Cross layer design of cognitive radio mb-ofdm systems / by Rozeha A. Rashid, 1968-, author, Norazizah Mohd. Aripin, author, Aida E.M Hamzah, author, Norulhusna Ahmad, author, Norsheila Fisal, author, Sharifah Kamilah Syed Yusof, author, International Conference on Postgraduate Education (3rd: 2008: Pulau Pinang)