  This paper studies the transmit antenna selection in massive multiple-input
multiple-output (MIMO) system over wiretap channel. The transmitter, equipped
with a large-scale antenna array whose size is much larger than that of the
eavesdropper and legitimate receiver, selects a subset of antennas to transmit
messages. An branch-and-bound (BAB) search based algorithm for antenna
selection in independent and identical Rayleigh flat fading channel is proposed
to maximize the secrecy capacity between the transmitter and the legitimate
receiver when the transmit power is equally allocated into the active antennas.
Furthermore, the proposed algorithm is separately applied to two scenarios
which is based on whether the channel side information of the eavesdropper
(CSIE) is available. Simulation results show that the proposed algorithm has
the same performance as the exhaustive search under both scenarios but with
much lower complexity.
