Secrecy analysis of alamouti scheme using feedback-rate efficient transmit antenna selection with robust error performance in the presence of feedback errors

This paper proposes a new feedback rate efficient transmit antenna selection (TAS) with Alamouti scheme (AS) with robust error performance which improves physical layer security (PLS) in multiple-input-multiple-output (MIMO) wiretap channel. The proposed scheme is accomplished in two steps (1) The transmitter fixes one antenna and then transmitter select the strongest antenna out of remaining NT-1 ones, depending on the feedback from receiver (2) The AS is applied at the fixed antennas for data transmission. Two different scenarios based on availability of channel state information of eavesdropper at the transmitter are examined. The proposed scheme achieves higher average secrecy capacity (ASC) and lower secrecy outage probability (SOP) by selecting two antennas. The result shows that ASC is higher for lower value of signal to noise (SNR) at eavesdropper.