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Wireless Communications and Mobile Computing

Secrecy Performance by Power Splitting in Cooperative Dual‐Hop Relay Wireless Energy Harvesting

Nabila Sehito, Shouyi Yang, Abdullh G. Al Harbi, Muhammad Inam Abbasi, Muhammad Abbas Khan, Muhammad Amir Khan, Mian Muhammad Kamal

Published Jan 1, 2022• 3 citations
Publisher

Abstract

In wireless communication systems, for secure communication between a transmitter and receiver over the communication channel, the physical layer security is widely utilized. The paper presents a dual‐hop wireless full‐duplex relay (FDR) network with a source relay and destination relay between two nodes and listening devices. The relay and source use energy harvesting to gain energy from power beacon. Two cooperative techniques are utilized to investigate the amplify‐forward (AF) and decode‐forward (DF) secrecy capacity in the energy harvesting power splitting system. It is shown that the secrecy performance of an AF relay is better than the secrecy performance of a DF relay in the given form. At 40‐meter distance between the relay and the eavesdropper in an energy harvesting system, the AF relay outperforms the DF relay. The simulation is performed using the Monte‐Carlo method in MATLAB.

DOI
10.1155/2022/8367107

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In this article, we investigated the secrecy performance of a three-hop relay network system with Power Splitting (PS) and Energy Harvesting (EH). In the presence of one eavesdropper, a signal is transferred from source to destination with the help of a relay. The source signal transmits in full-duplex (FD) mood, jamming the relay transfer signals to the destination. The relay and source employ Time Switching (TS) and Energy Harvesting (EH) techniques to obtain the power from the power beacon. In this study, we compared the Secrecy Rate of two Cooperative Schemes, Amplify and Forward (AF) and Decode and Forward (DF), for both designed systems with the established EH and PS system. The Secrecy Rate was improved by 50.5% in the AF scheme and by 44.2% in the DF scheme between the relay and eavesdropper at 40 m apart for the proposed system in EH and PS. This simulation was performed using the Monto Carlo method in MATLAB.
This paper investigates the secrecy performance of a single hop wireless relay network employing power splitting (PS) energy harvesting (EH) technique, using the term secrecy rate. In this network, a relay is present between source and destination to forward signal to the destination and a power beacon provides power to relay and source using EH technique to perform their respective roles. The secrecy rate of this system is analyzed for two cooperative schemes i.e. decode-and-forward (DF) and amplify-and-forward (AF).
This paper investigates the secrecy performance of single hop relaying network with Energy Harvesting (EH) and also shows that the system with EH outperforms the conventional system in terms of secrecy rate and energy efficiency. In the proposed system, the source transmits the information signal to the destination via a relay in the presence of an eavesdropper and the source and relay utilizes time switching EH technique to obtain power from a power beacon. This paper compares the secrecy rate of two cooperative schemes: decode-and-forward (DF), and amplify-and-forward (AF) for both proposed system with EH and the conventional system. The system with EH provides higher secrecy rate than that of the conventional system by 30.47 % for DF cooperative scheme and by 23.63 % for AF relay at a distance of 40 m between the eavesdropper and the relay. The resulting analysis also shows that the secrecy rate of the AF relay is higher than that of the DF relay in both considered system with EH and conventional system.
In this study, the authors propose a cooperative transmission scheme with energy‐harvesting (EH) relays under wiretapping of an eavesdropper. In this scheme, the relays harvest energy from radio‐frequency (RF) signals of a source through power‐splitting receivers, and process arrived signals by amplify‐and‐forward (EH‐AF protocol) and decode‐and‐forward (EH‐DF protocol) technologies. In the proposed protocols, a best relay is selected at the destination so that the end‐to‐end achievable secrecy rates are maximal. Exact and asymptotic secrecy outage probability expressions are used to evaluate the EH‐AF and EH‐DF protocols, respectively, and are confirmed by Monte Carlo simulations. The simulation results show that (i) the EH‐DF protocol outperforms the EH‐AF protocol, and both proposed protocols are improved when the number of cooperative relays and the distances of the relay–eavesdropper links increase and the relays move toward the destination, (ii) the secrecy performance of the EH‐AF and EH‐DF protocols is the best at optimal power‐splitting ratios, which are obtained by the golden section search method, (iii) the energy conversion efficiency and the noise at RF‐to‐baseband conversion units seriously affect the proposed protocols, and finally, (iv) the theoretical analysis results fit those of the Monte Carlo simulations.
In wireless communication, physical layer security is widely used for secure communication between the transmitter and the receiver. In this paper, the secrecy performance of two cooperative schemes, decode-and-forward (DF) and amplify-and-forward (AF) relays is investigated in a single hop wireless relaying system. The achievable secrecy rate is investigated with these two types of relays under the constraint of total power transmitted. In the given jamming relay network, the relay transmits jamming signal while receiving data signal from the source. It is indicated by the resulting analysis that the AF relays have better secrecy rate as compared to the DF relays in the given condition. The secrecy rate of the AF relay is higher than that of the DF relay by 71.88% at a distance of 70 m between the relay and the eavesdropper in this jamming relay network.
The secrecy capacity (SC) from the source to a destination in a dual-hop amplify-and-forward (AF) relay network using cooperative jamming (CJ) is investigated. Conditions for achieving a positive SC are derived. An energy constrained untrusted cooperative relaying protocol is considered in which the relay forwards information from the source to the destination while harvesting energy from the source signal and the destination jamming signal. An optimization problem is proposed to maximize the SC subject to the energy constraints. A method is proposed to find the optimal power split ratio (PSR) which maximizes the SC. An approximate expression for the optimal PSR is also derived. Results show that a mutually beneficial relationship exists between source-destination pair and the relay. This allows the relay to achieve a net energy gain while the secrecy of the confidential message from the source to the destination is protected.