Secrecy analysis of MRT/RAS system under Nakagami-m fading channels in the presence of imperfect channel state information

In this paper, we investigate the secrecy performance of a multiple-input multiple-output (MIMO) system in the presence of channel estimation error (CEE) and feedback delay (FD) under Nakagami-m fading channel. In specific, the legitimate transmitter uses maximum ratio transmission (MRT), in which all the antennas are used to transmit the signals. Whereas, both the legitimate receiver and eavesdropper uses receive antenna selection (RAS) scheme, in which single antenna is used to receive the largest SNR at receive end. We derive the exact closed form expressions of the average secrecy capacity (ASC) and secrecy outage probability (SOP) with imperfect channel state information (ICSI).