Secrecy Outage Probability Performances of Transmit Antenna Selection Schemes in Multi-User MIMO-OFDMA Systems

This study examines the communications reliability and secrecy performance of multi-user orthogonal frequency division multiple access scheme employing different transmit antenna selection (TAS) methods combined with maximal-ratio combining at the user equipments (UEs). The average bit error rate (BER) and secrecy outage probability (SOP) performances of the multi-antenna schemes are examined for frequency-selective Rayleigh fading channels via Monte Carlo simulations. For the average BER investigation and validation purposes of the simulations, two different assumptions on channel correlation characteristics are considered. While assessing the average SOP performance, a realistic scenario where eavesdropper might detect and access the subcarrier indices of the legitimate users with a normalized rate of β
Eve
is taken into account. In addition, the variation of the SOP performance has been revealed for different values of β
Eve
, the targeted secrecy capacity and the number of receive antennas at the UEs in order to provide deeper insights.