Secrecy Outage Probability of Network-Coded Cooperative Communication

TL;DR

This paper analyzes the secrecy outage probability in network-coded cooperative communications, demonstrating that network coding enhances secrecy even without channel state information, through theoretical and numerical evaluations.

Contribution

It introduces the use of network coding to improve secrecy performance in cooperative networks, especially when CSI is unavailable, supported by theoretical and numerical analysis.

Findings

Network coding reduces secrecy outage probability.

Secrecy improvement occurs even without CSI.

Theoretical and numerical results confirm effectiveness.

Abstract

We evaluate the secrecy performance of a multiple access cooperative network where the destination node is wiretapped by a malicious and passive eavesdropper. We propose the application of the network coding technique as an alternative to increase the secrecy at the destination node, on the top of improving the error performance of the legitimate communication, already demonstrated in the literature. Network coding is leveraged by assuming that the legitime cooperative nodes are able to perform non-binary linear combinations of different frames before the transmission. Different scenarios with and without channel state information (CSI) at the transmitter side are evaluated. The effectiveness of the proposed schemes is evaluated in terms of secrecy outage probability through theoretic and numerical analyses. It is shown that, even when the legitimate transmitters do not have any CSI, the secrecy can be increased through the use of network coding when compared to the direct transmission and traditional cooperative techniques.