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Optimal MAC based cooperative spectrum sensing in cognitive radio networks

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Abstract

This paper considers a cognitive radio (CR) system in non-ideal fading wireless channels and proposes cooperative spectrum sensing schemes based on coherent multiple access channels (MAC), serving as an alternative way to improve the cooperative spectrum sensing performance and provide space diversity for spectrum sensing. Sufficient statistics are transmitted using a common channel from the secondary users (SUs) to a fusion center (FC) where the global decision is obtained. The optimal scaling factors of the proposed schemes are obtained by maximizing the detection probability under a target false alarm probability and a transmit power constraint. Because the proposed optimal MAC scheme has high computational complexity, a sub-optimal solution based on maximization of the deflection coefficient (DC) is also proposed. Simulation results show that the proposed algorithms can significantly improve the spectrum sensing performance and approach the detection baseline.

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Authors and Affiliations

  1. State Key Laboratory of Intelligent Technology and Systems, Tsinghua National Laboratory for Information Science and Technology, Department of Automation, Tsinghua University, Beijing, 100084, China

    Zhong Chen & XianDa Zhang

  2. Institute of Command Automation, PLA University of Science and Technology, Nanjing, 210007, China

    LanJuan Yang

Authors
  1. Zhong Chen
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  2. XianDa Zhang
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  3. LanJuan Yang
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Corresponding author

Correspondence to Zhong Chen.

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Chen, Z., Zhang, X. & Yang, L. Optimal MAC based cooperative spectrum sensing in cognitive radio networks. Sci. China Inf. Sci. 55, 1388–1396 (2012). https://doi.org/10.1007/s11432-012-4568-9

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  • DOI: https://doi.org/10.1007/s11432-012-4568-9

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