NDLI: Secure communications with untrusted relays: a multi-pair two-way relaying approach

Content Provider	IET Digital Library
Author	Zhao, Tantan Li, Guobing Lv, Gangming Zhang, Yizhen
Abstract	Physical-layer security is usually ensured by the injection of artificial noise (AN) at the legitimate source or destination when relays are cooperative but untrusted. In this work, in order to avoid the power-consuming AN at the legitimate user pairs, the authors investigate multi-pair two-way relaying as a solution for secure transmission in wireless relay networks with untrusted relays. They formulate a generalised problem for the joint design of cooperative beamforming (CB) and AN at relays to maximise the secrecy sum-rate in wireless networks with multi-pair legal users, multiple untrusted relays as well as multiple non-colluding eavesdroppers. Further, they reformulate, approximate and relax the original non-convex problem into a sequence of convex sub-problems based on semi-definite relaxation (SDR) and Taylor series approximation. Particularly, for the reformulated problem they prove that the SDR is in fact tight, and hence propose an iterative algorithm for CB and AN design at the relays. In the simulations, they demonstrate the fast convergence and high achievable secrecy sum-rate of the proposed algorithm. Also, they simulate and discuss the impact of the number of user pairs on the secrecy sum-rate, and reveal the change of performance gain with the number of multiple user pairs.
Starting Page	2552
Ending Page	2560
Page Count	9
ISSN	17518628
Volume Number	12
e-ISSN	17518636
Issue Number	Issue 20, Dec (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/12/20
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2018.5640
Journal	IET Communications
Publisher Date	2018-09-12
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Approximation Theory Array Signal Processing Artificial Noise Injection Concave Programming Convex Programming Convex Subproblems Cooperative Beamforming Cooperative Communication Interpolation And Function Approximation Iterative Algorithm Iterative Method Legitimate Source Legitimate User Pairs Multipair Legal User Multipair Two-way Relaying Multiple Noncolluding Eavesdroppers Multiple Untrusted Relay Multiple User Pairs Nonconvex Problem Numerical Analysis Optimisation Technique Physical-layer Security Radio Link And Equipment Radio Network Relay Network Secrecy Sum-rate Maximisation Secure Communication Secure Transmission Semidefinite Relaxation Signal Processing And Detection Taylor Series Approximation Telecommunication Telecommunication Security Wireless Relay Network
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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