MISO窃听系统中的恶意导频干扰检测

Detection of Malicious Pilot Contamination in MISO Eavesdropping Systems

在一个三节点多输入单输出(Multi-Input Single-Output,MISO)窃听系统中,当窃听方在信道估计阶段发送恶意导频信号来干扰信道估计时,合法通信的保密性受到严重威胁。针对该安全问题,提出了基于估计信道协方差和基于接收信干比两种恶意导频干扰检测方案。首先概述基于估计信道协方差的恶意导频干扰检测方案原理,推导该方案下检测概率和虚警概率的解析表达式;其次给出基于接收信干比的恶意导频干扰检测方案机制及其检测概率和虚警概率的具体表达式,并通过理论分析对比得出基于估计信道协方差的检测方案性能较优;最后通过数值仿真对比分析了两种方案的干扰检测性能。

In a three-node multiple input single output(MISO) eavesdropping system,the malicious pilot contamination from the eavesdropper during the reverse training stage jams the channel estimation and threats the legitimate transmission.According to the problem,two detection schemes for malicious pilot contamination based on the estimated channel covariance and the received signal-to-interference ratio(SIR) are proposed.Firstly,the principle of the detection scheme based on estimated channel covariance is introduced,and the analytic expressions of detection probability and false alarm probability are derived.Then,the detection scheme based on the received SIR with its expression of detection probability and false alarm probability is further analyzed.It is concluded that the performance of the former scheme is better through theoretical analysis.Finally,the detection performance of the two schemes is compared by numerical simulations.