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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。
Relay transmission in the communication system has the characteristics of wide coverage and overcoming the obstacles of the channel. This paper analyzes the security performance of multi-antenna relay networks based on decoding and forwarding protocols with eavesdroppers. In the system model, the multi-antenna relay uses a decoding-and-forwarding (DF) transmission scheme. The antenna receives and sends information using selective combining / transmitting antenna selection (SC / TAS), and the eavesdropper is at the source of interference. The closed expression of safety interrupt probability, the closed expression of high SNR and the closed probability of non-zero safety interrupt probability are respectively derived. The theoretical analysis and simulation results show that with the increase of the number of antennas L and the number of interference sources M on the eavesdropping end, the security of the system is obviously improved. The analysis results match the results of Monte Carlo simulation.