A new code allocation scheme for UMTS system

Abstract

Third generation wireless system is based on the CDMA access technique. In this technique, all users share the same bandwidth simultaneously but with different codes. This sharing generates interference that can reduce the system's capacity when using a weak code allocation algorithm. We analyze the WCDMA capacity as a function of the type and the number of allocated codes. We also study the method used to assign codes to the users. Finally we propose a new scheme that assigns the code allocation according to the type of user application. Simulation model and results are also provided.