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中文摘要：
针对中继节点不可信的问题,提出了一种基于联合信道特征的中继物理层安全传输机制.首先将中继前后的两个信道等效合并为一个,得到联合信道特征.然后在联合信道特征的零空间中,增加人工噪声,使参与转发的中继节点无法获得有效信息量.仿真结果表明：当增加的人工噪声处于合法接收者信道特征的零空间时,可以提高协作中继系统的保密容量,合法接收者的误码率要远低于不可信中继;保密容量随中继数量增加的变化趋势与窃听者的分布相关.
英文摘要：
Motivated by the problem of untrusted relays,this paper proposes a physical layer security transmission mechanism of relay system based on joint channel characteristics.First of all,we combine the two channels before and after the relay into one,and get the joint channel characteristics.Then in the null space of the channel characteristics,the artificial noise is added to make the internal wire-tappers get none of the information.Simulation results show that when the artificial noise lies in the null space of the legitimate receiver＇s channel,secrecy capacity of the cooperative relay system can be improved and the bit-error ratio of the legitimate receiver is much smaller than untrusted relays.The trend of the secrecy capacity,changed by increasing relay number,relates to the distribution of eavesdroppers.
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