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Optimization of Cluster-Based Cooperative Spectrum Sensing Scheme in Cognitive Radio Networks with Soft Data Fusion

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Abstract

This paper investigates cluster-based cooperative spectrum sensing issues in two-layer hierarchical cognitive radio networks with soft data fusion. We first define a two-phase reporting protocol in the paper. In the first phase, secondary users forward their soft sensing information to cluster heads (CHs) over large-scale fading. In the second phase, all CHs transmit the aggregated soft energy information to the fusion center (FC) with different weights. Thus we derive the network false alarm (FA) and the detection probabilities as functions of the FC decision threshold, the clustering algorithm and different weights. Given a target on the detection probability, minimizing the FA probability is then formulated as a constraint optimization problem within two scenarios including additive white Gaussian noise environment and Rayleigh fading environment. A close-form upper bound of the FA probability is derived and a novel clustering scheme is also proposed for each scenario. Numerical results show that the proposed schemes achieve a satisfying performance.

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Acknowledgments

This work is supported by National Nature Science Foundation of China (NSF61121001), and Beijing Natural Science Foundation(4132050).

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Authors and Affiliations

  1. State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, China

    Ying Wang, Wenxuan Lin, Yan Huang & Weiheng Ni

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  1. Ying Wang
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  2. Wenxuan Lin
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  3. Yan Huang
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  4. Weiheng Ni
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Correspondence to Ying Wang.

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Wang, Y., Lin, W., Huang, Y. et al. Optimization of Cluster-Based Cooperative Spectrum Sensing Scheme in Cognitive Radio Networks with Soft Data Fusion. Wireless Pers Commun 77, 2871–2888 (2014). https://doi.org/10.1007/s11277-014-1673-7

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  • DOI: https://doi.org/10.1007/s11277-014-1673-7

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