一种窃听用户位置未知的多播系统通信方案

Transmission synthesis scheme for a multicast system with unknown locations of eavesdroppers

为了解决窃听用户位置未知时多播系统的无线安全通信问题,结合频控阵天线阵列提出了多播系统安全通信方案。通过研究频控阵模型,对波束图进行了分析,在发射端构建了随机频控阵天线阵列。同时,在窃听用户位置未知的条件下,结合人工噪声基带信号处理方法,设计了最大化人工噪声能量的方法以优化各自多播组的加权矢量,从而提高多播系统的安全性能。仿真结果表明,所提方案实现了多播系统安全通信,并且可以精确地控制合法用户的接收信号能量。

In order to solve the problem of multicast wireless secure communication with unknown locations of the eavesdroppers,a secure communication synthesis scheme was proposed based on the frequency diverse arrays.By studying the frequency diverse arrays model and analyzing the beam pattern,a random frequency diverse array is constructed at the transmitter.At the same time,combined with the added artificial noise baseband signal processing method,the maximizing artificial noise energy method is designed to optimize the beamforming weighted vector of each multicast group,so as to improve the security performance of the multicast system.Numerical results show that the scheme realizes secure communication of a multicast system and can precisely control the signal energy received by legitimate users.