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J. Electromagn. Eng. Sci > Volume 12(3); 2012 > Article
Journal of Electromagnetic Engineering and Science 2012;12(3):196-202.
DOI: https://doi.org/10.5515/JKIEES.2012.12.3.196   
Cooperative Spectrum Sensing Via Sequential Detection: A Method to Reduce the Sensing Time
Truc Tran Thanh, Hyung-Yun Kong
Dept. of Electrical. Engineering, University of Ulsan
Spectrum sensing is one of the most important functions in cognitive radio systems. In this paper, we focus on reducing the sensing time in a cooperative spectrum sensing paradigm. In the proposed scheme, a sequential detection technique is employed to provide a robust and quick detection system. Each of the secondary users measures the log-likelihood probability of the received signals and then sequentially reports to the base station. Here, the maximum ratio combining (MRC) technique is employed to reduce the average sample number (ASN) in order to reduce the sensing time. This proposed scheme is analyzed and simulated to illustrate the performance in comparison with the other given methods. Analysis and simulation are provided to validate the proposed method.
Key words: Cognitive Radio, Sequential Detection, Spectrum Sensing, Cooperative Spectrum Sensing, Maximum Ratio Combining


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