COMBINED OFDM-CDMA CONFIGURATION FOR MULTIMEDIA WIRELESS APPLICATIONS

This paper analyses the applicability of OFDM modulation when combined with CDMA for multimedia wireless systems operating in an indoor envi ronment. We demonstrate the motivations and benefits deriving from thi s combination. Particular emphasis is given to channel equalisation te chniques, designed to face different problems arising in the up-link a nd in the down-link. In particular, an equalisation technique based on Channel Inversion, combined with carrier interleaving and adaptive su ppression of noisy carriers, is proposed in the down-link, while a pre -equalisation approach is used in the up-link. The analysis provides b oth EER performance and computational cost of the most important proce dures that are to be implemented within multimedia terminals. The comp utational cost analysis is carried out using commercial DSP platforms.