Spectrum sensing is a critical issue in a cognitive radio (CR). In this paper, we propose a novel spectrum-sensing algorithm that exploits the time diversity of sensing results generated by a CR spectrum sensor. In the proposed algorithm, the CR sensor combines multiple sensing results obtained at different time points to make an optimal decision on the existence of spectrum access opportunity. It considers the traffic pattern of the primary user and maximizes the spectrum utilization of the CR, given the allowable interference level to the primary user. From our mathematical analysis, the principles of combining multiple sensing results in the time domain are revealed, and the detection and the false alarm probabilities are derived.
Bibliographical noteFunding Information:
Manuscript received April 7, 2010; revised August 27, 2010, January 6, 2011, and February 16, 2011; accepted February 27, 2011. Date of current version May 16, 2011. This work was supported by the International Research and Development Program of the National Research Foundation of Korea, funded by the Ministry of Education, Science, and Technology of Korea under Grant K20901001406-09B1300-03110 (FY 2010). The review of this paper was coordinated by Prof. Y. Ma.
All Science Journal Classification (ASJC) codes
- Automotive Engineering
- Aerospace Engineering
- Electrical and Electronic Engineering
- Applied Mathematics