@article{(Open Science Index):https://publications.waset.org/pdf/10006455,
	  title     = {Sidelobe Reduction in Cognitive Radio Systems Using Hybrid Technique},
	  author    = {Atif Elahi and  Ijaz Mansoor Qureshi and  Mehreen Atif and  Noor Gul},
	  country	= {},
	  institution	= {},
	  abstract     = {Orthogonal frequency division multiplexing (OFDM) is one of the best candidates for dynamic spectrum access due to its flexibility of spectrum shaping. However, the high sidelobes of the OFDM signal that result in high out-of-band radiation, introduce significant interference to the users operating in its vicinity. This problem becomes more critical in cognitive radio (CR) system that enables the secondary users (SUs) users to access the spectrum holes not used by the primary users (PUs) at that time. In this paper, we present a generalized OFDM framework that has a capability of describing any sidelobe suppression techniques, despite of whether one or a number of techniques are used. Based on that framework, we propose cancellation carrier (CC) technique in conjunction with the generalized sidelobe canceller (GSC) to reduce the out-of-band radiation in the region where the licensed users are operating. Simulation results show that the proposed technique can reduce the out-of-band radiation better when compared with the existing techniques found in the literature.
},
	    journal   = {International Journal of Electronics and Communication Engineering},
	  volume    = {11},
	  number    = {3},
	  year      = {2017},
	  pages     = {235 - 238},
	  ee        = {https://publications.waset.org/pdf/10006455},
	  url   	= {https://publications.waset.org/vol/123},
	  bibsource = {https://publications.waset.org/},
	  issn  	= {eISSN: 1307-6892},
	  publisher = {World Academy of Science, Engineering and Technology},
	  index 	= {Open Science Index 123, 2017},
	}