A Secure Affine Frequency Division Multiplexing System for Next-Generation Wireless Communications
Abstract
Affine frequency division multiplexing (AFDM) has garnered significant attention due to its superior performance in high-mobility scenarios, coupled with multiple waveform parameters that provide greater degrees of freedom for system design. This paper introduces a novel secure affine frequency division multiplexing (SE-AFDM) system, which advances prior designs by dynamically varying an AFDM pre-chirp parameter to enhance physical-layer security. In the SE-AFDM system, the pre-chirp parameter is dynamically generated from a codebook controlled by a long-period pseudo-noise (LPPN) sequence. Instead of applying spreading in the data domain, our parameter-domain spreading approach provides additional security while maintaining reliability and high spectrum efficiency. We also propose a synchronization framework to solve the problem of reliably and rapidly synchronizing the time-varying parameter in fast time-varying channels. The theoretical derivations prove that unsynchronized eavesdroppers cannot eliminate the nonlinear impact of the time-varying parameter and further provide useful guidance for codebook design. Simulation results demonstrate the security advantages of the proposed SE-AFDM system in high-mobility scenarios, while our hardware prototype validates the effectiveness of the proposed synchronization framework.
Keywords
Cite
@article{arxiv.2510.02023,
title = {A Secure Affine Frequency Division Multiplexing System for Next-Generation Wireless Communications},
author = {Ping Wang and Zulin Wang and Yuanhan Ni and Qu Luo and Yuanfang Ma and Xiaosi Tian and Pei Xiao},
journal= {arXiv preprint arXiv:2510.02023},
year = {2025}
}