Third-generation mobile telecommunication system

Mobile communication services have become popular duc to the rapid populari zation of cellular mobile telephones. In order to offer services to an incr easing number of users and to upgrade services, the development of Third-Ge neration Mobile Telecommunication is required. Our proposed system utilizin g W-CDMA enables high-speed variable data communi cations, uninterrupted ha nd-over between communication zones, doubling of subscriber capacity and re duction of operation costs. Various actions are being taken internationally toward the establishment of a global standard for the Third-Generation Mob ile Telecommunication System, aiming at its practical application around AD 2000. The W-CDMA system has been adopted as the standard for Japan. We are developing experimental W-CDMA system equipment. For this development, man y Field Programmable Gate Array (FPGA) devices and Digital Signal Processor s (DSP) have been used to meet the changes of equipment specifications and system evaluation parameters. By developing customized Large-scale Integrat ed circuit (LSI) devices and high-speed DSP, a small-size portable phone an d a compact visual phone have been realized. Also, high-density mounting of the signal processing parts has been done in the Base Transceiver Station (BTS). In the development of a Mobile Communication Controller Simulator (M CC-SIM), the developmental period has been shortened by using our ATM switc hing system (AD8700) and generic-use PBX (Pana EXA) in the proposed system. In this paper, the features of the W-CDMA system and the outline of the ne wly developed experimental equipment have been described.