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We propose a new transmit antenna selection (TAS) technique that can bebeneficial for physical layer security purposes. Specifically, we show that theconventional TAS criterion based on the legitimate channel state information(CSI) is not recommended when the average signal-to-noise ratio for theillegitimate user becomes comparable or superior to that of the legitimateuser. We illustrate that an eavesdropper's based antenna selection techniqueoutperforms conventional TAS, without explicit knowledge of the eavesdropper'sinstantaneous CSI. Analytical expressions and simulation results to supportthis comparison are given, showing how this new TAS scheme is a better choicein scenarios with a strong eavesdropper.

A New Transmit Antenna Selection Technique for Physical Layer Security with Strong Eavesdropping