[1] Sun Dafei, Song Tiecheng, Wu Ming, et al. Optimal decision threshold for soft decision cooperative spectrum sensing [J]. Journal of Southeast University (English Edition), 2013, 29 (4): 355-360. [doi:10.3969/j.issn.1003-7985.2013.04.001]

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Optimal decision threshold for soft decision cooperative spectrum sensing()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

29

Issue:

2013 4

Page:

355-360

Research Field:

Information and Communication Engineering

Publishing date:

2013-12-20

Info

Title:

Optimal decision threshold for soft decision cooperative spectrum sensing

Author(s):

Sun Dafei¹;  2;  Song Tiecheng¹;  Wu Ming¹;  Hu Jing¹;  Guo Jie¹;  Gu Bin¹

¹National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China
²College of Science, Nanjing University of Technology, Nanjing 210009, China

Keywords:

cognitive radio;  cooperative spectrum sensing;  energy detection;  decision threshold

PACS:

TN911.23

DOI:

10.3969/j.issn.1003-7985.2013.04.001

Abstract:

In order to achieve higher spectrum efficiency in cognitive radio (CR) systems, a closed-form expression of the optimal decision threshold for soft decision cooperative spectrum sensing based on the minimum total error probability criterion is derived. With the analytical expression of the optimal decision threshold, the impact of different sensing parameters on the threshold value is studied. Theoretical analyses show that the optimal threshold achieves an efficient trade-off between the missed detection probability and the false alarm probability. Simulation results illustrate that the average signal-to-noise ratio(SNR)and the soft combination schemes have a great influence on the optimal threshold value, whereas the number of samples has a weak impact on the optimal threshold value. Furthermore, for the maximal ratio combing (MRC) and the modified deflection coefficient (MDC) schemes, the optimal decision threshold value increases and approaches a corresponding individual limit value while the number of CR users increases. But the number of CR users has a weak influence on the optimal decision threshold for the equal gain combining (EGC) scheme.

References:

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[4] Liang Y, Zeng Y, Peh E, et al. Sensing-throughput tradeoff for cognitive radio networks [J]. IEEE Trans Wireless Commun, 2008, 7(4): 1326-1337.
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[9] Luo L, Roy S. Efficient spectrum sensing for cognitive radio networks via joint optimization of sensing threshold and duration [J]. IEEE Trans Commun, 2012, 60(10): 2851-2860.
[10] Gong S, Wang P, Huang J. Robust performance of spectrum sensing in cognitive radio networks [J]. IEEE Trans Wireless Commun, 2013, 12(5): 2217-2227.

Memo

Memo:

Biographies: Sun Dafei(1976—), male, graduate; Song Tiecheng(corresponding author), male, doctor, professor, songtc@seu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No.61271207, 61372104), the National Science and Technology Major Project(No.2010ZX03006-002-01), the Specialized Development Foundation for the Achievement Transformation of Jiangsu Province(No.BA2010023).
Citation: Sun Dafei, Song Tiecheng, Wu Ming, et al. Optimal decision threshold for soft decision cooperative spectrum sensing[J].Journal of Southeast University(English Edition), 2013, 29(4):355-360.[doi:10.3969/j.issn.1003-7985.2013.04.001]

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