scholarly journals Performance analysis of the clustering-based multihop wireless energy harvesting sensor networks over symmetric and asymmetric fading channels

2017 ◽  
Vol 13 (2) ◽  
pp. 155014771769384 ◽  
Author(s):  
Vikash Singh ◽  
Hideki Ochiai
Keyword(s):  
Energy Harvesting ◽  
Fading Channels ◽  
Relay Selection ◽  
Transmission Rate ◽  
Rician Fading ◽  
Power Splitting ◽  
Decode And Forward ◽  
Selection Scheme ◽  
Multihop Relaying ◽  
Partial Relay Selection

In this work, we propose a clustering-based multihop relaying with the partial relay selection scheme for an energy harvesting relaying network and analyze the performance in the framework of the decode-and-forward relaying and adaptive power splitting protocol over symmetric and asymmetric fading channel models. In particular, we analyze the system performance in terms of the outage probability, effective transmission rate, and throughput. Through extensive numerical analysis, we show that the proposed scheme can substantially outperform the conventional multihop relaying without clustering as well as direct transmission, which suggests that the proposed scheme can be used to extend the network coverage without any extra energy from the network. We also demonstrate that the proposed scheme can compensate for the performance loss due to poor radio frequency to DC conversion efficiency as well as path loss by exploiting the gain associated with multihop relaying as well as the diversity gain achieved through the partial relay selection scheme. Moreover, we investigate the relationship between the total number of relay nodes in the network and the number of hops and show that there is an optimal number of hops that can maximize the throughput for a given transmission power of the source. The effect of the asymmetric channels in our clustering-based multihop relaying is also investigated and it is revealed that the existence of Rician fading will help improve the throughput at the destination side, rather than the source side, as opposed to the conventional multihop relaying scenarios without clustering.

scholarly journals Partial Relay Selection for Secure Cooperative NOMA Networks

2021 ◽  
Author(s):  
Wided Hadj Alouane
Keyword(s):  
Fading Channels ◽  
Relay Selection ◽  
Signal To Noise Ratio ◽  
Secrecy Outage Probability ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
Partial Relay Selection ◽  
Asymptotic Expressions ◽  
Selection For ◽  
Secrecy Outage

Abstract In this paper, we investigate physical layer security of multi-relay non-orthogonal multiple access (NOMA) networks with partial relay selection considering decode-and-forward (DF) and amplify-and-forward (AF) protocols. We propose a partial relay scheme aiming to select the best relay based on the highest signal-to-noise-ratio (SNR) of the first link. We derive new exact and asymptotic expressions for strictly positive secrecy capacity (SPSC) and secrecy outage probability (SOP) considering Rayleigh fading channels. Numerical results demonstrate that AF and DF provide almost a similar secrecy performance. Moreover, they prove that partial relay selection improves SPSC and reduces SOP when the relay-cluster is closer to the legitimate receiver.

Performance analysis of decode-and-forward partial relay selection in NOMA systems with RF energy harvesting

2018 ◽  
Vol 25 (8) ◽  
pp. 4585-4595 ◽  
Author(s):  
Tran Manh Hoang ◽  
Nguyen Trung Tan ◽  
Nguyen Huy Hoang ◽  
Pham Thanh Hiep
Keyword(s):  
Performance Analysis ◽  
Energy Harvesting ◽  
Relay Selection ◽  
Decode And Forward ◽  
Rf Energy Harvesting ◽  
Partial Relay Selection ◽  
Rf Energy

scholarly journals Joint Optimal Power Allocation and Relay Selection Scheme in Energy Harvesting Two-Way Relaying Network

2019 ◽  
Vol 11 (2) ◽  
pp. 47 ◽  
Author(s):  
Xin Song ◽  
Siyang Xu ◽  
Zhigang Xie ◽  
Xiuwei Han
Keyword(s):  
Energy Harvesting ◽  
Power Allocation ◽  
Relay Selection ◽  
Closed Form Solution ◽  
Relay Node ◽  
Information Rate ◽  
Power Splitting ◽  
Joint Power ◽  
Selection Scheme ◽  
Joint Resource Allocation

In this paper, we propose a joint power allocation, time switching (TS) factor and relay selection scheme for an energy harvesting two-way relaying communication network (TWRN), where two transceivers exchange information with the help of a wireless-powered relay. By exploiting the TS architecture at the relay node, the relay node needs to use additional time slots for energy transmission, reducing the transmission rate. Thus, we propose a joint resource allocation algorithm to maximize the max-min bidirectional instantaneous information rate. To solve the original non-convex optimization problem, the objective function is decomposed into three sub-problems and solved sequentially. The closed-form solution of the transmit power of two sources and the optimal TS factor can be obtained by the information rate balancing technology and the proposed time allocation scheme, respectively. At last, the optimal relay node can be obtained. Simulation results show that the performance of the proposed algorithm is better than the traditional schemes and power-splitting (PS) scheme.

scholarly journals Power Splitting and Source-Relay Selection in Energy Harvesting Wireless Network

2021 ◽  
Author(s):  
xiao jiang ◽  
Peng Li ◽  
ruchuan wang
Keyword(s):  
Energy Harvesting ◽  
Outage Probability ◽  
Relay Selection ◽  
Relay Network ◽  
Power Splitting ◽  
Multiple Sources ◽  
Decode And Forward ◽  
Optimal Power ◽  
Splitting Ratio ◽  
Better Than

Abstract In this paper, we consider an energy-harvesting (EH) relay network composing of multiple sources, a destination and multiple EH decode-and-forward (DF) relays. The EH relays all equip with a power splitter to divide the received signal power into two parts, one for information decoding and the remaining for signal relaying. The power splitting ratio (PSR) depicts the trade-off between the relaying energy and decoding energy. We propose an optimal power splitting and joint source-relay selection (OPS-JSRS) scheme where the optimal power-splitting ratio is obtained and the best source-relay pair is selected to transmit the message. For the purpose of comparison, we examine the optimal power splitting and round-robin (OPS-RR) scheme and the traditional power splitting and joint source-relay selection (TPS-JSRS) scheme. The exact and asymptotic closed-form expressions of outage probability for OPS-RR, TPS-JSRS and OPS-JSRS schemes are derived. Numerical results show that OPS-JSRS scheme is better than OPS-RR and TPS-JSRS schemes in terms of outage probability, explaining the superiority of the proposed OPS-JSRS scheme. Additionally, outage probability performance of OPS-JSRS scheme can be improved by increasing the number of sources and relays.

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