随机发送参考的多天线系统物理层安全传输算法

文中提出基于随机发送参考的多天线系统传输算法,用于保障物理层信息安全传输.该算法将授权用户的信道分解为多个独立并行的信道,并在其中的一个信道中发送随机化的导频信息,同时对其他信道加密.由于窃听方信道与授权用户不同,很难通过自身的信道分解出独立的随机化导频信道,从而无法正常解调、还原信息.通过理论分析及算法仿真表明,随机发送参考算法可使窃听方的误码率稳定在较高水平,并且在同等发送功率的情况下性能优于现有加性人工方法.

The physical layer security algorithm of MIMO system based on random reference

To transmit the information in secret with MIMO （multi-input multi-output） system, the security scheme based on the random reference is presented. In this scheme, the independent parallel channels are obtained by doing singular value decomposition. Then, the random pilot is sent to one of these channels, which encrypts the information carried on other parallel channels. Because of the discrepancy from the main channel, with the eavesdropping channel, the eavesdropper cannot decompose the independent random pilot channel to recover the information sent by transmitter. By the theoretical analysis and the simulation about the security after symbol decision module, we get a conclusion that, comparing with the existing artificial noise scheme, the random reference algorithm can be safer.