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This paper studies the impact of transmit antenna selection on the secrecyperformance of massive MIMO wiretap channels. We consider a scenario in which amulti-antenna transmitter selects a subset of transmit antennas with thestrongest channel gains. Confidential messages are then transmitted to amulti-antenna legitimate receiver while the channel is being overheard by amulti-antenna eavesdropper. For this setup, we approximate the distribution ofthe instantaneous secrecy rate in the large-system limit. The approximationenables us to investigate the optimal number of selected antennas whichmaximizes the asymptotic secrecy throughput of the system. We show thatincreasing the number of selected antennas enhances the secrecy performance ofthe system up to some optimal value, and that further growth in the number ofselected antennas has a destructive effect. Using the large-systemapproximation, we obtain the optimal number of selected antennas analyticallyfor various scenarios. Our numerical investigations show an accurate matchbetween simulations and the analytic results even for not so large dimensions.

Optimal Number of Transmit Antennas for Secrecy Enhancement in Massive MIMOME Channels