Publication: IEICE TRANSACTIONS on Communications Publication Date: 2012/04/01 Vol. E95-BNo. 4pp. 1085-1092 Type of Manuscript: Special Section PAPER (Special Section on Cognitive Radio and Heterogeneous Wireless Networks in Conjunction with Main Topics of CrownCom2011) Category: Keyword: Flexible Wireless System, signal separation, signal reconstruction, short-time Fourier transform,