Noriyuki Maeda Yoshihisa Kishiyama Hiroyuki Atarashi Mamoru Sawahashi Variable Spreading Factor-OFCDM with Two Dimensional Spreading that Prioritizes Time Domain Spreading for Forward Link Broadband Wireless Access. 487-498 2005 88-B IEICE Transactions 2 http://dx.doi.org/10.1093/ietcom/E88-B.2.487 db/journals/ieicet/ieicet88b.html#MaedaKAS05