  In this work, we study the performance of a single relay Multiple Input
Multiple Output (MIMO) cooperative communication system based on Decode and
Forward (DF) relaying protocol for two strategies using transmit antenna
selection at the source. The first strategy uses one antenna between the relay
and the destination, and the second strategy uses Space Time Block Coding
(STBC). All channels follow the Rayleigh fading distribution. We derive the
expression and Upper Bound for Symbol Error Rate (SER) for M-ary Phase Shift
Keying (M-PSK), and the diversity order for both strategies. The analytical
results show that the second strategy performs better than the first one for
the same diversity order and the same Rate R.
