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CRC Press eBooks

Physical Layer Security in Two-Way Wireless Communication System

Shashibhushan Sharma, Sanjay Dhar Roy, Sumit Kundu

Published Dec 18, 2020• 0 citations
Publisher

Abstract

We present secrecy performance of a two-way communication (TWC) with a number of amplify and forward (AF) relays in a cognitive radio network (CRN) as well as TWC with the help of DF relays. A TWC with multiple untrusted half-duplex AF relays is set up in an underlay CRN where two sources are not directly connected due to shadowing and path loss. In this cognitive network, two sources share their information to each other over two phases via an intermediate relay selected among multiple AF relays. A power-splitting scheme based energy harvesting from radio frequency signal is considered at the relay. Further, the AF relays are untrusted and eavesdrops the message also. Due to the CRN, the transmit power of the transmitting nodes are controlled under the cognitive constraints such as outage probability threshold of the primary network. Further, the TWC is analyzed with DF relays where an external eavesdropper eavesdrops the message from both the sources but not simultaneously. We have evaluated the physical layer security (PLS) through a metric known as secrecy outage probability (SOP). We have derived SOP in closed-form expression and presented in for both the scenarios of investigations. The analytical results, based on the closed-form expression, are justified by the MATLAB-based simulation results. We observe that PLS increases with an increase in the number of relays, primary network transmit power, and transmit power of the cognitive device. In TWC with DF relays, an optimal value of transmit power of a source and fraction of supply power to the relay are obtained at which secrecy performance is maximized.

