NDLI: Maximising the minimum achievable secrecy rate of two-way relay networks using the null space beamforming method

Content Provider	IET Digital Library
Author	Khordad, Erfan Akhlaghi, Soroush Mirzaee, Meysam
Abstract	This study concerns maximising the minimum achievable secrecy rate (ASR) of a two-way relay network in the presence of an eavesdropper, in which two nodes aim to exchange messages in two hops, using a multi-antenna relay. Throughout the first hop, the two nodes simultaneously transmit their messages to the relay. In the second hop, the relay broadcasts a combination of the received information to the users such that the transmitted signal lies in the null space of the eavesdropper's channel; this is called null space beamforming (NSBF). The best NSBF matrix for maximising the minimum ASR is studied, showing that the problem is not convex in general. To address this issue, the problem is divided into three sub-problems: a close-to-optimal solution is derived by using the semi-definite relaxation technique. Simulation results demonstrate the superiority of the proposed method w.r.t. the most well-known method addressed in the literature.
Starting Page	793
Ending Page	800
Page Count	8
ISSN	17518628
Volume Number	11
e-ISSN	17518636
Issue Number	Issue 6, Apr (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/11/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2016.0470
Journal	IET Communications
Publisher Date	2016-12-06
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Algebra Antenna Array Signal Processing ASR Eavesdropper Channel Matrix Algebra Minimum Achievable Secrecy Rate Maximisation Multi-antenna Relay NSBF Matrix Null Space Beamforming Method Radio Link And Equipment Relay Network Semidefinite Relaxation Technique Signal Processing And Detection Single Antenna Telecommunication Two-way Relay Network
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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