Secure Wireless Communications via Frequency Diverse Arrays

TL;DR

This paper introduces a new FDA-assisted framework for secure wireless transmission that enhances physical layer security by optimizing frequency offsets and beamforming, outperforming traditional phased array systems.

Contribution

It proposes a novel joint optimization method for FDA parameters to improve security and reduce power consumption in wireless communications.

Findings

FDA-based framework outperforms traditional systems in security metrics

The optimization method effectively minimizes transmit power

Numerical results validate the proposed approach's superiority

Abstract

A novel frequency diverse array (FDA)-assisted secure transmission framework is proposed, which leverages additional frequency offsets to enhance physical layer security. Specifically, an FDA-assisted wiretap channel is considered, where the transmit beamforming and frequency offsets at each antenna are jointly optimized. A novel alternating optimization-based method is introduced to address the non-convex problem of secure transmission, focusing on minimizing transmit power and maximizing the secrecy rate. Numerical results are provided to demonstrate the superiority of the FDA-based framework compared to systems employing traditional phased array antennas in secure transmission.