Design and Analysis of the EWFRFT-based Extended Hybrid Carrier System

In this paper, we propose a security scheme based on extended weighted fractional Fourier transform to guarantee the physical layer security of wireless communication. The proposed scheme extends the existing fractional Fourier transform and reduces the equivalent signal-to-noise ratio and recognition probability of the eavesdropper by utilizing the anti-interception characteristics of the extended hybrid carrier signal, which guaranteed the robust nonzero security capability and anti-recognition performance. Moreover, due to the extension of parameter dimension, the diversity and design flexibility of EWFRFT also have adverse impacts on wiretapping. In addition, the self-interference property of the EHC signal is proposed and analyzed in detail to further enhance the security performance. Theoretical analysis and numerical simulation results show the superiority of the EWFRFT method. Compared with the existing HC system, the proposed scheme reduces the possibility of interception by eavesdroppers without extra computational complexity, which effectively guarantees the security of the system.