Outage probability of cognitive decode-and-forward two-way relay networks

Outage probability is one of the most important measurements for evaluating system performance and analyzing system characteristics. This paper presents an analytical study on the outage probability of cognitive decode-and-forward (DF) two-way relay networks for the three time-slot time division broadcast (TDBC) bidirectional protocol. The outage probability is defined by jointly considering outage events in the three time slots. The received signal-to-noise ratios (SNRs) in the third time slot depend on the interference power constraint to the primary users. These are used to derive a closed-form outage probability expression. The theoretical analysis is validated through Monte Carlo simulations.