scholarly journals Joint relay and jammer selection in Internet of Things systems

2017 ◽  
Vol 13 (1) ◽  
pp. 155014771668776
Author(s):  
Zhen Li ◽  
Tao Jing ◽  
Yan Huo
Keyword(s):  
Internet Of Things ◽  
Physical Layer Security ◽  
Relay Selection ◽  
Relay Node ◽  
Low Complexity ◽  
Optimal Stopping Problem ◽  
Security Issue ◽  
Selection Scheme ◽  
Programming Solution ◽  
Dynamic Programming Solution

In this article, we consider the physical layer security issue in Internet of Things systems, in which there exist a sensing transceiver pair, a number of candidate nodes, and an eavesdropper. The transceiver pair needs to select a jammer node and a relay node among the candidate nodes so as to preserve the secrecy of the communications. Considering the diversity of candidate channels and the limited available power, it is infeasible to scan all the nodes and find the optimal one. We formulate this jammer and relay selection problem as an optimal stopping problem under a fixed sensing order. Then, through applying dynamic programming solution, we propose a low-complexity approach to obtain the optimal sensing order. The performance of the proposed selection scheme is evaluated through numerical results.

scholarly journals Power Optimized Single Relay Selection with an Improved Link-Adaptive-Regenerative Protocol

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Jie Li ◽  
Jianrong Bao ◽  
Shenji Luan ◽  
Bin Jiang ◽  
Chao Liu
Keyword(s):  
Outage Probability ◽  
Cooperative Communications ◽  
Power Efficiency ◽  
Relay Selection ◽  
Relay Node ◽  
Link Quality ◽  
Selection Strategy ◽  
Amplify And Forward ◽  
Selection Scheme ◽  
Single Relay

To improve the reliability and efficiency in cooperative communications, a power optimized single relay selection scheme is proposed by increasing the diversity effort with an improved link-adaptive-regenerative (ILAR) protocol. The protocol determines the forwarding power of a relay node by comparing the signal-to-noise ratio (SNR) at both sides of the node; thus it improves the power efficiency. Moreover, it also proposes a single relay selection strategy to maximize the instantaneous SNR product, which ensures the approximate best channel link quality for good relay forwarding. And the system adjusts the forwarding power in real time and also selects the best relay node participated in the cooperative forwarding. In addition, the cooperation in the protocol is analyzed and the approximate expression of the bit-error-rate (BER) and the outage probability at high SNRs are also derived. Simulation results indicate that the BER and outage probability of the relay selection scheme by the ILAR protocol outperform other contrast schemes of current existing protocols. At BER of 10−2, the proposed scheme with ILAR protocol outperforms those of the decoded-and-forward (DF), the selected DF (SDF), and the amplify-and-forward (AF) protocols by 3.5, 3.5 and 7 dB, respectively. Moreover, the outage probability of the relay system decreases with the growth of the relay number. Therefore, the proposed relay selection scheme with ILAR strategies can be properly used in cooperative communications for good reliability and high power efficiency.

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 Battery-Friendly Relay Selection Scheme for Prolonging the Lifetimes of Sensor Nodes in the Internet of Things

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 33180-33201 ◽  
Author(s):  
Jin Li ◽  
Wei Liu ◽  
Tian Wang ◽  
Houbing Song ◽  
Xiong Li ◽  
...  
Keyword(s):  
Internet Of Things ◽  
Relay Selection ◽  
Sensor Nodes ◽  
The Internet ◽  
Selection Scheme ◽  
The Internet Of Things

scholarly journals Adaptive Relay Selection Scheme Based on Bayesian Inference (AS-BI) for Cooperative Communication in 5G Networks

TEM Journal ◽  
2021 ◽  
pp. 839-846
Author(s):  
Madeeha Ishtiaq ◽  
Shakeel A. Waqas ◽  
Muhammad Saifullah ◽  
Nazih K. Mallat
Keyword(s):  
Bayesian Inference ◽  
Relay Selection ◽  
Network Performance ◽  
Optimal Solution ◽  
Relay Node ◽  
Cooperative Networks ◽  
5G Networks ◽  
Amplify And Forward ◽  
Selection Scheme ◽  
Adaptive Selection

In this paper, a Bayesian inference-based relay selection scheme, also called Adaptive Selection on Bayesian Inference (AS-BI) for cooperative networks in 5G networks is invoked. This scheme works on the principle of Amplify-and-Forward (AF) protocol which selects the most optimal relay towards the destination. This paper proposed a probabilitybased relay selection scheme in which posterior probability is calculated for the selection of relay node based on the prior and conditional probabilities. The proposed scheme has been accepted as optimal solution for relay selection, which significantly enhances the network performance by reducing (BER) for constant SNR.

Proposed relay selection scheme for physical layer security in cognitive radio networks

2012 ◽  
Vol 6 (16) ◽  
pp. 2676-2687 ◽  
Author(s):  
H. Sakran ◽  
O. Nasr ◽  
S. El-Rabaie ◽  
A.A. El-Azm ◽  
M. Shokair
Keyword(s):  
Cognitive Radio ◽  
Cognitive Radio Networks ◽  
Physical Layer Security ◽  
Relay Selection ◽  
Physical Layer ◽  
Radio Networks ◽  
Selection Scheme
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