Outage performance of opportunistic relaying scheme without direct link using antenna selection

The opportunistic relaying scheme with the selection of antennas at source and destination is the best option, to eliminate the insufficient use of the channel resources and low-cost low-complexity alternative to capture many of the advantages of MIMO (multiple input, multiple output) systems [1][4]. In such a scheme, the best relay as well as best antennas at source and destination can be selected for communication. In this paper, we will introduce the opportunistic amplify and forward relaying scheme without direct link using antennas selection at source and destination nodes. Under assumption of independent and not necessarily identical Rayleigh fading channel, in this proposed scheme the exact outage probability performance will be analyzed and observed that the antenna selection provides a good tradeoff between cost, complexity, and performance. On the other hand, best relay selection scheme has a strong advantage in saving the channel resources compared to regular cooperative diversity networks.