1. [1] J. Mitola, “The software radio architecture,” IEEE Commun. Mag., vol.33, no.5, pp.26-38, May 1995.
2. [2] V. Chakravarthy, X. Li, R. Zhou, Z.-Q. Wu, and M. Temple, “Novel overly/underlay cognitive radio waveforms using SD-SMSE framework to enhance spectrum effciency — Part II: Analysis in fading channels,” IEEE Trans. Commun., vol.58, no.6, pp.1898-1876, June 2010.
3. [3] Zhi Yan, Xing Zhang, and Wenbo Wang, “Outage performance of relay assisted hybrid overlay/underlay cognitive radio systems,” IEEE Wireless Communication and Networking Conference (WCNC), pp.1920-1925, March 2011.
4. [4] S. Senthuran, A. Anpalagan, O. Das, and H.-Y. Kong, “Opportunistic channel sharing based on primary user transition probabilities in dual mode cognitive radio networks,” IEEE International Conference on Communications, pp.1-6, June 2011.
5. [5] H. Li and Z. Han, “Socially optimal queuing control in cognitive radio networks subject to service interruptions: To queue or not to queue?,” IEEE Trans. Wireless Commun., vol.10, pp.1656-1666, May 2011.