Secure Compute-and-Forward Transmission With Artificial Noise and Full-Duplex Devices

TL;DR

This paper proposes a secure communication scheme using scaled compute-and-forward with artificial noise in a full-duplex relay scenario, enhancing secrecy in 5G-like networks with unknown eavesdropper channels.

Contribution

It introduces a novel secure transmission method with full-duplex devices and artificial noise, not previously explored in this context.

Findings

Derived bounds on secrecy outage probability under Rayleigh fading

Established achievable secrecy-outage rates for the proposed scheme

Demonstrated the effectiveness of artificial noise in enhancing security

Abstract

We consider a wiretap channel with an eavesdropper (Eve) and an honest but curious relay (Ray). Ray and the destination (Bob) are full-duplex (FD) devices. Since we aim at not revealing information on the secret message to the relay, we consider the scaled compute-and-forward (SCF) where scaled lattice coding is used in the transmission by both the source (Alice) and Bob in order to allow Ray to decode only a linear combination of the two messages. At the same time Ray transmits artificial noise (AN) to confuse Eve. When Ray relays the decoded linear combination, Alice and Bob are transmitting AN against Eve. This can be a 5G cellular communication scenario where a mobile terminal (MT) aims at transmitting a secret message to a FD base station (BS), with the assistance of a network FD relay. With respect to existing literature the innovations of this paper are: a) Bob and Ray are FD devices; b) Alice, Ray and Bob transmit also AN; and c) the channel to Eve is not known to Alice, Bob and Ray. For this scenario we derive bounds on both the secrecy outage probability under Rayleigh fading conditions of the channels to Eve, and the achievable secrecy-outage rates.