Wirelessly Energy Harvesting DF Dual-hop Relaying Networks: Optimal Time Splitting Ratio and Performance Analysis

2017 ◽  
Vol 3 (2) ◽  
pp. 16
Author(s):  
Tran Thien Thanh ◽  
Vo Nguyen Quoc Bao
Keyword(s):  
Energy Harvesting ◽  
System Capacity ◽  
Closed Form Expression ◽  
Optimal Time ◽  
High Signal ◽  
Splitting Ratio ◽  
Time Splitting ◽  
Relaying Networks ◽  
And Performance ◽  
Wireless Energy Harvesting

This paper is to derive the optimal time splitting ratio for wireless energy harvesting DF dua-hop relaying networks. Using the partial relay selection, the best relay having the largest harvesting energy is chosen to be the forward for the second hop. We also derive the closed form expression for the optimal time splitting ratio that maximizes the system instantaneous capacity. Numerical results have shown that the system with the optimal time splitting ratio can significantly  improve instantaneous and ergodic system capacity at high signal-to-noise ratios for the same channel and system settings.

scholarly journals Joint Time and Power Allocation Algorithm in NOMA Relaying Network

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Su Zhao ◽  
Chuan Mei ◽  
Qi Zhu
Keyword(s):  
Outage Probability ◽  
Power Allocation ◽  
Relay Network ◽  
Closed Form Expression ◽  
Optimal Time ◽  
High Signal ◽  
Allocation Algorithm ◽  
5G Network ◽  
Cooperative Relay Network ◽  
Outage Probabilities

Nonorthogonal multiple access (NOMA) is one of the promising access techniques in 5G network. The application of relay in NOMA system is a hotspot in recent research. NOMA-based cooperative relay network can achieve a higher spectral efficiency and a lower outage probability. In this paper, we analyse the performance of the two-hop DF relay NOMA network scenario, where the number of cell edge users is more than the cell center user, and obtained the closed-form expression of the user's ergodic rates and outage probabilities under the high signal-to-noise (SNR) ratio. Then, we establish an optimization model to maximize the system rates, and a joint optimal time and power allocation algorithm based on the exhaustive search and the binary algorithm is proposed. Simulation results show that the proposed scheme can outperform exiting scheme in terms of achieving a higher ergodic sum rate, a lower outage probability under the premise of fairness.

scholarly journals Subcarrier Allocation Based Cooperative Spectrum Sharing with Wireless Energy Harvesting in OFDM Relaying Networks

Sensors ◽  
2019 ◽  
Vol 19 (12) ◽  
pp. 2663
Author(s):  
Dan Huang ◽  
Mengshu Hou ◽  
Weidang Lu
Keyword(s):  
Energy Harvesting ◽  
Spectrum Sharing ◽  
Transmission Rate ◽  
Relay Node ◽  
Cognitive System ◽  
Subcarrier Allocation ◽  
Cooperative Spectrum Sharing ◽  
Simulation Results ◽  
Relaying Networks ◽  
Wireless Energy Harvesting

In this paper, we propose subcarrier allocation based cooperative spectrum sharing protocol for OFDM relaying networks with wireless energy harvesting. In the proposed protocol, the cognitive relay node utilizes different subcarriers to forward the primary information to obtain the spectrum access for the cognitive system transmission. The primary system consists of two parts, a primary transmitter (PT) and primary receiver (PR), and cognitive system includes a cognitive source node (CSN), cognitive destination node (CDN) and cognitive relay node (CRN). In the first phase, CRN splits a fraction of the power received from the PT and CSN transmission to decode information, while the remaining power is used for energy harvesting. Then CRN uses disjoint subcarriers to forward the signals of PT and CSN by utilizing the harvested energy in the second phase. Three parameters which consist of power splitting ratio, power allocation and subcarriers allocation are optimized in our algorithm to maximize the cognitive transmission rate with the constraint of primary target transmission rate. Numerical and simulation results are shown to give useful insights into the proposed cooperative spectrum sharing protocol, and we also found that various system parameters have a great effect for the simulation results.

scholarly journals GFDM-Based Cooperative Relaying Networks with Wireless Energy Harvesting

2019 ◽  
Author(s):  
Dick Carrillo Melgarejo ◽  
Jules M. Moualeu ◽  
Pedro Nardelli ◽  
Gustavo Fraidenraich ◽  
Daniel B. da Costa
Keyword(s):  
Energy Harvesting ◽  
Cooperative Relaying ◽  
Relaying Networks ◽  
Wireless Energy Harvesting

scholarly journals Wireless Energy Harvesting Assisted Two-Way Cognitive Relay Networks: Protocol Design and Performance Analysis

IEEE Access ◽  
2017 ◽  
Vol 5 ◽  
pp. 21447-21460 ◽  
Author(s):  
Dang Khoa Nguyen ◽  
Dushantha Nalin K. Jayakody ◽  
Symeon Chatzinotas ◽  
John S. Thompson ◽  
Jun Li
Keyword(s):  
Performance Analysis ◽  
Energy Harvesting ◽  
Relay Networks ◽  
Protocol Design ◽  
Cognitive Relay Networks ◽  
And Performance ◽  
Wireless Energy Harvesting
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