7th International Conference on Cognitive Radio Oriented Wireless Networks

Research Article

Spectrum Sensing using Single-Radio Switched-Beam Antenna Systems

Download738 downloads
  • @INPROCEEDINGS{10.4108/icst.crowncom.2012.248729,
        author={Elpiniki Tsakalaki and David Wilcox and Elisabeth de Carvalho and Constantinos Papadias and Tharmalingam Ratnarajah},
        title={Spectrum Sensing using Single-Radio Switched-Beam Antenna Systems},
        proceedings={7th International Conference on Cognitive Radio Oriented Wireless Networks},
        publisher={IEEE},
        proceedings_a={CROWNCOM},
        year={2012},
        month={7},
        keywords={cognitive radio spectrum sensing smart antennas switched-beam antenna systems parasitic arrays energy detection},
        doi={10.4108/icst.crowncom.2012.248729}
    }
    
  • Elpiniki Tsakalaki
    David Wilcox
    Elisabeth de Carvalho
    Constantinos Papadias
    Tharmalingam Ratnarajah
    Year: 2012
    Spectrum Sensing using Single-Radio Switched-Beam Antenna Systems
    CROWNCOM
    IEEE
    DOI: 10.4108/icst.crowncom.2012.248729
Elpiniki Tsakalaki1,*, David Wilcox2, Elisabeth de Carvalho1, Constantinos Papadias3, Tharmalingam Ratnarajah2
  • 1: Aalborg University
  • 2: The Institute of Electronics, Communications and Information Technology, Queen’s University of Belfast
  • 3: Athens Information Technology
*Contact email: et@es.aau.dk

Abstract

The paper describes spectrum sensing using singleradio switched-beam arrays with reactance-loaded parasitic elements. At a given frequency, the antenna’s loading conditions (reactive loads) are optimized for maximum average beamforming gain in the beampattern look direction. Circular permutations of the reactive loads rotate the narrowband beampattern to different angular positions dividing the whole space around the cognitive receiver into several angular subspaces. The beampattern directionality leverages the performance of spectrum sensing algorithms like the energy detection by enhancing the receive signal-to-noise ratio. Moreover, the selection combining across the weakly correlated beampatterns gives rise to a diversity action further boosting the probability of detection.