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Optimising multiple antenna techniques for physical layer security

Romero Zurita, Leonardo Nabil (2014) Optimising multiple antenna techniques for physical layer security. PhD thesis, University of Leeds.

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Leonardo Nabil Romero Zurita - Optimising Multiple Antenna Techniques for Physical Layer Security.pdf - Final eThesis - complete (pdf)
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Abstract

Wireless communications offer data transmission services anywhere and anytime, but with the inevitable cost of introducing major security vulnerabilities. Indeed, an eavesdropper can overhear a message conveyed over the open insecure wireless media putting at risk the confidentiality of the wireless users. Currently, the way to partially prevent eavesdropping attacks is by ciphering the information between the authorised parties through complex cryptographic algorithms. Cryptography operates in the upper layers of the communication model, bit it does not address the security problem where the attack is suffered: at the transmission level. In this context, physical layer security has emerged as a promising framework to prevent eavesdropping attacks at the transmission level. Physical layer security is based on information-theoretic concepts and exploits the randomness and the uniqueness of the wireless channel. In this context, this thesis presents signal processing techniques to secure wireless networks at the physical layer by optimising the use of multiple-antennas. A masked transmission strategy is used to steer the confidential information towards the intended receiver, and, at the same time, broadcast an interfering signal to confuse unknown eavesdroppers. This thesis considers practical issues in multiple-antenna networks such as limited transmission resources and the lack of accurate information between the authorised transmission parties. The worst-case for the security, that occurs when a powerful eavesdropper takes advantage of any opportunity to put at risk the transmission confidentiality, is addressed. The techniques introduced improve the security by offering efficient and innovative transmission solutions to lock the communication at the physical layer. Notably, these transmission mechanisms strike a balance between confidentiality and quality to satisfy the practical requirements of modern wireless networks.

Item Type: Thesis (PhD)
Related URLs:
Keywords: Physical layer security, Wireless secrecy, MIMO, Beamforming, Optimisation, Precoding.
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Electronic & Electrical Engineering (Leeds)
The University of Leeds > Faculty of Engineering (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Institute of Integrated Information Systems (Leeds)
Identification Number/EthosID: uk.bl.ethos.638883
Depositing User: Mr Leonardo Nabil Romero Zurita
Date Deposited: 23 Feb 2015 10:07
Last Modified: 25 Nov 2015 13:48
URI: http://etheses.whiterose.ac.uk/id/eprint/7636

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