00000cab a22000003a 4500 UP-99796217608881806 Buklod 20231007233946.0 m |o d | ta 090616s xx d | ||r ||||| || DENGII eng Ojanpera, T. An overview of air interface multiple access for IMT-2000 UMTS. pp. 82-86, 91-5 The basis for any air interface design is how the common transmission medium is shared between users (i.e., multiple access scheme). The underlying multiple access method for all mobile radio systems is FDMA. The performance of TDMA and CDMA has been subject to vigorous debate, without any definitive conclusions. This article gives an overview of worldwide research and standardization activities related to the multiple access schemes for third-generation mobile communications systems IMT-2000 and UMTS CDMA. FDMA. IMT-2000. OFDM. UMTS. W-CDMA. Air interface design. Air interface multiple access. Cellular radio. Hybrid schemes. Mobile radio systems. Multiple access method. Performance. Standardization activities. Standards. Third-generation mobile communications systems. Worldwide research. IEEE Communications magazine 36, 9 (1998). FO UPD DENG-II Article