Traffic-knowledge-based relay selection for asymmetric two-way AF relaying networks

A novel relay selection criterion, in which the traffic-knowledge is utilized, is proposed for asymmetric two-way amplify-and-forward (AF) relaying networks. The system outage probability, diversity gain and coding gain are then investigated, and closed-form expressions are presented. Simulation results verify the accuracy of our derived outage probability expressions and highlight the performance of the proposed relay selection policy.