基于人工噪声与密钥矩阵的物理层安全算法

Physical-Layer Security Algorithm Based on Artificial Noise and Key Matrix

针对信号在无线通信系统中传输存在的安全问题,提出了一种基于人工噪声与密钥矩阵的物理层安全算法。该算法将传输的OFDM符号进行随机相位旋转,并添加对角密钥矩阵保护OFDM符号,加密OFDM符号在进入信道前添加人工噪声信号掩藏保护,确保了物理层安全通信。通过理论分析与仿真结果表明,算法对系统的可靠性没有影响,合法接收端能够完全解调加密信;该算法进一步扰乱信号的星座分布点,窃听者在未知密钥的情况下无法有效地应用星座图模板进行匹配识别,产生很大的误码率。另外,该算法能够有效的降低系统的峰均比。

In order to solve the security problem of signal transmission in wireless communication systems, a physical layer security algorithm based on artificial noise and key matrix is proposed. The algorithm performs random phase rotation on the transmitted signal and adds a diagonal key matrix to protect the OFDM symbol. The encrypted OFDM symbol adds artificial noise protection before entering the channel to ensure physical layer security communication. The theoretical analysis and simulation results show that the algorithm has no influence on the reliability of the system, and the legal receiver can completely demodulate the encrypted signal; this algorithm further disrupts the constellation distribution point of the signal, and the eavesdropper cannot effectively use the key in an unknown case. Constellation template matching recognition, resulting in a large bit error rate. In addition, the algorithm can effectively reduce the peak-to-average ratio of the system.