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http://dx.doi.org/10.5515/KJKIEES.2011.22.4.416

Optimal Hard Decision for Cooperative Spectrum Sensing in Cognitive Radio Systems  

Lee, So-Young (Spectrum & Standardization Research Team, Korea Radio Promotion Association)
Kim, Jin-Young (Department of Wireless Communications Engineering, Kwangwoon University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.22, no.4, 2011 , pp. 416-422 More about this Journal
Abstract
In this paper, we use hard decision method for cooperative spectrum sensing. Sensing performance adopting hard decision is lower than soft decision but system load is low and the process is relatively simple when the combining scheme is hard decision compared to soft decision. In order to improve sensing performance, we propose optimal hard decision method applying weight that is based on a probability of individual sensing. Unlike conventional hard decision, we try to improve sensing performance applying weight and show the performance of the proposed method from the simulation results and performance analysis. The signal of licensed user is OFDM signal and the wireless channel between a licensed user and CR systems is modeled as Gaussian channel.
Keywords
Cognitive Radio(CR); Cooperative Spectrum Sensing; Soft Decision; Optimal Hard Decision;
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