DESIGN STUDY FOR A CDMA-BASED 3RD-GENERATION MOBILE RADIO SYSTEM

This paper focuses on a CDMA design study for future third-generation mobile and personal communication systems such as FPLMTS and UMTS. In the design study, a rigorous top down approach is adopted starting fro m the most essential objectives and requirements of universal third-ge neration mobile systems. Emphasis is laid on high flexibility with res pect to the implementation of a wide range of services and service bit rates including variable rate and packet services. Flexibility in fre quency and radio resource management, system and service deployment, a nd easy operation in mixed-cell and multioperator scenarios are furthe r important design goals. The system concept under investigation is ce ntered around an open and flexible radio interface architecture based on asynchronous direct-sequence CDMA with three different chip rates o f approximately 1, 5, and 20 Mchip/s. The presented CDMA system concep t forms the basis for an experimental test system (testbed) which is c urrently under development. This experimental system concept has been jointly established by the partners in the European RACE project R2020 (CODIT). The paper describes the radio transmission scheme and approp riate receiver principles and presents first performance results based on simulations.