proposed system, a backscatter device plays a role as a relay to meet sustainable network coverage and to harvest ambient energy as well. With a power splitting (PS) scheme, we first investigate a nonlinear energy harvesting model at the relay node. In order to adapt to the channel gains, a dynamic PS ratio is required to perform well in changing environments. Moreover, we derive mathematical expressions for the outage probability and the achievable system throughput. Numerical results show the effects of various system parameters on the outage probability and the system throughput performance.
Highlights
Energy harvesting (EH) has been known as a promising solution for overcoming energy crisis in the future [1,2,3]
Simulation results are presented to illustrate the effects of several factors on the performance of derived outage probabilities in Equations (37), (39)
We study recent results of SWIPT and ambient backscatter communication (AmBC) protocols, propose a hybrid system that combines both protocols in radio frequency (RF)-based relaying network
Summary
Energy harvesting (EH) has been known as a promising solution for overcoming energy crisis in the future [1,2,3]. A radio frequency (RF) energy harvester converts dedicated RF power to electricity, it can be used as a power supply of devices with low power consumption. The RF-EH offers various benefits such as clean and cheap energy, while prolongs the network operation time of the traditional battery. A wireless device harvests energy from ambient RF signals from certain time instants and frequencies. It has been shown that RF energy has several advantages over battery recharging/replacement or other energy sources [2]. This is because the RF energy harvester converts the ambient RF energy to electricity that can reduce the extra operational or maintenance cost. Wireless systems exploit RF waves for information delivery, they use the same RF signals for both information decoding (ID) and EH receivers with the SWIPT structure
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