基于CR-WFRFT的物理层安全认证方法

作为安全认证的重点研究方向,物理层认证能够节省上层的认证资源,对提高有限资源的利用具有重要意义。针对物理层认证过程安全性不高的问题,提出了一种加权分数傅里叶变换(WFRFT)与星座图旋转角度相结合的物理层认证方法。利用WFRFT的低截获性,基于星座图旋转角度的加权分数傅里叶变换物理层认证系统,能够在不对信号传输过程造成影响的前提下,通过提高计算复杂度降低认证信号的被识别概率。仿真结果表明:经过CR-WFRFT系统输出的信号被识别概率可无限接近于0,且误码率能够与原QPSK理论值相近。CR-WFRFT系统的物理层认证安全性得到了极大提高,进一步保证了信息的有效传输。

Research on Physical Layer Security Authentication Method Based on CR-WFRFT

As the key of security authentication, physical layer authentication can save the authentication resources of the upper layer to play an important role in improving the utilization of limited resources. In view of solving the problem of low security in the process of physical layer authentication, a physical layer authentication method based on weighted type fractional Fourier transform and rotation angle of constellation is proposed. With the low interception of WFRFT, weighted fractional Fourier transform physical layer authentication system based on rotation angle of constellation can reduce the recognition probability of authentication signal by increasing the computational complexity without affecting the signal transmission process. The simulation results show that the recognition probability of the signal outputted through the CR WFRFT system can be infinitely close to 0, and the BER can be close to the theoretical value of the original QPSK. The physical layer authentication security of CR WFRFT system is greatly improved, and further the effective transmission of information is ensured.