学术报告: 存在主动攻击的大规模天线安全传输(Secure Massive MIMO Transmission with an Active Eavesdropper)

2016-10-25 12:00:00


报告人:吴泳澎(德国埃尔朗根大学洪堡学者、高级研究员)
时  间:2016年10月26日10:00-12:00
地  点:信工楼A207会议室

报告人简介:吴博士,德国埃尔朗根大学洪堡学者,高级研究员,获2016年慕尼黑工大奖学金,2015年IEEE Transaction on Communication杰出审稿人,并担任IEEE Communication Letter 编委, ICC, VTC等多个国际会议执行委员会成员。主要研究方向:大规模天线系统,物理层安全,无线通信中的信号处理以及随机矩阵理论等。

报告内容:In this talk, we will discuss secure and reliable transmission strategies for multi-cell multi-user massive multiple-input multiple-output (MIMO) systems with a multi-antenna active eavesdropper. We consider a time-division duplex system where uplink training is required and an active eavesdropper can attack the training phase to cause pilot contamination at the transmitter. This forces the precoder used in the subsequent downlink transmission phase to implicitly beamform towards the eavesdropper, thus increasing its received signal power. Assuming matched filter precoding and artificial noise (AN) generation at the transmitter, we derive an asymptotic achievable secrecy rate when the number of transmit antennas approaches infinity. For the case of a single-antenna active eavesdropper, we obtain a closed-form expression for the optimal power allocation policy for the transmit signal and the AN, and find the minimum transmit power required to ensure reliable secure communication. Furthermore, we how that the transmit antenna correlation diversity of the intended users and the eavesdropper can be exploited in order to improve the secrecy rate. In fact, under certain orthogonality conditions of the channel covariance matrices, the secrecy rate loss introduced by the eavesdropper can be completely mitigated.
南昌大学科技处
信息工程学院
2016年10月25日