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In this paper, we study the problem of physical layer security in large-scalemultiple input multiple output (LS-MIMO) systems. The large number of antennaelements in LS-MIMO system is exploited to enhance transmission security andimprove system performance, especially when the eavesdropper is closer to theinformation source and has more antennas than the legitimate user. However, inpractical systems, the problem becomes challenging because the eavesdropperchannel state information (CSI) is usually unavailable without cooperation andthe legitimate CSI may be imperfect due to channel estimation error. In thispaper, we first analyze the performance of physical layer security withouteavesdropper CSI and with imperfect legitimate CSI, and then propose anenergy-efficient power allocation scheme to meet the demand for wirelesssecurity and quality of service (QoS) simultaneously. Finally, numericalresults validate the effectiveness of the proposed scheme.

Exploiting Large-Scale MIMO Techniques for Physical Layer Security with Imperfect Channel State Information