莱斯衰落中多用户大规模MIMO系统的安全通信

Secure Communication of Multiuser Massive MIMO System over Ricean Fading Channels

研究了莱斯衰落信道中多用户集中式大规模多输入多输出(Multiple-Input Multiple-Output,MIMO)系统的安全通信问题。基站利用上行训练获取信道状态信息,之后利用最大比传输波束成形算法进行下行数据传输。基于随机矩阵理论,分别分析了合法用户和窃听者的信息速率表达式,从而得到了遍历安全速率的闭合表达式。基于获得的结果,进一步分析了极端莱斯K因子和无限发送数据功率下系统的极限安全性能。最后,通过不同条件下的实验仿真设计,验证了系统的安全性能,同时证实了所得结果的正确性。

The secure communication for multiuser massive multiple-input multiple-output(MIMO)systems in Ricean fading channels is studied.Based on the estimated channel state information by uplink pilot training,the maximum ratio transmission(MRT)precoding scheme is exploited for downlink data transmission.Using random matrix theory,the tractable expressions for the achievable ergodic information rates of the legitimate user and the eavesdropper are derived,respectively.Then,the closed-form expression for the ergodic secrecy rate is provided.According to these analytical expressions,the asymptotic results on the ergodic secrecy rates for limiting Ricean K-factor and infinite transmit power are derived.Furthermore,simulation results are presented under different conditions to evaluate the secrecy performance of the multi-user massive MIMO system and corroborate the obtained results in this paper.