Secrecy Analysis of Transmit Antenna Selection with Hybrid GSC/SC in AF-MIMO Relay Systems

This paper studies the secrecy outage probability of transantenna selection (TAS) with hybrid generalized selection combining (GSC)/selection combining (SC) in amplify and forward (AF)-multiple multiple output (MIMO) relay system. This paper derives the exact cumulative distribution (CDF) expression of the received signal to noise ratio (SNR) for TAS with hybrid GSC/SC system. Using derived CDF, work derives the lower bound and asymptotic forms for the hybrid combining system for the secrecy outage probability. Asymptotic results shows the proposed hybrid system provides the secrecy diversity of product number of antennas in the relay node and the number with the smaller number of antennas among the source node and user node. An interesting result is that the secrecy diversity order is independent of the number combining signals and the number of eavesdroppers.