Research Article
Spectrum Sensing using Single-Radio Switched-Beam Antenna Systems
@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
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.
