Throughput Maximization in Full-Duplex Dual-Hop Wireless Powered Communication Networks

Abstract

In this paper, we consider a dual-hop wireless powered communication network (DH-WPCN) with a full duplex (FD) hybrid access point (HAP), which can transmit energy to the energy-constrained relays and receive information from the users assisted by the relays simultaneously. Under the setting, we propose an efficient relaying scheme, following which a relay can always harvest energy from the HAP only except the time slot that it forwards the user's information to the HAP. After that, we investigate the system throughout maximization problems for both cases that the relays adopt the amplify-and-forward (AF) mode and the decode-and-forward (DF) mode. To obtain the optimal time allocation between the downlink energy transfer from HAP to relays and the uplink information transmission from users to HAP, we then propose a low-complexity algorithm to solve the formulated problems. Moreover, we prove that the DF mode leads to a higher system throughput than the AF mode theoretically. Simulation results demonstrate the superiority of the proposed scheme compared with the benchmark schemes. INDEX TERMS Wireless powered communication network, full duplex, dual-hop, optimal time allocation.

Performance Analysis and Resource Allocations for a WPCN With a New Nonlinear Energy Harvester Model

“…The linear EH model is the de facto standard for most works [6], [8], [10], [15]- [18]. It assumes that the output power of the energy harvester increases linearly with the input RF signal power.…”

“…Resource allocations have been extensively investigated for EH systems [6], [8], [10], [16], [31], [37], [41]. However, some of them consider the simple linear EH model, for which the resource allocation problems are relatively easy to solve [6], [8], [10], [16]. Resource allocation schemes highly depend on accurate mathematical models for the RF EH circuits and the discrepancy between the properties of practical nonlinear EH circuits and the linear EH model may cause performance degradation in practical implementation due to the drastic resource allocation mismatches [42].…”

Wireless Powered Mobile Edge Computing for Industrial Internet of Things Systems

“…The current wireless network architectures and conventional cloud-based systems are far from being satisfactory to meet the demands of these emerging applications in terms of data collection, delivery, and analysis. To support new requirements and unleash the potential of IIoT, new business models are being created with both focuses on mobile edge computing (MEC) [4]- [7] and wireless power transfer (WPT) [8]- [10] technologies.…”

“…Some articles have noticed these limitations and provided up-to-date surveys to tackle the emerging challenges. In particular, the authors in [9] described four future extensions of the wireless powered communication network (WPCN) [8]- [10], which include full-duplex, multi-antenna, cognitive, and large-scale WPCN, to address the energy scarcity problem from an IoT point of view. Aazam et al in [1] gave an overview architecture of IIoT on the definition, application and also architecture with the support of fog computing.…”

MMSE‐based transmission method for wireless powered communication networks

“…With the energy limitation in traditional wireless networks, a wireless powered communication network (WPCN) was presented for solving this problem [11]. Under a dual‐hop WPCN with a full‐duplex hybrid access point (HAP), a reliable relaying method was proposed in [13]. Based on this method, the time slots of user information were sent to the HAP, and the energy of a relay was obtained from HAP.…”