NDLI: Beamforming strategies for multi-antenna relay-assisted networks

Content Provider	IET Digital Library
Author	Mirzaee, Meysam Akhlaghi, Soroush
Abstract	Physical layer security has received considerable attentions in recent years. Moreover, cooperative communications using some nodes of network as relays make use of the benefit of multi-antenna systems such as increasing the secrecy capacity. This study studies a communication network incorporating some multi-input–multi-output amplify and forward relays in the presence of some eavesdroppers. The objective persuaded in the current work is to find the beamforming matrices at the relays to maximise the achievable secrecy rate under either individual or total power constraint at these nodes. Accordingly, three main approaches including general rank beamforming (GRBF), rank-1 beamforming (RBF) and null-space beamforming (NSBF) are developed. For the NSBF under the total power constraint, a closed-form solution is obtained, while for the remaining scenarios the corresponding optimisation problem is expressed as a semi-definite programming problem. Numerical results indicate that the RBF and NSBF methods follow GRBF in some cases and degraded from GRBF in the others. However, it is shown that these two methods have much lower complexity than GRBF.
Starting Page	1384
Ending Page	1393
Page Count	10
ISSN	17518628
Volume Number	10
e-ISSN	17518636
Issue Number	Issue 11, Jul (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/10/11
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2015.0473
Journal	IET Communications
Publisher Date	2016-07-21
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Achievable Secrecy Rate Maximisation Amplify And Forward Communication Antenna Array Array Signal Processing Beamforming Matrix Closed-form Solution Cooperative Communication General Rank Beamforming GRBF Linear Algebra Mathematical Programming Matrix Algebra MIMO Communication Multiantenna Relay-assisted Network Multiinput Multioutput Amplify And Forward Relay NSBF Null-Space Beamforming Numerical Analysis Optimisation Problem Optimisation Technique Physical Layer Security Radio Link And Equipment Rank-1 Beamforming RBF Relay Network Semidefinite Programming Problem Signal Processing And Detection Telecommunication Telecommunication Security Total Power Constraint
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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