Kandeepan Sithamparanathan Ana Sierra Jaime Campos Imrich Chlamtac Periodic Sensing in Cognitive Radios for Detecting UMTS/HSDPA Based on Experimental Spectral Occupancy Statistics. 1-6 2010 WCNC http://dx.doi.org/10.1109/WCNC.2010.5506657 conf/wcnc/2010 db/conf/wcnc/wcnc2010.html#SithamparanathanSCC10