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Cooperative Spectrum Sensing with Censoring of Cognitive Radios in Fading Channel Under Majority Logic Fusion

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Book cover Cognitive Communication and Cooperative HetNet Coexistence

Part of the book series: Signals and Communication Technology ((SCT))

Abstract

In a cooperative spectrum sensing (CSS) scheme, the detection of the presence of activity of a primary user (PU) is improved by the fact that several cognitive radio (CR) users send, through reporting channels (R-channels), their sensed information on the activity of this PU to a common base station (BS). The benefits are particularly relevant in scenarios where the sensing channels (S-channels) towards the PU of interest of CR users are affected by severe fading or shadowing. However, in a CSS scheme with R channels affected by fading or shadowing as well, there may be erroneous reception, at the BS, of decisions from CR users: this can be counter-acted by using censoring of CR users. In this chapter, we discuss the performance of CSS with censoring of CR users based on their R-channels’ statuses. Two schemes of censoring are considered: (i) rank-based censoring, where a pre-defined number of CR users, associated with the best R-channels, are selected; and (ii) threshold-based censoring, where CR users, whose R-channel fading coefficients exceed a pre-determined threshold, are selected. The performance of both censoring schemes is evaluated considering two different R-channel fading conditions: (i) Rayleigh fading and (ii) Nakagami-\(m\) fading. In both cases, majority logic fusion is considered at the BS (also denoted re-interpreted as fusion center, FC). The impact of various network parameters—such as censoring threshold, number of CR users, average S-and R-channels’ SNRs, channel estimation (CE) quality, and fading severity—on the performance of the considered CSS schemes will be evaluated in terms of missed detection and total error probabilities.

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Notes

  1. 1.

    Note that with the generic term CR we also refer to a secondary (cognitive) user (SU). The context eliminates any ambiguity.

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Authors and Affiliations

  1. ECE Department, NIT, Durgapur, West Bengal, India

    Srinivas Nallagonda, Sanjay Dhar Roy & Sumit Kundu

  2. Deparment of Information Engineering, University of Parma, Parma, Italy

    Gianluigi Ferrari & Riccardo Raheli

Authors
  1. Srinivas Nallagonda
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  2. Sanjay Dhar Roy
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  3. Sumit Kundu
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  4. Gianluigi Ferrari
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  5. Riccardo Raheli
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Corresponding author

Correspondence to Srinivas Nallagonda .

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Editors and Affiliations

  1. Rome, Italy

    Maria-Gabriella Di Benedetto

  2. Rennes, France

    Faouzi Bader

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Nallagonda, S., Dhar Roy, S., Kundu, S., Ferrari, G., Raheli, R. (2014). Cooperative Spectrum Sensing with Censoring of Cognitive Radios in Fading Channel Under Majority Logic Fusion. In: Di Benedetto, MG., Bader, F. (eds) Cognitive Communication and Cooperative HetNet Coexistence. Signals and Communication Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-01402-9_7

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  • DOI: https://doi.org/10.1007/978-3-319-01402-9_7

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-01401-2

  • Online ISBN: 978-3-319-01402-9

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