Tomoya Tandai Tomoya Horiguchi Noritaka Deguchi Takeshi Tomizawa Tazuko Tomioka A Study on Cognitive Radio Coexisting with Cellular Systems. 38-52 2008 91-B IEICE Transactions 1 http://dx.doi.org/10.1093/ietcom/e91-b.1.38 db/journals/ieicet/ieicet91b.html#TandaiHDTT08