In this paper, an adaptive two-way relay cooperation scheme is studied for multiple-relay cognitive radio networks to improve the performance of secondary transmissions. The power allocation scheme is derived to minimize the secondary outage probability. We also provide best relay selection for the two-way relay network using a max-min criterion. Exact closed-form expressions of secondary outage probability are derived under a constraint on the quality of service of primary transmissions in terms of the required primary outage probability. To better understand the impact of primary user interference on secondary transmissions, we further investigate the asymptotic behavior of the secondary relay network when the primary signal-to-noise ratio goes to infinity, including power allocation and outage probability. Simulation results are provided to illustrate the performance of the proposed schemes.
['Qunwei Li', 'Pramod K. Varshney']
Resource Allocation and Outage Analysis for An Adaptive Cognitive Two-Way Relay Network