Secure Communication for Two-Way Relay Networks with Imperfect CSI

Abstract

This paper considers a two-way relay network, where two legitimate users exchange messages through several cooperative relays in the presence of an eavesdropper, and the Channel State Information (CSI) of the eavesdropper is imperfectly known. The Amplify-and-Forward (AF) relay protocol is used. We design the relay beamforming weights to minimize the total relay transmit power, while requiring the Signal-to-Noise-Ratio (SNRs) of the legitimate users to be higher than the given thresholds and the achievable rate of the eavesdropper to be upper-bounded. Due to the imperfect CSI, a robust optimization problem is summarized. A novel iterative algorithm is proposed, where the line search technique is applied, and the feasibility is preserved during iterations. In each iteration, two Quadratically-Constrained Quadratic Programming (QCQP) subproblems and a one-dimensional subproblem are optimally solved. The optimality property of the robust optimization problem is analyzed. Simulation results show that the proposed algorithm performs very close to the non-robust model with perfect CSI, in terms of the obtained relay transmit power; it achieves higher secrecy rate compared to the existing work. Numerically, the proposed algorithm converges very quickly, and more than 85% of the problems are solved optimally.

Leakage rate‐based untrustworthy relay selection with imperfect channel state information: the outage and security trade‐off analysis

“…Wang et al [12] proposed a jammer selection strategy with imperfect CSI, which is based on selecting the minimum secrecy rate and maximise it, to enhance the system security against the eavesdropper. Sun et al [13] considers a HD-based two-way relaying (TWR) system model structure in the presence of a single eavesdropper. Sun et al [13] also considers that the source terminal to the eavesdropper and the relay to the eavesdropper CSIs are imperfect.…”

“…Sun et al [13] considers a HD-based two-way relaying (TWR) system model structure in the presence of a single eavesdropper. Sun et al [13] also considers that the source terminal to the eavesdropper and the relay to the eavesdropper CSIs are imperfect. In addition, Sun et al [13] utilise the beamforming technique to minimise the total relay transmit power and prevent information leakage.…”

“…Sun et al [13] also considers that the source terminal to the eavesdropper and the relay to the eavesdropper CSIs are imperfect. In addition, Sun et al [13] utilise the beamforming technique to minimise the total relay transmit power and prevent information leakage. Deng et al [14] consider a HD-based one-way information exchange traffic in the presence of the multiple eavesdroppers.…”

Secrecy Performance Enhancement for Underlay Cognitive Radio Networks Employing Cooperative Multi-Hop Transmission with and without Presence of Hardware Impairments

“…The authors of [19][20][21][22][23][24][25] considered the secrecy performance enhancement for underlay cognitive radio (UCR) networks in which transmit power of secondary users (SUs) is limited by maximum interference levels required by primary users (PUs). The authors of [26][27][28][29] proposed secure communication protocols for two-way relay networks. In [30][31][32][33], the end-to-end secrecy performance of multi-hop relaying systems is investigated.Thus far, most published works related to performance evaluation assume that transceiver hardware of wireless terminals is perfect.…”

Impact of Co-Channel Interference on Two-Way Relaying Networks with Maximal Ratio Transmission

“…[7,8] study the energy harvesting technique on TWRN under the effect of practical hardware impairments. Finally, physical layer security of AF-TWRN considering imperfect channel state information (CSI) is explored in [9].…”