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针对由一个发射者、一个合法接收者和一个非法接收者组成的单用户多输入多输出(MIMO,Multiple Input Multiple Output)窃听信道,研究了未知非法接收者任何信息的前提下,实现可信通信的人为干扰机制,给出了设计人为干扰的两种方式和高效的预编码算法。该算法增强了信号传播的方向性,同时最大化了人为干扰对非法接收者的影响。仿真结果表明,采用该算法的人为干扰在满足合法接收者所要求的最低信干噪声比(SINR,Signal to Interference Plus Noise Ratio)的同时,极大地降低了非法接收者的SINR。
Aiming at the Single User MIMO (Multiple Input Multiple Output) eavesdropping channel consisting of a transmitter, a legitimate receiver and an illegal receiver, the author studies the trusted communication under the premise of any information of unknown illegal receivers The human interference mechanism is given, and two ways of designing human interference and an efficient precoding algorithm are given. This algorithm enhances the directionality of signal propagation while maximizing the impact of human interference on illegal recipients. The simulation results show that the artificial interference using the proposed algorithm can significantly reduce the SINR of the illegal receiver while satisfying the minimum signal-to-interference plus noise ratio (SINR) required by legitimate receivers.