A Novel and Secure AFDM System for High Mobility Environments

This paper introduces a novel and secure affine frequency division multiplexing (AFDM) system designed for high-mobility environments in next-generation wireless networks. Leveraging the reciprocity of wireless channels and the flexibility of the pre-chirp parameter, the system establishes secure communication by generating unique pre-chirp parameters from the shared channel properties between legitimate users, effectively excluding eavesdroppers. A quantization mechanism is incorporated to ensure robustness against noise and channel estimation errors. Simulation results demonstrate that the proposed system achieves comparable error performance to conventional AFDM and outperforms other benchmark schemes while significantly enhancing security, positioning it as a promising solution for 6G wireless communication.