1. FCC ET Docket No. 03-108. Facilitating opportunities for flexible, efficient, and reliable spectrum use employing cognitive radio technologies (2003)
2. Timotheou, S., Krikidis, I.: Fairness for non-orthogonal multiple access in 5G systems. IEEE Signal Process. Lett. 22(10), 1647–1651 (2015)
3. Zhao, G., Yang, C., Li, G.Y., et al.: Power and channel allocation for cooperative relay in cognitive radio networks. IEEE J. Sel. Top. Signal Process. 5(1), 151–159 (2011)
4. Qi, S., Han, S., Chilin, I., et al.: On the Ergodic capacity of MIMO NOMA systems. IEEE Wirel. Commun. Lett. 4(4), 405–408 (2017)
5. Orumwense, E.F., Oyerinde, O., Mneney, S.: Impact of primary user emulation attacks on cognitive radio networks. Int. J. Commun. Antenna Propag. 4(1), 1–26 (2014)