Selective cooperation with untrusted relays for physical‐layer security in wireless multipair two‐way relaying networks

Abstract

In this paper, the selective cooperation with untrusted relays is studied for wireless multipair two‐way relay networks. We first investigate the feasibility of secure transmission in the presence of cooperative but untrusted relays and then formulate a general optimization problem of secrecy sum‐rate maximization under the constraints of relay selection. By decomposing the original problem into solvable subproblems, we develop a low‐complexity greedy algorithm for selective cooperation, in which the untrusted relays are selected as cooperators or the potential eavesdroppers according to the overall contributions to the secrecy sum rate. Simulation results reveal that the proposed greedy algorithm for selective cooperation with untrusted relays achieves performance gain both in instantaneous and average secrecy sum rate and that the algorithm can converge quickly with the iterations.

On the secrecy rate balancing problem of two‐way multiple‐input multiple‐output relaying networks using rank‐1 beamforming strategy

“…Accordingly, a tremendous amount of research is devoted to exploring effective transmission strategies in such networks to enhance the secrecy rate problem. [11][12][13][14] The works in Mirzaee et al, 15,16 extended the problem to a more general case of incorporating multiple multi-antenna relays and some single-antenna eavesdroppers. In work of Jenog et al, 17 studied the problem of joint transmit and relay beamforming vectors in terms of maximizing the achievable secrecy rate in multi-antenna Amplify and Forward (AF) relay-assisted one-way network with a direct transmitter-to-receiver link.…”

“…Using relays to enhance the physical layer secrecy has been extensively studied in relay‐assisted one‐way and two‐way networks. Accordingly, a tremendous amount of research is devoted to exploring effective transmission strategies in such networks to enhance the secrecy rate problem 11‐14 . The works in Mirzaee et al, 15,16 extended the problem to a more general case of incorporating multiple multi‐antenna relays and some single‐antenna eavesdroppers.…”

Enhancing physical layer security via a UAV friendly jammer for NOMA‐based IoT systems with imperfect CSI

“…16 Exploiting the dynamics in the physical layer, physical layer security has recently shown to support secure transmissions and emerged as an appealing method to provide perfect secrecy. [17][18][19][20] In the context of cooperative NOMA, physical layer security has attracted increasing research interests. [21][22][23][24][25][26] In the work of Vo et al, 21 the authors considered imperfect channel state information (CSI) and analyzed the secrecy and throughput of a cooperative NOMA energy harvesting IoT system in the presence of untrust relays.…”

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

“…Further, to enhance the secrecy performance and to reduce the energy consumption of the networks, the opportunistic relay selection (ORS) strategy is widely investigated. [31][32][33][34][35][36][37][38][39] Specifically, Chen et al 31 have proposed various joint relay and jammer selection schemes to enhance the security of TWR networks. Zhang et al 32 have investigated the optimal and suboptimal relay selection strategy for TWR systems in the presence of multiple eavesdroppers.…”

“…Zhang et al 33 have proposed a novel relay selection strategy to improve the security of TWR networks using the duality-aware cooperation strategy. The secrecy performance of multipair two-way untrusted relay networks with multiple relay selection scheme has been analyzed by Zhao et al 34 In the presence of multiple DF relays, 35 the secrecy performance of TWR networks with an optimal relay selection scheme has been investigated. Ibrahim et al 36 have investigated the relay and jammer selection schemes for enhancing the secrecy performance of DF-based TWR networks.…”