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International Conference on Emerging Trends in Communication Technologies (ETCT)

Physical layer security in half-duplex multi-hop relaying system

Rupali Nirala, Sudakar Singh Chauhan

Published Nov 1, 2016• 1 citation
Publisher

Abstract

In this paper we represent a half-duplex relay network to investigate the secrecy performance of multi-hop relaying system. In this paper half duplex relay(HDR) is used to enhance the physical layer security (PLS) for secure transmission in multi-hop relaying system, in which each intermediate node help to forward the message as a relay. In this paper, we find out the secrecy performance of half-duplex jamming (HDJ) network and this network is design in such a way that each HDR transmit jamming signal to the intruder when it receive the required signal from the previous adjacent node. In this paper we also investigated the achievable secrecy rate in HDR and HDJ network under the total transmit power constraint with the decode-and-forward scheme. Numerical results show that the HDJ network has better secrecy rate than HDR network.

DOI
10.1109/etct.2016.7882988

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In this paper we represent a half-duplex relay network to investigate the secrecy performance of multi-hop relaying system. In this paper half duplex relay(HDR) is used to enhance the physical layer security (PLS) for secure transmission in multi-hop relaying system, in which each intermediate node help to forward the message as a relay. In this paper, we find out the secrecy performance of half-duplex jamming (HDJ) network and this network is design in such a way that each HDR transmit jamming signal to the intruder when it receive the required signal from the previous adjacent node. In this paper we also investigated the achievable secrecy rate in HDR and HDJ network under the total transmit power constraint with the decode-and-forward scheme. Numerical results show that the HDJ network has better secrecy rate than HDR network.
In this letter, we consider secure communications in multi-hop relaying systems, where full-duplex relays (FDRs) operate to enhance wireless physical layer security. Each FDR is designed to transmit jamming signals to the eavesdropper when it receives information signals from the previous adjacent node. The achievable secrecy rate with the proposed decode-and-forward (DF) FDRs are analyzed with a total transmit power constraint. The transmit power allocation problem is solved by using the geometric programming (GP) method. Numerical results present that the proposed FDRs significantly enhance the secrecy rate compared to the conventional half-duplex relays (HDRs).
Secure transmission is possible in wireless communication due to physical layer security with the help of relay in the presence of eavesdroppers. In this system, we investigate the secrecy performance for desired users where undesired users, who are not selected for data reception, may overhear the message signal as eavesdroppers. Here, relay operate with decode-and-forward (DF) mode with full-duplex jamming (FDJ) under total transmit power constraint. First obtain the secrecy rate for half-duplex transmission (HDT), which requires two time slot for data reception and transmission. Second obtain the secrecy rate in FDJ. In this system, we use FDJ scheme to overcome the overhearing of eavesdroppers, in which a desired receiver send a jamming signal towards untrustworthy relay when relay receive a message signal from transmitter and then relay decode and forward the received signal towards desired receiver on the same time slot. Now receiver receives the message signal with jamming and only this desire receiver can subtract the jamming signal and also it will create an interference to prevent the overhearing of undesired receiver. The result indicate that secrecy rate of FDJ is better than the HDT.
The open broadcast nature of the wireless networks makes it vulnerable to the eavesdropper attacks. The physical layer security (PLS) is a grown research field that exploits the characteristics of the physical wireless channel to prevent the eavesdropper interruptions and attacks. The use of the cooperative relay transmission is a method to approach the physical layer security. This paper studies the secrecy performance metrics of the half-duplex two-way multi-relaying technique. A cooperative jamming protocol is proposed to enhance the physical layer security, where the destination sends jamming signals to the eavesdropper node to degrade its channel capacity. However, the relays can act as a jammer and send jamming signals to the eavesdropper node. Moreover, Simulations of the performance metrics namely the secrecy capacity (Cs) and the secrecy outage probability (SOP) applied on the technique are presented and discussed to measure the secrecy level of the proposed technique compared with an existing technique namely half-duplex one-way multi-relaying technique. Based on simulations and discussions the proposed technique outperforms the existing technique in term of secrecy performance.
This paper investigates the secrecy performance of full-duplex relay (FDR) networks. The resulting analysis shows that FDR networks have better secrecy performance than half duplex relay networks, if the self-interference can be well suppressed. We also propose a full duplex jamming relay network, in which the relay node transmits jamming signals while receiving the data from the source. While the full duplex jamming scheme has the same data rate as the half duplex scheme, the secrecy performance can be significantly improved, making it an attractive scheme when the network secrecy is a primary concern. A mathematic model is developed to analyze secrecy outage probabilities for the half duplex, the full duplex and full duplex jamming schemes, and the simulation results are also presented to verify the analysis.
In this paper, we consider secure transmission for the full duplex relay network. Aiming to improve the physical layer security, we propose a full duplex hybrid relaying-and-jamming (FDHRJ) scheme. In the FDHRJ scheme, we design a pre-coding matrix to form a jamming signal and let the relay simultaneously transmit both the desired signal and the jamming signal every slot. The destination can decode the desired signal and eliminate the jamming signal while the eavesdropper cannot do this. Based on the scheme, we derive an analytical expression of the system secrecy rate and the optimal power allocation between the desired signal and the jamming signal. The simulation results show that the proposed FDHRJ scheme with the optimal power allocation has better performance than the exiting schemes.
In this letter, we consider a non-orthogonal multiple access (NOMA) network with a half-duplex (HD) decode-and-forward (DF) relay to improve physical layer security (PLS) of two users. Two legitimate users of U1 and U2 are far from the multi-antenna base station (BS). Thus, a relay with multi-antenna is used to enhance communication and obtain diversity gain. In the first stage, the BS transmits the superimposed signal to the relay via NOMA. Meanwhile, U1 generates the jamming signal to the eavesdropper (Eve). In the second stage, the relay forwards the signal to two users while the BS transmits the jamming signal to disrupt the eavesdropping. It is assumed that the Eve has strong eavesdropping ability. Thus, we need to introduce jamming to guarantee security. Furthermore, we use U1 instead of a full-duplex (FD) relay to send the jamming signal in the first stage to avoid self-interference. To measure the secrecy performance, a closed-form expression of secrecy outage probability (SOP) is derived for the two users. Simulation results are provided to verify the correctness of the proposed scheme.