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http://dx.doi.org/10.5515/JKIEES.2009.9.4.194

Performance of Energy Detection Spectrum Sensing with Delay Diversity for Cognitive Radio System  

Kim, Eun-Cheol (Dept. of Wireless Communications Engineering, Kwangwoon University)
Koo, Sung-Wan (Dept. of Wireless Communications Engineering, Kwangwoon University)
Kim, Jin-Young (Dept. of Wireless Communications Engineering, Kwangwoon University)
Publication Information
Journal of electromagnetic engineering and science / v.9, no.4, 2009 , pp. 194-201 More about this Journal
Abstract
In this paper, a new spectrum sensing method based on energy detection is proposed and analyzed in a cognitive radio(CR) system. We employ a delay diversity receiver for sensing the primary user's spectrum with reasonable cost and complexity. Conventional CR with the receiver equipping multiple antennas requires additional hardware and space for installing multiple antennas in accordance with increase in the number of antennas. If the number of antennas increases, detection probability as well as hardware complexity and cost rise. Then, it is difficult to make a primary user detector practically. Therefore, we adopt a delay diversity receiver for solving problems of the conventional spectrum detector utilizing multiple antennas. We derive analytical expressions for the spectrum sensing performance of the proposed system. From the simulation results, it is demonstrated that the primary user detector with the delay diversity receiver has almost half the complexity and shows similar or improved performance as compared with that employing multiple antennas. Therefore, the proposed spectrum sensing structure can be a practical solution for enhancing the detection capacity in CR system operations. The results of this paper can be applied to legacy CR systems with simple modifications.
Keywords
Cognitive Radio(CR); Delay Diversity; Energy Detection; Multiple Antennas; Receiver Complexity; Spectrum Sensing;
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