Abstract
Internet of Things nodes need new charging methods, and RF energy is not well utilized. Backscatter can harvest RF energy from the environment and use the idle spectrum to realize wireless power supply communication. In this article, each enhanced backscatter device (eBD) can select from a variety of cooperative receivers (CR) to provide different transmission services in three modes: energy harvesting (EH), relay communication (RelayCom), and backscatter communication (BackCom). To analyze the throughput of the secondary network, we model the three working modes, respectively. We describe the problem as the objective function of three variables: the period α of EH when there are no obstacles, period μ of RelayCom with obstacles, and period γ of BackCom with obstacles. The ideal time allocation strategy is then investigated. Then, we apply the particle swarm optimization algorithm to obtain a solution that maximizes the throughput. The simulation results show that compared to the communication network using backscatter or relay protocol alone, the proposed backscatter-assisted wireless relay communication model can greatly improve the throughput and coverage of the secondary system.
Highlights
With the development of the Internet of Things, more and more Internet of Things nodes need to be connected to the network
We assume that the efficiency η of data transmission in the RelayCom mode of enhanced backscatter device (eBD) is 0.7, the signal bandwidth B is 20 MHz, circuit energy loss Ec in cycle μ is 0.001 W, and additive Gaussian white noise ω~bðn Þ is negligible in the performance analysis
In two modes of RelayCom and backscatter communication (BackCom), firstly, we study the relationship between the total transmission rate T of eBD and three parameters α, μ, and γ in a unit period and the maximum achievable transmission rate T and the values of the corresponding three parameters α, μ, and γ
Summary
With the development of the Internet of Things, more and more Internet of Things nodes need to be connected to the network. Backscatter-assisted wireless communication consumes relatively little power due to the combination of a backscatter transmitter and an energy collection device It realizes data forwarding and transmission by switching three transmission modes: energy harvesting, active relay transmission, and environmental backscatter. Reference [8] constructed a model of hybrid backscatter assisted cognitive wireless network and studied the optimal time allocation between backscatter mode and energy harvesting mode when the channel is busy. It obtained the optimal combination of working modes. To improve the reliability of backscatter communication and the signal transmission duration of wireless energy supply relay, this paper studies the hybrid mode of backscatter assisted relay communication in obstacle environments.
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