%0 Conference Paper
%B IEEE Int. Conf. on Acoustics, Speech and Signal Processing (ICASSP 2011)
%D 2011
%T Detection diversity of multiantenna spectrum sensors
%A Gonzalo Vázquez-Vilar
%A R. López-Valcarce
%A Ashish Pandharipande
%K cognitive radio
%K detection diversity
%K spectrum sensing
%X
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.
%B IEEE Int. Conf. on Acoustics, Speech and Signal Processing (ICASSP 2011)
%I IEEE
%C Prague, Czech Republic
%P 2936-2939
%8 05/2011
%G eng