Abstract
This paper proposes a wireless powered communication network (WPCN) assisted by backscatter communication (BackCom). This model consists of a power station, an information receiver and multiple users that can work in either BackCom mode or harvest-then-transmit (HTT) mode. The time block is mainly divided into two parts corresponding to the data backscattering and transmission periods, respectively. The users first backscatter data to the information receiver in time division multiple access (TDMA) during the data backscattering period. When one user works in the BackCom mode, the other users harvest energy from the power station. During the data transmission period, two schemes, i.e., non-orthogonal multiple access (NOMA) and TDMA, are considered. To maximize the system throughput, the optimal time allocation policies are obtained. Simulation results demonstrate the superiority of the proposed model.
Highlights
With the development of Internet of Things (IoT), wireless sensor networks (WSNs) have received a lot of attention [1,2,3,4,5,6,7,8,9,10]
We propose a general wireless powered communication network (WPCN) assisted by backscatter communication (BackCom), where both BackCom and HTT modes are employed at the users
Fiρfi and gi = 10 dbi ρbi, where d f i is the distance between Ui and the power station, dbi is the distance between Ui and the information receiver, ρ f i and ρbi are the channel short-term fadings, ρ2f i and ρ2bi are exponentially distributed random variables with unit mean
Summary
With the development of Internet of Things (IoT), wireless sensor networks (WSNs) have received a lot of attention [1,2,3,4,5,6,7,8,9,10]. With the development of RF-based WPT techniques, wireless powered communication networks (WPCNs) have been proposed [9,10]. In a WPCN, there are typically a hybrid access point (HAP) with stable energy sources and multiple users with supercapacitors To make this network operate, the “harvest--transmit” (HTT) mode including energy harvesting and data transmission periods was proposed in [9]. The time is fully exploited for information transmission Both NOMA and TDMA schemes are considered during the data transmission period of the HTT mode. The optimal time allocation policies are derived to maximize the system throughput
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