Sensing period considerations in fading environment for multimedia delivery in cognitive Ultra Wideband system / Tekijä Rozeha A. Rashid, author, Norazizah Mohd. Aripin, author, Norsheila Fisal, author, S. K. Syed-Yusof, author, International Conference on Signal and image Processing Applicationg (2009 : Kuala Lumpur)