Abstract
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.
Highlights
Wireless Sensor Networks (WSN) is a rapidly emerging field and is driven by a wealth of research.In the WSN, sensor nodes collect and process environmental information
We evaluate the achievable performance of the proposed secrecy two-path successive relaying (TPSR) in terms of ergodic achievable secrecy rate, intercept probability and secrecy outage probability
The transmit power of source and relay, P is fixed to unity and the signal-to-noise ratio (SNR) for channel from node i to node j is defined as γij = 1/σj2
Summary
Wireless Sensor Networks (WSN) is a rapidly emerging field and is driven by a wealth of research. Following the broadcast nature of wireless channels, transmission between sensor nodes and base station can be overheard and possibly extracted by an eavesdropper This makes WSN highly susceptible to eavesdropping. The achievable secrecy rate and intercept probability are severely degraded due to the fading effect of wireless communication To overcome this limitation, extra cooperative node can be used to improve the secrecy [12,13]. Full-duplex relay improves achievable secrecy rate and secrecy outage probability by providing higher spectral efficiency than conventional half-duplex relay. In full-duplex jamming secrecy network, the full-duplex relay transmits jamming signal towards the eavesdroppers while concurrently receives source message, in order to achieve lower secrecy outage probability [27].
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