WIRELESS FLEXIBLE PERSONALIZED COMMUNICATIONS	COST 259
Working Groups

The activities may be grouped as follows:

Researches on Access Schemes, such as JD(Joint Detection)-CDMA, Slow Frequency Hopping-CDMA, CTDMA (to be considered as a sort of merging of Advanced TDMA schemes into CDMA), Multi-Carrier techniques, in a vision that ensures a progressive and smooth migration from second generation (GSM) to future generation systems; OFDM in particular, seems to be suitable for applications in distributed networks, where an efficient use of non-linear amplifiers is needed, leading to significant out-of-band radiation with non-constant envelope signals;

Studies on flexible rates (bandwidth on demand): UMTS/MBS/WLANs should be characterised by high transport capacity at various data rates, in order to accommodate a multitude of different customised (PERSONALIZED) services in different environments;

Interference limitation studies, aimed at enhancing system performance, using "ad-hoc" interference limitation and power control techniques;

Channel Equalisation: considering that the HIPERLAN (HIgh PErformance Radio LAN) standard has adopted a constant envelope (GMSK) modulation which at 23.6 Mbit/s requires an equaliser for the indoor radio channel, research will be carried out on more efficient equaliser structures for higher order modulations.

The above studies will focus on (but not be limited to) mobile applications, in that also other potentially fast growing sectors will be properly examined, such as the radio in the local loop, in the perspective of a progressive convergence of wireless access technology and mobile radio.
 

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