中文摘要：

基于信息理论物理层安全概念提出了一种点对点有线通信系统的安全通信方法.在该方法中，接收节点在接收目标信号的同时发射人工噪声，以污染窃听者的接收信道，导致窃听者接收信干噪比的下降，无法从接收信号中解调出任何有用信息.理论工作是在物理层安全模型中进行的，并假设窃听者可以执行最佳检测.推导了安全容量、干扰消除能力的表达式，并通过仿真分析了系统安全容量与导线长度、导线衰减特性、干扰消除能力以及窃听位置等因素的关系，说明了所提方法的有效性.

英文摘要：

This paper presents a secure communication method for point-to-point wired communication systems based on information theory.In the proposed method,the receiver node receives the target signal,and meanwhile transmits an artificial noise,thus leading to signal to interference plus noise ratio(SINR)loss at eavesdropper,and ensuring that the system is absolutely secure.The theoretical work of this paper is carried out in the physical layer security model,and it is assumed that the eavesdropper can perform the best detection.We deduce the expression of safety capacity and interference cancellation ability,and analyze the relationship between the system secure capacity and the length of the wire,the attenuation characteristics of the wire,the interference cancellation ability and the eavesdropping position,and the effectiveness of the proposed method is illustrated.