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Open AccessArticle

Securing Relay Networks with Artificial Noise: An Error Performance-Based Approach

1
Communication Systems Group, Technische Universität Darmstadt, Merckstrasse 25, 64283 Darmstadt, Germany
2
Mathematical and Algorithmic Sciences Lab, Paris Research Center, Huawei Technologies France SASU, 92100 Boulogne-Billancourt, France
*
Author to whom correspondence should be addressed.
This work was presented in part in IEEE 8th Sensor Array and Multichannel Signal Processing Workshop (SAM), A Coruña, Spain, 22–25 June 2014, and the 23rd International Conference on Telecommunications (ICT), Thessaloniki, Greek, 16–18 May 2016.
Entropy 2017, 19(8), 384; https://doi.org/10.3390/e19080384
Received: 24 June 2017 / Revised: 17 July 2017 / Accepted: 18 July 2017 / Published: 26 July 2017
(This article belongs to the Special Issue Network Information Theory)
We apply the concept of artificial and controlled interference in a two-hop relay network with an untrusted relay, aiming at enhancing the wireless communication secrecy between the source and the destination node. In order to shield the square quadrature amplitude-modulated (QAM) signals transmitted from the source node to the relay, the destination node designs and transmits artificial noise (AN) symbols to jam the relay reception. The objective of our considered AN design is to degrade the error probability performance at the untrusted relay, for different types of channel state information (CSI) at the destination. By considering perfect knowledge of the instantaneous CSI of the source-to-relay and relay-to-destination links, we first present an analytical expression for the symbol error rate (SER) performance at the relay. Based on the assumption of an average power constraint at the destination node, we then derive the optimal phase and power distribution of the AN that maximizes the SER at the relay. Furthermore, we obtain the optimal AN design for the case where only statistical CSI is available at the destination node. For both cases, our study reveals that the Gaussian distribution is generally not optimal to generate AN symbols. The presented AN design takes into account practical parameters for the communication links, such as QAM signaling and maximum likelihood decoding. View Full-Text
Keywords: physical layer secrecy; untrusted relay networks; Rayleigh fading; artificial noise jamming; error maximization; KKT conditions; square quadrature amplitude modulation; symbol error rate physical layer secrecy; untrusted relay networks; Rayleigh fading; artificial noise jamming; error maximization; KKT conditions; square quadrature amplitude modulation; symbol error rate
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Liu, Y.; Li, L.; Alexandropoulos, G.C.; Pesavento, M. Securing Relay Networks with Artificial Noise: An Error Performance-Based Approach. Entropy 2017, 19, 384.

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