Secure Two-Way Transmission via Wireless-Powered Untrusted Relay and External Jammer

Abstract

In this paper, we propose a two-way secure communication scheme where two transceivers exchange confidential messages via a wireless powered untrusted amplify-and-forward (AF) relay in the presence of an external jammer. We take into account both friendly jamming (FJ) and Gaussian noise jamming (GNJ) scenarios. Based on the time switching (TS) architecture at the relay, the data transmission is done in three phases. In the first phase, both the energy-starved nodes, the untrustworthy relay and the jammer, are charged by non-information radio frequency (RF) signals from the sources. In the second phase, the two sources send their information signals and concurrently, the jammer transmits artificial noise to confuse the curious relay. Finally, the third phase is dedicated to forward a scaled version of the received signal from the relay to the sources. For the proposed secure transmission schemes, we derive new closed-form lower-bound expressions for the ergodic secrecy sum rate (ESSR) in the high signal-to-noise ratio (SNR) regime. We further analyze the asymptotic ESSR to determine the key parameters; the high SNR slope and the high SNR power offset of the jamming based scenarios. To highlight the performance advantage of the proposed FJ, we also examine the scenario of without jamming (WoJ). Finally, numerical examples and discussions are provided to acquire some engineering insights, and to demonstrate the impacts of different system parameters on the secrecy performance of the considered communication scenarios. The numerical results illustrate that the proposed FJ significantly outperforms the traditional one-way communication and the Constellation rotation approach, as well as our proposed benchmarks, the two-way WoJ and GNJ scenarios.

On the Performance of Low-Altitude UAV-Enabled Secure AF Relaying With Cooperative Jamming and SWIPT

“…In order to obtain a closed-form lower-bound expression for E{C S }, one can write, following the Jensen's inequality, as [31] (see (D.1)). In (D.1), the term E{ln(γ A →B )} is further calculated as…”

Physical‐layer security for cellular multiuser two‐way relaying networks with single and multiple decode‐and‐forward relays

“…The secrecy performance of TWR relay networks has been widely investigated. [23][24][25][26][27] In particular, Long et al 23 have investigated the secrecy performance of an amplify-and-forward (AF)-based TWR network under an eavesdropping attack. A wireless-powered TWR model for secure communication in the presence of multiple eavesdroppers has been investigated by Lee et-al.…”

“…24 Zhang et-al 25 have investigated physical-layer security for two-way untrusted relaying with friendly jammers. The secrecy performance of secure TWR networks with a wireless-powered AF untrusted relay under the friendly jamming and Gaussian noise jamming scenarios has been studied by Mamaghani et al 26 Moreover, Fu et al 27 have evaluated the symbol error rate and optimal power allocation for secure decode-and-forward (DF)-based TWR networks. To further improve the secrecy performance of TWR systems, various multirelay and/or multiantenna scenarios, and various opportunistic transmission schemes were investigated in the literature.…”

A Stackelberg game for relay selection and power allocation in an active cooperative model involving primary users and secondary users

“…1,6,[9][10][11][18][19][20][24][25][26][27] Two-way relaying is another type of cooperation, which was investigated in recent works. 28,29 Authors in a previous work 28 studied the problem of transmit power allocation for a network of two terminals with multiantenna and a twoway relay, amplify-and-forward relays and presented two different solutions. The first one involved maximizing the sum rate to a total power constraint, while the second was maximizing the sum rate when one of the terminals must exceed a target signal to interference plus noise ratio (SINR).…”

“…In both cases, the resulting sum rates were a function of instantaneous channel gains. In a previous work, 29 researchers explored the physical-layer security of a two-way amplify-and-forward relaying, where two sources exchanged confidential messages using an untrustworthy multiuser decoding relay with the help of an external jammer to enhance the physical-layer security. A self-reliant cooperative wireless network was proposed in which the relay and jammer as energy-starved helping devices were powered by wireless energy of radio frequency (RF) signals.…”