中文摘要：

通信系统中的中继传输具有覆盖范围广、克服信道障碍的特点.本文对基于解码转发协议含窃听者的多天线中继网络的安全性能进行了分析.在系统模型中,多天线中继使用解码转发（DF）传输方案,天线采用选择合并/发射天线选择（SC/TAS）的方式接收和发送信息,并且此时窃听者受到干扰源的限制.分别推导了安全中断概率的闭合表达式、高信噪比（SNR）下的渐近表达式和非0安全中断概率的闭合表达式.理论分析和仿真结果均表明,随着中继的天线数目L和窃听端受到的干扰源数目M的增多,系统的安全性能得到了明显提高,所分析的结果与蒙特卡罗仿真结果相匹配.

英文摘要：

The relay transmission in a communication system has the characteristics of wide coverage and overcoming the channel obstacle. This paper analyzes the secrecy performance of decode - and -forward（DF） for a multi -antenna relay system with Eavesdropper. In the system model, the multi -antenna relay uses a decoding- forward （DF） transmission scheme in which the antenna re- ceives and transmits information using selective combining/transmitting antenna selection （SC/ TAS）, and the eavesdropper is limited by the interference source. Then, the closed - form expres- sions for the secrecy outage probability, the asymptotic expression under the high signal to noise ratio （SNR） and the probability of non- zero secrecy capacity are derived. Both the theoretical analysis and simulation results show that the secrecy performance of the system is improved obviously with the number of relay antennas L and the number of interference sources M at the eavesdropping terminal. The results of the analysis are also consistent with Monte Carlo simulation results.