吉林大学学报(工学版) ›› 2011, Vol. 41 ›› Issue (02): 537-0542.

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Adaptive dual threshold cooperative spectrum sensing based on grouping

DING Han-qing1,2,YANG Jia-wei1, ZHAO Zhi-yuan1   

  1. 1.State Key Lab of Integrated Service Networks, Xidian University, Xi'an 710071, China|2.School of Computer and Communication Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002,China
  • Received:2010-01-25 Published:2011-03-01

Abstract:

An improved cooperative spectrum sensing mechanism is proposed to mitigate the adverse effects of the conventional cooperative spectrum sensing mechanism over unfavorable reporting channels in Cognitive Ratio (CR) system. All CR users are divided into several groups. In each group, the CR user with the largest reporting channel gain is selected as the central node. After performing cooperative spectrum sensing with adaptive dual threshold, the central node forwards its sensing result to the Cognitive Ratio Base Station (SRBS). Then the CRBS fuses the results from all groups to decide the presence or absence of the authorized users. Simulation results indicate that this method can lower the bit error rate of reporting channel. It also decreases the average data overhead with almost the same detection performance as the conventional cooperative spectrum sensing.

Key words: communication, cognitive system, cooperative spectrum sensing, adaptive dual threshold

CLC Number: 

  • TN911.23
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