人工噪声辅助时间反演的MIMO保密传输方法研究

Research on MIMO secure transmission method based on time reversal based on artificial noise

针对物理层无线传输窃听信道问题,提出了一种联合人工噪声(Artificial Noise,AN)与时间反演(Timereversal,TR)的MIMO保密传输方法,在瑞利衰落信道环境下对该方法保密传输性能进行了研究。首先对TR-MIMO信道进行了理论分析,其次根据等效信道对人工噪声矩阵进行了设计,最后对整个系统进行了保密性能的分析。理论分析和仿真结果表明,在AN功率分配因子较小时,采用该方法的保密信干噪比值比传统TR更高,系统保密容量相对于传统TR更好。

To deal with the issues of eavesdropping channel in physical layer wireless transmission,this paper proposes a MIMO secure transmission method combining artificial noise(AN) and time reversal(TR).The secure transmission performance of this method is studied in the Rayleigh fading channel.Firstly,the TR-MIMO channel is theoretically analyzed.Secondly,the artificial noise matrix is designed according to the equivalent channel.Finally,the security performance of the whole system is analyzed.Theoretical analysis and simulation results show that when the AN power distribution factor is small,the method has a higher secrecy signal-to-noise ratio than the traditional TR,and the system security capacity is better than the traditional TR.