scholarly journals JOINT BEAMFORMING AND POWER SPLITTING DESIGN FOR TWO WAY AF RELAY NETWORKS WITH ENERGY HARVESTING

2020 ◽  
Vol 90 ◽  
pp. 37-43
Author(s):  
Jun Shao ◽  
Jinxin Zhu
Keyword(s):  
Energy Harvesting ◽  
Relay Networks ◽  
Power Splitting ◽  
Af Relay

scholarly journals Dynamic Power Splitting Strategy for SWIPT Based Two-Way Multiplicative AF Relay Networks with Nonlinear Energy Harvesting Model

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Tianci Wang ◽  
Guangyue Lu ◽  
Yinghui Ye ◽  
Yuan Ren
Keyword(s):  
Energy Harvesting ◽  
Iterative Method ◽  
Relay Network ◽  
Power Splitting ◽  
Amplify And Forward ◽  
Channel State ◽  
Dynamic Power ◽  
Energy Constrained ◽  
Af Relay ◽  
Nonlinear Energy

This paper investigates an energy-constrained two-way multiplicative amplify-and-forward (AF) relay network, where a practical nonlinear energy harvesting (NLEH) model is equipped at the relay to realize simultaneous wireless information and power transfer (SWIPT). We focus on the design of dynamic power splitting (DPS) strategy, in which the PS ratio is able to adjust itself according to the instantaneous channel state information (CSI). Specifically, we first formulate an optimization problem to maximize the outage throughput, subject to the NLEH. Since this formulated problem is nonconvex and difficult to solve, we further transfer it into an equivalent problem and develop a Dinkelbach iterative method to obtain the corresponding solution. Numerical results are given to verify the quick convergence of the proposed iterative method and show the superior outage throughput of the designed DPS strategy by comparing with two peer strategies designed for the linear energy harvesting (LEH) model.

scholarly journals Energy Efficiency Analysis in Modified GoF Spectrum Sensing-Based AF Relay Cooperative Cognitive Sensor Network with Energy Harvesting

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Yin Mi ◽  
Guangyue Lu ◽  
Wenbin Gao
Keyword(s):  
Energy Efficiency ◽  
Energy Harvesting ◽  
Sensor Network ◽  
Spectrum Sensing ◽  
Closed Form Expression ◽  
Initial Time ◽  
Maximization Problem ◽  
Power Splitting ◽  
Transmission Power ◽  
Af Relay

In this paper, we propose a joint sensing duration and transmission power allocation scheme to maximize the energy efficiency (EE) of the secondary user (SU) in a cooperative cognitive sensor network (CSN). At the initial time slot of the frame, the secondary transmitter (ST) performs energy harvesting (EH) and spectrum sensing simultaneously using power splitting (PS) protocol. The modified goodness of fit (GoF) spectrum sensing algorithm is employed to detect the licensed spectrum, which is not sensitive to an inaccurate noise power estimate. Based on the imperfect sensing results, the ST will act as an amplify-and-forward (AF) relay and assist in transmission of the primary user (PU) or transmit its own data. The SU’s EE maximization problem is constructed under the constraints of meeting energy causality, sensing reliability, and PU’s quality of service (QoS) requirement. Since the SU’s EE function is a nonconvex problem and difficult to solve, we transform the original problem into a tractable convex one with the aid of Dinkelbach’s method and convex optimization technique by applying a nonlinear fractional programming. The closed-form expression of the ST’s transmission power is also derived through Karush-Kuhn-Tucker (KKT) and gradient method. Simulation results show that our scheme is superior to the existing schemes.

scholarly journals Robust AN-Aided Secure Beamforming and Power Splitting in Wireless-Powered AF Relay Networks

2018 ◽  
pp. 1-4 ◽  
Author(s):  
Hehao Niu ◽  
Bangning Zhang ◽  
Kai-Kit Wong ◽  
Zheng Chu ◽  
Fuhui Zhou
Keyword(s):  
Relay Networks ◽  
Power Splitting ◽  
Af Relay

scholarly journals Security–reliability tradeoff analysis of untrusted energy harvesting relay networks

2018 ◽  
Vol 14 (1) ◽  
pp. 155014771875472 ◽  
Author(s):  
Dechuan Chen ◽  
Weiwei Yang ◽  
Jianwei Hu ◽  
Weifeng Mou ◽  
Yueming Cai
Keyword(s):  
Energy Harvesting ◽  
Outage Probability ◽  
Relay Networks ◽  
Secrecy Outage Probability ◽  
Power Splitting ◽  
Amplify And Forward ◽  
Time Switching ◽  
Radio Frequency Signals ◽  
Secrecy Outage ◽  
Analytical Expressions

We investigate secure communications in untrusted energy harvesting relay networks, where the amplify-and-forward relay is an energy constrained node powered by the received radio frequency signals, and try to unauthorizedly decode the confidential information from the source. The secrecy outage probability and connection outage probability are respectively derived in closed-form to evaluate the security and reliability for three energy harvesting strategies, for example, time switching relaying strategy, power splitting relaying strategy, and ideal relaying receiver strategy. Subsequently, the effective secrecy throughput is conducted to characterize the overall efficiency, and the asymptotic analysis of the secrecy throughput is given to determine the optimal energy harvesting strategies in different operating regimes. Furthermore, in order to achieve the optimal effective secrecy throughput performance, a switching threshold between time switching relaying and power splitting relaying is designed. Numerical results verify the accuracy of the analytical expressions and reveal that the effective secrecy throughput of the system can be effectively promoted by the threshold switching energy harvesting strategy.

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