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SNR based secure communication via untrusted amplify-and-forward relay nodes using artificial noise

Sarma, Siddhartha and Kuri, Joy (2018) SNR based secure communication via untrusted amplify-and-forward relay nodes using artificial noise. In: WIRELESS NETWORKS, 24 (1). pp. 127-138.

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Official URL: http://dx.doi.org/10.1007/s11276-016-1318-8

Abstract

A two-phase beamforming solution for secure communication using untrusted relay nodes is presented. To thwart eavesdropping attempts of participant relay nodes, we deliberately introduce artificial noise in the source message. We observe that for certain scenarios, the source node prefers to allocate its full power to the message signal and, therefore, in the absence of artificial noise, such transmissions will be vulnerable to eavesdropping. Therefore, we provide a signal-to-noise ratio (SNR) based framework for secure communication. We intend to bring down the SNR at each of the untrusted relay nodes below a certain predefined threshold; whereas, using beamforming, we want to boost the SNR at the destination. With this motive, we evaluate the optimal scaling vector for the beamforming phase, which not only nullifies the artificial noise transmitted initially, but also maximizes the SNR at the destination. We discuss both the total and individual power constraint scenarios and provide an analytical optimal solution and an iterative algorithm, respectively.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the SPRINGER, VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
Department/Centre: Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Depositing User: Id for Latest eprints
Date Deposited: 02 Mar 2018 15:06
Last Modified: 02 Mar 2018 15:06
URI: http://eprints.iisc.ac.in/id/eprint/58891

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