Optimal partner selection and power allocation for Amplify and Forward cooperative diversity

In this paper, we present a novel algorithm for partner selection and power allocation in the amplify-and-forward cooperative diversity that minimizes the required total transmit power by given outage probability constraint. We represent the problem with new formulation and solve the optimal power allocation by KKT method for a fixed set of partners. For optimal partner selection, we use a novel algorithm with low complexity to find the best set with minimum required power. We present simulation results to demonstrate that the outcomes of the proposed algorithm are very close to results of full search for optimal set.