1. Federal Communications Commission. (2002). Spectrum policy task force report (FCC Document ET Docket No. 02-155), Nov. 2002.
2. Kumar, S., Sahay, J., Mishra, G. K., & Kumar, S. (2001). Cognitive radio concept and challenges in dynamic spectrum access for the future generation wireless communication systems. Wireless Personal Communications, 59, 525–535.
3. Mitola, J. (2000). Cognitive radio: An integrated agent architecture for software defined radio. Stockholm: Royal Inst. Tech. (KTH).
4. Mohammad, Z. P., Al Baki, M. A., & Hossain, M. (2012). Peak-to-average power ratio reduction in NC-OFDM based cognitive radio. International Journal of Signal Processing, 6, 56–64.
5. Pal, H. K., & Singh, A. K. (2013). PAPR reduction technique using advanced peak windowing method of OFDM system. International Journal of Soft Computing and Engineering, 3, 268–270.