TITLE:
An Intelligent Fuzzy Based Energy Detection Approach for Cooperative Spectrum Sensing
AUTHORS:
Sitadevi Bharatula, Meenakshi Murugappan
KEYWORDS:
Cognitive Radio (CR), Spectrum Sensing, Fuzzy System, Dynamic Spectrum Access, Energy Detection Scheme
JOURNAL NAME:
Circuits and Systems,
Vol.7 No.6,
May
27,
2016
ABSTRACT: Cognitive radio systems
are helpful to access the unused spectrum using the popular technique, referred
to as spectrum sensing. Spectrum sensing involves the detection of primary user
(PU) signal using dynamic spectrum access. Cooperative spectrum sensing takes
advantage of the spatial diversity in multiple cognitive radio user networks to
improve the sensing accuracy. Though the cooperative spectrum sensing schemes
significantly improve the sensing accuracy, it requires the noise variance and
channel state information which may lead to transmission overhead. To overcome
the drawbacks in conventional cooperative spectrum sensing, this paper proposes
a fuzzy system based cooperative spectrum sensing. Selection combining (SC) and
maximum ratio combining (MRC) are used at fuzzy based fusion center to obtain
the value of the sensing energy. These energy values are utilized in finding
the presence of PU, results in improved sensing accuracy. In addition, an
intelligent fuzzy fusion algorithm determines the PU presence without the
channel state information based on multiple threshold values. Simulation
results show that the proposed scheme outperforms the existing schemes in terms
of sensing accuracy.