The third generation mobile communication system UMTS will enable a very flexible communication technology which means variable data rates from 8 kbit/s speech up to 2 Mbit/s data transmission. But the new standard cannot replace established systems like the European GSM and DECT, instead it is planed as an expansion of the second generation systems. That means future UMTS handhelds must be able to perform second and third generation communication technologies and also seamless system handover. To enable small handhelds and fast system handover an UMTS mobile station can only be realized with a transmitter structure which is totally software programmable, a so called software radio. All baseband functions are implemented in a general, parametrized way, so that all of them can be used for the selected standards by using different parameter sets. The air interfaces of DECT, GSM and WBCDMA have been analysed and common baseband functions have been developed and implemented.
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