DOI
10.1201/9781003003472-13

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We present secrecy performance of a two-way communication (TWC) with a number of amplify and forward (AF) relays in a cognitive radio network (CRN) as well as TWC with the help of DF relays. A TWC with multiple untrusted half-duplex AF relays is set up in an underlay CRN where two sources are not directly connected due to shadowing and path loss. In this cognitive network, two sources share their information to each other over two phases via an intermediate relay selected among multiple AF relays. A power-splitting scheme based energy harvesting from radio frequency signal is considered at the relay. Further, the AF relays are untrusted and eavesdrops the message also. Due to the CRN, the transmit power of the transmitting nodes are controlled under the cognitive constraints such as outage probability threshold of the primary network. Further, the TWC is analyzed with DF relays where an external eavesdropper eavesdrops the message from both the sources but not simultaneously. We have evaluated the physical layer security (PLS) through a metric known as secrecy outage probability (SOP). We have derived SOP in closed-form expression and presented in for both the scenarios of investigations. The analytical results, based on the closed-form expression, are justified by the MATLAB-based simulation results. We observe that PLS increases with an increase in the number of relays, primary network transmit power, and transmit power of the cognitive device. In TWC with DF relays, an optimal value of transmit power of a source and fraction of supply power to the relay are obtained at which secrecy performance is maximized.
We evaluate secrecy outage probability (SOP) of a two-way communication network that uses a half-duplex amplify and forward (AF) relay in a cognitive radio network, where the relay uses two directional antennas. The transmitted signal from the cognitive sources only is eavesdropped by an eavesdropper (EAV) which however fails to eavesdrop relayed signal due to use of directional antennas. A signal from one cognitive source (CS1) acts as a jamming signal for the other at the EAV. A closed form expression for SOP, in the jamming nature of the signals of the cognitive sources, has been developed and impact of several network parameters such as primary transmit power, channel mean power, relay transmit power, and threshold secrecy rate on SOP has been evaluated. Further, MATLAB Simulation has been carried out to validate the analytical results.
In this paper, the physical layer security in cognitive radio networks (CRNs) is investigated. We consider an underlay relay assisted CRN consisting of multiple secondary sources, multiple-antenna destination, a single relay, and multiple eavesdroppers. The destination node performs the maximal-ratio combining under uncorrelated Rayleigh fading channels. In more details, we consider, a secondary source is randomly selected to transmit its data, and a jammer is chosen from the remaining source nodes to send a jamming signal to the eavesdroppers. The closed-form expression of the secrecy outage probability is derived, based on the statistical characteristics of the communication channels, under the primary user's quality of service constraint. The derived analysis gives deep insights into the impact of network parameters on the performance of on the secrecy outage performance. Analytic results are corroborated through Monte Carlo simulation.
In this paper, the authors evaluate the secrecy performance of a two‐way communication network via two half‐duplex decode and forward relays under an eavesdropper attacking. The sources (S1 and S2) communicate with each other via the relays in two phases. Due to the directional antennas at the relay, eavesdropper does not eavesdrop from the relay. The eavesdropper only eavesdrops the message from one of two sources at a time, which has higher strength. The total relay power is divided between two relays. An optimal value of power allocation, which minimises the secrecy outage probability (SOP), is derived under equal and different transmit power of both the sources. The optimal value of transmitting power of S1 is obtained for a fixed value of transmitting power of S2. Performance in terms of the SOP increases with increase in transmit power of the sources, supply power for relays while it may decrease with increase in transmit power of one source beyond its optimal value for a given transmit power of the other source and increase in the threshold of global secrecy rate. They derive a closed‐form expression of SOP of this proposed model. The analytical results are validated by our MATLAB based simulation results
In this paper, the physical layer security of full-duplex two-way multiple amplify-and-forward (AF) relaying network in the presence of an eavesdropper is analyzed. The closed-form expression of the approximate secrecy outage probability (SOP) based on the optimal relay selection scheme (ORS) in maximizing the secrecy capacity of proposed network is given out. Furthermore, Monte-Carlo simulation results validate the analytical expressions and show that secrecy performance can be impacted by different parameters, including the number of candidate relay and the average power of residual self-interference. The simulation results also show that the full-duplex relaying systems based on optimal relay selection scheme can significantly outperform the conventional single-relay systems and the traditional half-duplex scheme in secrecy performance.
In recent years, physical layer security has been considered as an effective method to enhance the information security beside the cryptographic techniques that are used in upper layers. In this paper, we provide the security analysis for a two-way relay network, where the two sources can only communicate through the intermediate relay nodes. In particular, we consider the scenario that there is an eavesdropper in the vicinity of one source node. Both reliability and security aspects are taken into consideration in our work. To enhance the reliability of communication, the intermediate relays are supplied with the energy harvested from the sources' radio frequency (RF) signals using hybrid time-switching and power splitting (TPSR) protocol. Also, we apply the relay selection technique to select the best relay for the information exchange between two sources. Regarding security, the secrecy of information is improved with the help of friendly jammers nearby the eavesdropper. We provide the in-dept reliability and security analysis in terms of the closed-form expressions of the outage probability (OP) at the source nodes, the intercept probability (IP) at the eavesdropper, the secrecy outage probability (SOP), and the average secrecy capacity (ASC) of the system. Finally, the Monte Carlo simulations are also conducted to verify the correctness of our analysis and the effectiveness of the proposed scheme. Numerical results confirms that with the appropriate and feasible choices of involved parameters, both outage OP and IP can be kept at small values to guarantee the reliable and secure communication of the system.
In this study, the physical layer security for cognitive radio network (CRN) will be investigated in which a secondary user transmitter (SU-Tx) sends confidential information to a SU receiver (SU-Rx) on the same frequency band of a primary user (PU) in the presence of an eavesdropper receiver. Moreover, relay selection scheme is proposed for the security constrained CRNs with single eavesdropper, multiple eavesdroppers and PUs. The proposed scheme selects a trusted decode and forward relay to assist the SU-Tx and maximise the achievable secrecy rate that is subjected to the interference power constraints at the PUs for the different number of eavesdroppers and PUs under available channel knowledge. The SU cooperates with relays only when a high secrecy rate is achieved. Secrecy rate and secrecy outage probability are the two performance metrics that are used to verify the effectiveness of the proposed scheme although asymptotic approximations of the secrecy outage probability are also derived. Simulation and analytical results demonstrate that the performance improvement of the proposed scheme reaches to the double relative to the conventional scheme for the secrecy capacity.