IET Communications

Secrecy performance of a two‐way communication network with two half‐duplex DF relays

Shashibhusham Sharma, Sanjay Dhar Roy, Sumit Kundu

Published Dec 18, 2018• 2 citations

Abstract

In this paper, the authors evaluate the secrecy performance of a two‐way communication network via two half‐duplex decode and forward relays under an eavesdropper attacking. The sources (S1 and S2) communicate with each other via the relays in two phases. Due to the directional antennas at the relay, eavesdropper does not eavesdrop from the relay. The eavesdropper only eavesdrops the message from one of two sources at a time, which has higher strength. The total relay power is divided between two relays. An optimal value of power allocation, which minimises the secrecy outage probability (SOP), is derived under equal and different transmit power of both the sources. The optimal value of transmitting power of S1 is obtained for a fixed value of transmitting power of S2. Performance in terms of the SOP increases with increase in transmit power of the sources, supply power for relays while it may decrease with increase in transmit power of one source beyond its optimal value for a given transmit power of the other source and increase in the threshold of global secrecy rate. They derive a closed‐form expression of SOP of this proposed model. The analytical results are validated by our MATLAB based simulation results

DOI: 10.1049/iet-com.2018.5635

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