Achievable Secrecy Rate for the Relay Eavesdropper Channel with Non-Causal State Available at Transmitter and Relay

TL;DR

This paper derives an achievable perfect secrecy rate for a relay-eavesdropper channel with non-causal state information at the transmitter and relay, enhancing secure communication strategies in complex wireless networks.

Contribution

It introduces a new achievable secrecy rate for the relay eavesdropper channel with non-causal state information, generalizing existing models and validating results for AWGN channels.

Findings

Derived a new secrecy rate formula for the REC-SI model.

Validated the theoretical results through numerical simulations.

Demonstrated the model's generalization of previous work.

Abstract

In this paper, we consider a more general four-terminal memoryless relay-eavesdropper channel with state information (REC-SI) and derive an achievable perfect secrecy rate for it. We suppose that the state information is non-causally available at the transmitter and relay only. The transmitter wishes to establish a secure communication with the legitimate receiver by the help of a relay where a confidential message will be kept secret from a passive eavesdropper. We consider active cooperation between the relay and transmitter. The relay helps the transmitter by relaying the message using decode-and-forward (DF) scheme. The proposed model is a generalization of some existing models and the derived achievable perfect secrecy rate is compared to the special cases. The results are also validated numerically for the additive white Gaussian noise (AWGN) channel.