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Physical Layer Security Using Two-Path Successive Relaying

1
Wireless Communication Centre, Faculty of Electrical Engineering, Universiti Teknologi Malaysia, Skudai 81310, Johor, Malaysia
2
School of Computing and Communications, Lancaster University, Lancaster, LA1 4YW, UK
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Leonhard M. Reindl
Sensors 2016, 16(6), 846; https://doi.org/10.3390/s16060846
Received: 4 February 2016 / Revised: 25 March 2016 / Accepted: 7 April 2016 / Published: 9 June 2016
(This article belongs to the Section Sensor Networks)
Relaying is one of the useful techniques to enhance wireless physical-layer security. Existing literature shows that employing full-duplex relay instead of conventional half-duplex relay improves secrecy capacity and secrecy outage probability, but this is at the price of sophisticated implementation. As an alternative, two-path successive relaying has been proposed to emulate operation of full-duplex relay by scheduling a pair of half-duplex relays to assist the source transmission alternately. However, the performance of two-path successive relaying in secrecy communication remains unexplored. This paper proposes a secrecy two-path successive relaying protocol for a scenario with one source, one destination and two half-duplex relays. The relays operate alternately in a time division mode to forward messages continuously from source to destination in the presence of an eavesdropper. Analytical results reveal that the use of two half-duplex relays in the proposed scheme contributes towards a quadratically lower probability of interception compared to full-duplex relaying. Numerical simulations show that the proposed protocol achieves the ergodic achievable secrecy rate of full-duplex relaying while delivering the lowest probability of interception and secrecy outage probability compared to the existing half duplex relaying, full duplex relaying and full duplex jamming schemes. View Full-Text
Keywords: wireless sensor network; 5G; physical layer secrecy; cooperative relay networks; two-path successive relaying; secrecy capacity; intercept probability; secrecy outage probability wireless sensor network; 5G; physical layer secrecy; cooperative relay networks; two-path successive relaying; secrecy capacity; intercept probability; secrecy outage probability
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Liau, Q.Y.; Leow, C.Y.; Ding, Z. Physical Layer Security Using Two-Path Successive Relaying. Sensors 2016, 16, 846.

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