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.
@article{arxiv.2412.20549,
title = {Secure Wireless Communications via Frequency Diverse Arrays},
author = {Zhenqiao Cheng and Chongjun Ouyang and Xingqi Zhang},
journal= {arXiv preprint arXiv:2412.20549},
year = {2025}
}