Abstract :
In this paper, a weighted fractional Fourier transform (WFRFT) based cooperative overlay system, aiming to guarantee physical layer (PHY) security, is proposed. The paper elaborates how WFRFT and physical layer properties of the wireless medium are collaborated to guarantee the secrecy of wireless transmissions. In the proposed system, WFRFT is first preform on the secret data, such that the transmitted signal is distorted and can only be neutralized by inverse-WFRFT with the same parameter. And then two streams of the transformed sequences that bearing different messages are cooperatively and simultaneously transmitted to two legitimate receivers via a beamforming-liked method, respectively. In general, both the rapid spatial decorrelation property and the inherent security features of WFRFT are leveraged, such that only the eavesdropper´s is degraded, and hence, the wireless communication secrecy is reliably guaranteed. Numerical simulations are conducted to evaluate the performance of the proposed system in terms of the average bit error rate and the secrecy capacity.
Keywords :
Fourier transforms; array signal processing; cooperative communication; error statistics; numerical analysis; radio receivers; telecommunication security; wireless channels; WFRFT-based cooperative system; beamforming-liked method; bit error rate; cooperative overlay system; legitimate receivers; numerical simulations; physical layer properties; physical layer security; rapid spatial decorrelation property; secrecy capacity; transmitted signal; weighted fractional Fourier transform; wireless communication secrecy; Communication system security; Fourier transforms; Noise; Physical layer; Receivers; Security; Wireless communication; physical layer (PHY) security; secrecy capacity; weighted fractional Fourier transform (WFRFT);
