多组多播集中式大规模MIMO系统的安全性能分析

分析了主动攻击下的多组多播集中式大规模多输入多输出(Multiple-Input Multiple-Output,MIMO)系统的安全性能。基于上行导频训练估计的信道状态信息,系统采用功率限制下的共轭波束成形方案实现下行多播传输。通过分析合法用户安全速率的下界和窃听者信息速率的上界,得到了系统安全速率下界的闭合表达式。进一步,推导出基站天线数趋于无穷大情况下此安全传输系统能获取的极限安全速率。实验仿真验证了所得结果的正确性。

Secure Performance Analysis of Multigroup Multicasting Co-located Massive MIMO Systems

This paper presents the secure performance analysis of multigroup multicasting co-located massive multiple-input multiple-output(MIMO) networks with an active eavesdropper.Based on the estimated channel state information by the uplink training,the conjugate beamforming with power constraint scheme is used for downlink multicasting transmission.A lower bound for the achievable information rate of legitimate user and an upper bound on the information leakage of the eavesdropper are derived,respectively.Then,the tractable closed-form expression of a lower bound on the achievable secrecy rate is obtained.In addition,the asymptotic secrecy performance of the considered system is provided when the number of base station antennas tends to infinity.Simulations are operated to verify the correctness of the derived results.