Preprocessing method based on effective path extraction in key generation system

The invention belongs to the technical field of the communication interference resistance, specifically a preprocessing method based on effective path extraction in a key generation system. A channelestimated value preprocessing scheme based on effective path extraction is proposed for a problem that the initial inconsistent rate is low in the key generation system, the path with strong power ispropagated n the time domain through the extraction signal, and other path with weak power on the time domain is filtered, thereby effectively competing the noise interference and the multi-path effect influence in the communication process, and reducing the inconsistent rate of the initial key. 本发明属于通信抗干扰技术领域，具体的说是涉及密钥生成系统中基于提取有效路径的预处理方法。本发明针对密钥生成系统中初始不致率较高的问题提出了基于提取有效路径的信道估计值预处理方案，通过提取信号在时域上功率较强的传播路径并滤去时域上其他功率较弱的路径，从而有效对抗通信过程中所受到的噪声的干扰以及多径效应的影响，降低初始密钥不致率。