Performance analysis of relay selection for two-way cooperative relay networks

In this paper, we investigate relay selection for a two-way cooperative relaying network. In our scheme, the best-worse criterion is used to select a preferred relay each time to perform amplify-and-forward relaying. The closed-form expression of probability density function (PDF) and cumulative density function(CDF) of the two-way SNRs for our scheme are derived. It is shown that the best-worse scheme achieves full diversity gain. The asymptotic packet error rate (PER) performance of our scheme is also examined through rigorous analysis. Simulation results show that our derived results for the best-worse relay selection scheme is consistent with the numerical results.