3rd Generation cellular systems (IMT2000); Radio Interface Technologies of Third Generation Systems; WCDMA: Logical and Physical Channels, CDMA Spreading, Multirate Operation, Packet Data, Handover, Interoperability between GSM and WCDMA; CDMA2000: Logical and Physical Channels, CDMA Spreading, Multirate Operation, Packet Data; Time Division CDMA; 4th Generation Mobile Systems; Orthogonal Frequency Division Modulation (OFDM); OFDM-CDMA; Efficient modulation and coding schemes; Multiuser detection; Heterogeneous wireless networks