# Artificial Noise Injection for Securing Single-Antenna Systems

## TL;DR

This paper introduces a new artificial noise injection method for single-antenna wireless systems that enhances security against eavesdroppers, achieving perfect secrecy through optimized transmission design.

## Contribution

It presents a novel artificial noise scheme suitable for single-antenna systems, unlike traditional multi-antenna approaches, and demonstrates its effectiveness in securing communications.

## Key findings

- Perfect secrecy is achievable with proper AN design.
- The scheme is effective in quasi-static fading channels.
- It simplifies secure transmission for low-complexity transceivers.

## Abstract

We propose a novel artificial noise (AN) injection scheme for wireless systems over quasi-static fading channels, in which a single-antenna transmitter sends confidential messages to a half-duplex receiver in the presence of an eavesdropper. Different from classical AN injection schemes, which rely on a multi-antenna transmitter or external helpers, our proposed scheme is applicable to the scenario where the legitimate transceivers are very simple. We analyze the performance of the proposed scheme and optimize the design of the transmission. Our results highlight that perfect secrecy is always achievable by properly designing the AN injection scheme.