Gini index inspired robust detector for spectrum sensing over Ricean channels

The Gini index is a statistical dispersion metric widely used in economic and social sciences to measure inequalities. In this Letter, it is used to build the novel Gini index detector (GID) for cooperative spectrum sensing. The GID is blind, is robust under unequal and dynamical noise and signal powers, suits to line-of-sight channels with mild dominant component (the need for dominance is relaxed if the number of primary transmitters increases), has the constant false alarm rate property, outperforms state-of-the-art robust detectors, and is one of the simplest detectors devised so far.