Performance Analysis of Cooperative MIMO System with Relay Selection and Power Allocation

In this paper, we investigate a cooperative multiple input multiple output (MIMO) system with multi-antenna relays. In order to minimize the system outage probability, we propose a new relay selection policy for this system based on the opportunistic relaying scheme. The relays are endowed with the ability of channel estimation and the maximal ratio receiver combining (MRRC) technology and beamforming are employed in the first and the second cooperative phase, respectively. Statistical optimal power allocation algorithm, close-form expression of the system outage probability and also the diversity order are presented in detail. Finally, simulation results prove the accuracy of the the theoretical analysis and also the efficiency of the new scheme which can obtain more power gains or wider coverage compared with the opportunistic relaying scheme.