基于相位旋转与密钥矩阵的物理层算法

Physical Layer Algorithm based on Phase Rotation and Key Matrix

针对信号在通信系统中传输存在的安全问题,提出了一种添加相位旋转角与密钥矩阵的物理层算法。该算法在OFDM系统模型的基础上引入了一个对角密钥矩阵M,矩阵M对添加了相位角度的发射符号进行加密。这两个加密环节中,其中任何一个环节错误,将会得到不正确的输出数据,从而高效确保了物理层的安全通信。理论分析与仿真结果表明,在OFDM系统中使用该算法,可有效保证系统安全性,且不会影响原有系统的误码率、峰均比等性能。

Aiming at the security problem of signal transmission in communication system, the physical layer algorithm with phase rotation angle and key matrix is proposed. A diagonal key matrix based on the OFDM system model is introduced by this algorithm, and the transmitted symbols with phase angle is encrypted by this matrix. In these two-encryption links, if either of them is wrong, and the correct output data would not be obtained, thus to efficiently ensure secure communication of the physical layer. Theoretical analysis and simulation results indicate that the proposed algorithm could effectively guarantee the system security in the OFDM system and has no bad influence on BER, peak-to-average ratio and other performances of the original system.