Analysis of Information-Guided Transmit Antenna Selection for Security Enhancement

This paper investigates transmit antenna selection (TAS) in a multiple-input multiple-output (MIMO) wiretap channel based on a measure with dual thresholds at the legitimate receiver and the eavesdropper, respectively. Due to the fact that pilots are separated from transmit signals in time, weighting errors at the combiners are considered here. Closed-form expressions for the exact and asymptotic secure connection outage probability are derived and analysed. It is demonstrated that antenna channel hopping with fountain codes exploitation achieves a desirable secrecy diversity order, which is related to the weighting correlation coefficient and the additional transmit packet number. At last, simulation results validate the security enhancement and the actual impact of weighting errors.