Effect of Sensing Time on Performance of OFDM Based Opportunistic Cognitive Radio
P. Ravinder Kumar1, Archena2, Subhash S Kulkarni3, Sandeep.V.4

1P. Ravinder Kumar, Associate Professor, Department of Electronics and Communication Engineering, Jayaprakash Narayan College of Engineering Mahabubnagar-509001.(Telangana). India.
2Archena, Assistant Professor, Department of Electronics and Communications Engineering, Jayaprakash Narayan College of Engineering, Mahabubnagar, (Telangana). India.
3Dr. Subhash S Kulkarni, Professor & Head, Department of Electronics and Communication Engineering, People’s Education Society Institute of Technology, Bangalore South Campus, Bengaluru, (Karnataka). India.
4Dr. Sandeep. V.M, Department of Electrical and Electronics Engineering, Sciences, Visvesvaraya Technological University, Belgaum, Machhe, Belagavi, (Karnataka). India.
Manuscript received on December 12, 2015. | Revised Manuscript received on December 24, 2015. | Manuscript published on December 25, 2015. | PP: 12-16 | Volume-4 Issue-2, December 2015. | Retrieval Number: B1049124215
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: The increased demand on wireless communications results in spectrum congestion that cannot be solved by the static spectrum allocation. In this regard, we propose Cognitive Radio (CR) with Orthogonal Frequency Division Multiplexing (OFDM) technology. OFDM increases the data rate and CR improves the spectrum utilization opportunistically, which is usually underutilized, to the unlicensed users called cognitive users.
Keywords: Birth rate, Death rate, Efficiency, Sensing time, Transmission loss, Transmission interference.