Performance analysis of Alamouti scheme with transmit antenna selection in MISO systems

We consider a Multiple Input Single Output (MISO) system equipped with L
_t
transmit antennas in spatially uncorrelated Rayleigh fading channels. We consider a sub-optimum Antenna Selection (AS) scheme, wherein all the L
_t
antennas are divided into two groups with L
₁
and L
₂
antennas such that L
₁
+L
₂
= L
_t
. Assuming perfect CSI, the best single antenna within each group is selected. For the well known Alamouti transmit diversity, we derive exact closed-form expressions for the pdf of received SNR, probability of outage and SER for MPSK and MQAM constellations.