The objective of this study is to examine the outage probability (OP) performance of the multiple-input multiple-output (MIMO) cooperative communication system over Nakagamim fading channel conditions. Source node transmits orthogonal space time block code (OSTBC) codeword to the relay & destination node and maximal ratio combiner (MRC) is used for the decoding purpose at the destination node. A mathematical framework is developed for the analysis of diversity order (DO) of the system. The closed form expression of OP is derived in terms of confluent hypergeometric function of two variables considering perfect channel state information (CSI). The Simulation results verified the accuracy of the derived analytical results. Furthermore, the results shown that the distances between the nodes significantly affect the OP performance.

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In this work, we consider a single relay multiple input multiple output (MIMO) spacetime block-code (STBC) based relaying system for two strategies using transmit antenna selection (TAS) technique. We consider the Rayleigh distribution between source to destination (SD), relay to destination (RD) and source to relay (SR) fading channel links. In first selection strategy, we consider selective decode and forward (SDF) protocol between the relay and destination and in second selection strategy, we consider STBC SDF protocol between RD fading channel links. We derive the closed form expressions for SER, SER upper bound and diversity order (DO). The optimal power allocation factors (OPFs) are derived for the both strategies, which minimize the SER of the relaying system. Simulation results show that the second strategy performs better than the first one for the same DO.

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