【摘要】 安全问题是无线通信系统发展的关键问题之一,而无线通信因其开放性和广播性,极易受到窃听和干扰等安全威胁。传统的安全保障是通过物理层以上的密码技术实现的,而物理层缺少有效的安全措施。从物理层信号结构设计出发,利用传输信息本身的随机性,提出消息驱动调制方式加密算法和循环前缀(Cyclic Prefix,CP)随机化算法。仿真分析表明,本设计保持良好的误码特性的同时,有效的消除信号的二阶循环相关特征,信号具有低截获(Low Probability of Pntercepted,LPI)特性。更多还原

【Abstract】 Security is one of the key issues of development in wireless communication systems,and however,due to the openness and broadcast nature of wireless medium,wireless communication is always vulnerable to potential security threats such as eavesdropping,jamming,and so on. Traditional system security is always implemented by the crypo technology in the higher layers of communication protocol stack,but the physical layer lacks effective security measures. From the structural design of physical-layer signal and by making use of the transfer information itself randomness,use the transfer information itself randomness the messagedriven modulation encryption algorithm and cyclic prefix randomized algorithm are proposed. Simulation results show that the proposed algoriithm could effectively eliminate second-order correlation signal cycle characteristics while maintaining fairly good BER performance,and the signal is of( LPI) properties.更多还原