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In this paper, we study the impacts of transmit antenna selection on thesecrecy performance of massive MIMO systems. We consider a wiretap setting inwhich a fixed number of transmit antennas are selected and then confidentialmessages are transmitted over them to a multi-antenna legitimate receiver whilebeing overheard by a multi-antenna eavesdropper. For this setup, we derive anaccurate approximation of the instantaneous secrecy rate. Using thisapproximation, it is shown that in some wiretap settings under antennaselection the growth in the number of active antennas enhances the secrecyperformance of the system up to some optimal number and degrades it when thisoptimal number is surpassed. This observation demonstrates that antennaselection in some massive MIMO settings not only reduces the RF-complexity, butalso enhances the secrecy performance. We then consider various scenarios andderive the optimal number of active antennas analytically using ourlarge-system approximation. Numerical investigations show an accurate matchbetween simulations and the analytic results.

Optimal Transmit Antenna Selection for Massive MIMO Wiretap Channels