Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2005/09/01 Vol. E88-ANo. 9pp. 2373-2380 Type of Manuscript: Special Section PAPER (Special Section on Ultra Wideband Systems) Category: Co-existance Keyword: ultra wideband, time hopping, TD SCDMA, in-band interference, power spectrum density,