有限字符输入系统的物理层安全传输条件

发布时间：2018-04-03 00:01

本文选题：无线通信　切入点：无线物理层安全　出处：《电子与信息学报》2014年06期

【摘要】：针对无线数字通信系统中人工噪声方法可被多天线窃听者破解的问题,该文提出有限字符输入下物理层安全传输的一个充分条件,并以此为指导设计了一种类符号人工噪声方法。分析表明,人工噪声方法下,有限字符输入信号和窃听者无噪接收信号之间的等效信道是一个离散有噪无损信道(Discrete Noisy Lossless Channel,DNLC)。由于DNLC输入信号的可逆性为窃密提供了必要条件,窃听者通过增加天线可使窃听信道容量达到合法用户的信道容量上限,致使系统的保密互信息为零,因此破坏输入信号的可逆性是有限字符输入下物理层安全传输的一个充分条件。类符号人工噪声方法满足这一充分条件,可以保证物理层安全传输,仿真结果也表明了该方法的有效性。
[Abstract]:In order to solve the problem that artificial noise method in wireless digital communication system can be deciphered by multi-antenna eavesdroppers, this paper presents a sufficient condition for the secure transmission of physical layer under finite character input.Based on this, a method of symbol artificial noise is designed.The analysis shows that the equivalent channel between the finite character input signal and the eavesdropper's noiseless received signal is a discrete Noisy Lossless channel under the artificial noise method.Because the reversibility of the DNLC input signal provides the necessary condition for stealing secret, eavesdroppers can increase the channel capacity of eavesdropping channel to the upper limit of the channel capacity of legitimate users by increasing the antenna, so that the confidential mutual information of the system is zero.Therefore, destroying the reversibility of input signal is a sufficient condition for the physical layer to transmit safely under the finite character input.The symbolic artificial noise method satisfies this sufficient condition and can guarantee the secure transmission in the physical layer. The simulation results also show the effectiveness of the method.
【作者单位】：国家数字交换系统工程技术研究中心;
【基金】：国家自然科学基金(61171108)资助课题
【分类号】：TN918

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