A physical layer secure transmission method and system for high-speed rail wireless communication systems

Abstract

This invention belongs to the field of high-speed rail wireless communication technology and discloses a physical layer secure transmission method and system for high-speed rail wireless communication systems. The method includes: acquiring the high-speed rail wireless communication baseband signal to be transmitted and channel state information; generating an encrypted baseband signal through orthogonal transformation, nonlinear reversible encryption, and adaptive perturbation based on channel state information; obtaining an intent signal after decryption at the receiving end; acquiring the inverted baseband signal based on potential wireless eavesdropping channel monitoring and performing adversarial optimization to obtain an eavesdropping intent signal; and constructing and optimizing a wireless physical layer security loss function based on the intent signal and the eavesdropping intent signal until convergence. This invention utilizes the reciprocity of wireless channels to achieve physical layer key synchronization and effectively improves the physical layer security of high-speed rail wireless communication systems by matching channel changes in high-speed moving scenarios through adaptive perturbation.

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