Sampling Rate Conversion for Timing Adjustment in 3.5G Multimode Mobile Terminals

摘要

Multimode Mobile Terminals require flexible signal processing architectures to support different mobile standards like GSM/EDGE and UMTS/HSDPA in one platform with minimum hardware resources. In this paper, an efficient architecture is presented using same system clock frequency for UMTS and GSM signal processing and an all-digital asynchronous sampling rate converter. In addition, it is shown how this architecture can be efficiently used to solve the problem of timing adjustments in time continuous signals of the UMTS/HSDPA receive and transmit path. The traditional and the proposed approaches are illustrated.