ws 14(1): e2

Research Article

Spectrum Sensing and Primary User Localization in Cognitive Radio Networks via Sparsity

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  • @ARTICLE{10.4108/ws.1.1.e2,
        author={Lanchao Liu and Zhu Han and Zhiqiang Wu and Lijun  Qian},
        title={Spectrum Sensing and Primary User Localization in Cognitive Radio Networks via Sparsity},
        journal={EAI Endorsed Transactions on Wireless Spectrum},
        volume={1},
        number={1},
        publisher={ICST},
        journal_a={WS},
        year={2014},
        month={4},
        keywords={Compressive sensing, decentralized spectrum sensing, localization, cognitive radio networks.},
        doi={10.4108/ws.1.1.e2}
    }
    
  • Lanchao Liu
    Zhu Han
    Zhiqiang Wu
    Lijun Qian
    Year: 2014
    Spectrum Sensing and Primary User Localization in Cognitive Radio Networks via Sparsity
    WS
    ICST
    DOI: 10.4108/ws.1.1.e2
Lanchao Liu1, Zhu Han1,*, Zhiqiang Wu2, Lijun Qian3
  • 1: Department of Electrical and Computer Engineering, University of Houston, Houston, TX, USA
  • 2: Department of Electrical Engineering, Wright State University, Dayton, Ohio, USA
  • 3: Department of Electrical and Computer Engineering, Prairie View A&M University, Prairie View, TX, USA
*Contact email: zhan2@uh.edu

Abstract

The theory of compressive sensing (CS) has been employed to detect available spectrum resource in cognitive radio (CR) networks recently. Capitalizing on the spectrum resource underutilization and spatial sparsity of primary user (PU) locations, CS enables the identification of the unused spectrum bands and PU locations at a low sampling rate. Although CS has been studied in the cooperative spectrum sensing mechanism in which CR nodes work collaboratively to accomplish the spectrum sensing and PU localization task, many important issues remain unsettled. Does the designed compressive spectrum sensing mechanism satisfy the Restricted Isometry Property, which guarantees a successful recovery of the original sparse signal? Can the spectrum sensing results help the localization of PUs? What are the characteristics of localization errors? To answer those questions, we try to justify the applicability of the CS theory to the compressive spectrum sensing framework in this paper, and propose a design of PU localization utilizing the spectrum usage information. The localization error is analyzed by the Cramér-Rao lower bound, which can be exploited to improve the localization performance. Detail analysis and simulations are presented to support the claims and demonstrate the efficacy and efficiency of the proposed mechanism.