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Wireless Personal Communications
Erschienen in: Wireless Personal Communications 3/2016

01.02.2016

Modelling of Cooperative Spectrum Sensing over Rayleigh Fading Without CSI in Cognitive Radio Networks

Erschienen in: Wireless Personal Communications | Ausgabe 3/2016

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Abstract

It is proved that cooperation among secondary users (SUs) in a cognitive radio network (CRN) greatly improves the spectrum sensing performance. However, modelling and analysis of cooperative spectrum sensing in a CRN over fading channels is an important issue. This paper derives a new fusion rule based on likelihood ratio test which requires exact channel statistics instead of instantaneous channel state information. This scheme provides Neyman–Pearson criteria based optimal sensing while considering both sensing and reporting channels as independently Rayleigh faded. We derive closed form solutions for local probabilities of detection and false alarm by assuming that all SUs perform energy detection, which makes real-time computations simple. Further, closed form solutions for system-level performance are derived by considering that all SUs experience independent fading and statistically identical signal-to-noise ratios. Performance of the proposed cooperative sensing scheme has been evaluated both analytically and by simulations.
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Fußnoten
1
In this context, previously in [24], the LRT statistic has been derived with simple approximations by considering reporting channels as BSC/AWGN and sensing channels as Rayleigh. However, closed form expressions for system-level performance metrics and other insights have not been investigated.
 
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Metadaten
Titel
Modelling of Cooperative Spectrum Sensing over Rayleigh Fading Without CSI in Cognitive Radio Networks
Publikationsdatum
01.02.2016
Erschienen in
Wireless Personal Communications / Ausgabe 3/2016
Print ISSN: 0929-6212
Elektronische ISSN: 1572-834X
DOI
https://doi.org/10.1007/s11277-015-2988-8

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