@conference {VazquezValcarceICASSP11, title = {Detection diversity of multiantenna spectrum sensors}, booktitle = {IEEE Int. Conf. on Acoustics, Speech and Signal Processing (ICASSP 2011)}, year = {2011}, month = {05/2011}, pages = {2936-2939}, publisher = {IEEE}, organization = {IEEE}, address = {Prague, Czech Republic}, abstract = {
In the context of spectrum sensing, we investigate the performance\ of detectors equipped with M antennas (co-located or\ distributed) under Rayleigh fading, in terms of detection diversity.\ Rather than the high-SNR concept of diversity order\ common in the communications literature, we adopt the notion\ recently advocated by Daher and Adve in the radar community:\ the slope of the average probability of detection (\bar{P}_D)\ vs. SNR curve at \bar{P}_D = 0.5. This definition is well suited to\ spectrum sensing, which invariably deals with low SNR levels.\ It is shown that the diversity order grows as M for an\ optimal centralized detector having access to all observations,\ whereas for the two distributed schemes considered (the multiantenna\ energy detector and the OR detector) it grows no\ faster than √M.
}, keywords = {cognitive radio, detection diversity, spectrum sensing}, author = {Gonzalo V{\'a}zquez-Vilar and R. L{\'o}pez-Valcarce and Ashish Pandharipande} }