scholarly journals Time and Power Allocation for Energy Efficiency Maximization in Wireless-Powered Full-Duplex Relay Systems

2019 ◽  
Vol 11 (10) ◽  
pp. 205
Author(s):  
Song ◽  
Ni ◽  
Han ◽  
Qin ◽  
Dong
Keyword(s):  
Energy Efficiency ◽  
Energy Harvesting ◽  
Power Allocation ◽  
Full Duplex ◽  
Optimal Time ◽  
Wireless Power ◽  
Time Switching ◽  
Relay Systems ◽  
Single Antenna ◽  
Wireless Power Supply

In this paper, we propose an optimal time and power allocation scheme in a wireless power supply full-duplex (FD) relay system, where we consider the number of relay antennas in the energy harvesting stage. At the same time, the energy efficiency optimization problem of the system is structured, where optimization issues related to time allocation factors and power allocation are established. For the FD dual-antenna and the FD single-antenna energy harvesting system, energy efficiency function is proven to be a concave function over the time-switch factor, and the optimal time-switching factor is theoretically obtained using the Lambert function. Then, according to the given value range of the optimal time switching factor, the optimal power distribution scheme is obtained by analyzing the derivative function of the system energy efficiency and using the properties of the Lambert function. The time-switching factor and transmission power are optimally selected at the wireless power supply FD relay. Results reveal that the performance of energy efficiency of the dual-antenna energy harvesting at the FD relay outperforms that of the single-antenna. Moreover, our results demonstrate that FD relay systems always substantially boost the energy efficiency compared with half-duplex (HD) relay systems.

scholarly journals Research Issues, Challenges, and Opportunities of Wireless Power Transfer-Aided Full-Duplex Relay Systems

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 8870-8881 ◽  
Author(s):  
Zhongxiang Wei ◽  
Xu Zhu ◽  
Sumei Sun ◽  
Yufei Jiang ◽  
Ahmed Al-Tahmeesschi ◽  
...  
Keyword(s):  
Wireless Power Transfer ◽  
Full Duplex ◽  
Power Transfer ◽  
Wireless Power ◽  
Research Issues ◽  
Relay Systems ◽  
Challenges And Opportunities ◽  
Full Duplex Relay

scholarly journals Performance Enhancement for Full-Duplex Relaying with Time-Switching-Based SWIPT in Wireless Sensors Networks

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3847
Author(s):  
Phu Tran Tin ◽  
Tan N. Nguyen ◽  
Dinh-Hieu Tran ◽  
Miroslav Voznak ◽  
Van-Duc Phan ◽  
...  
Keyword(s):  
Performance Enhancement ◽  
Maximal Ratio Combining ◽  
Full Duplex ◽  
Selection Combining ◽  
Optimal Time ◽  
Decode And Forward ◽  
Time Switching ◽  
Outage Performance ◽  
Optimal Dynamic ◽  
Dynamic Time

Full-duplex (FD) with simultaneous wireless information and power transfer (SWIPT) in wireless ad hoc networks has received increased attention as a technology for improving spectrum and energy efficiency. This paper studies the outage performance for a SWIPT-based decode-and-forward (DF) FD relaying network consisting of a single-antenna source S, a two-antenna relay R, and a multi-antenna destination D. Specifically, we propose four protocols, namely static time-switching factor with selection combining (STSF-SC), static time-switching factor with maximal ratio combining (STSF-MRC), optimal dynamic time-switching factor with selection combining (ODTSF-SC), and optimal dynamic time-switching factor with maximal ratio combining (ODTSF-MRC) to fully investigate the outage performance of the proposed system. In particular, the optimal time-switching factor from the ODTSF-SC and ODTSF-MRC methods is designed to maximize the total received data at the destination. In this context, we derive exact closed-formed expressions for all schemes in terms of the outage probability (OP). Finally, the Monte Carlo simulations are conducted to corroborate the theoretical analysis’s correctness and the proposed schemes’ effectiveness.

scholarly journals Secrecy Performance Maximization for Underlay CR Networks with an Energy Harvesting Jammer

Sensors ◽  
2021 ◽  
Vol 21 (24) ◽  
pp. 8198
Author(s):  
Juan Sun ◽  
Shubin Zhang ◽  
Kaikai Chi
Keyword(s):  
Energy Harvesting ◽  
Power Allocation ◽  
Time Allocation ◽  
Information Transfer ◽  
Optimization Problems ◽  
Optimal Time ◽  
Secrecy Rate ◽  
Transmit Power ◽  
Rf Energy Harvesting ◽  
Rf Energy

This paper investigates the secrecy communication in an underlay cognitive radio (CR) networks with one primary user (PU) as well as multiple PUs, where the radio frequency (RF) energy-harvesting secondary user (SU) transmits the confidential information to the destination in the presence of a potential eavesdropper. We introduce a RF energy-harvesting secondary jammer (SJ) to secure the SU transmissions. The system works in time slots, where each time slot is divided into the energy transfer (ET) phase and the information transfer (IT) phase. In ET phase, the SU and SJ capture energy from the PU transmissions; in the IT phase, the SU uses the harvested energy to transmit information to the destination without causing the harmful interference to the PU transmissions, while the SJ utilizes the captured energy to generate jamming signals to the eavesdropper to secure the SU transmissions. We aim to maximize the secrecy rate for SU transmissionsby jointly optimizing the time allocation between ET phase and IT phase and the transmit power allocation at the SU and SJ. We first formulate the secrecy rate maximization as non-convex optimization problems. Then, we propose efficient nested form algorithms for the non-convex problems. In the outer layer, we obtain the optimal time allocation by the one dimension search method. In the inner layer, we obtain the optimal transmit power allocation by the DC programming, where the Lagrange duality method is employed to solve the convex approximation problem. Simulation results verify that the proposed schemes essentially improve the secrecy rate of the secondary network as compared to the benchmark schemes.

scholarly journals Evaluating the effect of self-interference on the performance of full-duplex two-way relaying communication with energy harvesting

2019 ◽  
Author(s):  
Phong Nguyen- Huu ◽  
Khuong Ho- Van ◽  
Vo Nguyen Quoc Bao
Keyword(s):  
Energy Harvesting ◽  
Closed Form ◽  
Fading Channels ◽  
Relay Node ◽  
Full Duplex ◽  
Closed Form Expression ◽  
Amplify And Forward ◽  
Time Switching ◽  
Half Duplex ◽  
Specific Source

In this paper, we study the throughput and outage probability (OP) of two-way relaying (TWR) communication system with energy harvesting (EH). The system model consists two source nodes and a relay node which operates in full-duplex (FD) mode. The effect of self-interference (SI) due to the FD operation on the system performance is evaluated for both one-way full duplex (OWFD) and two-way full duplex (TWFD) diagrams where the amplify-and-forward (AF) relay node collects energy harvesting with the time switching (TS) scheme. We first propose an individual OP expression for each specific source. Then, we derive the exact closed-form overall OP expression for the OWFD diagram. For the TWFD diagram, we propose an approximate closed-form expression for the overall OP. The overall OP comparison among hybrid systems (Two-Way Half-Duplex (TWHD), OWFD, TWFD) are also discussed.  Finally, the numerical/simulated results are presented for Rayleigh fading channels to demonstrate the correction of the proposed analysis.

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