Our first experience with the simple and exciting idea of OFDM started in early 1991 with digital audio broadcasting (DAB). From 1992, our active participation in several research programmes on digital terrestrial TV broadcasting (DVB-T) gave us further opportunities to look at several aspects of the OFDM technique with its new advanced digital implementation possibilities. The experience gained from the joined specification of several OFDM-based demonstrators within the German HDTV-T and the EU-RACE dTTb research projects served as a basis for our commitment in 1995 to the final specifications of the DVB-T standard, relaying on the multi-carrier transmission technique. Parallel to the HDTV-T and the dTTb projects, our further involvement from 1993 in
the EU-RACE CODIT project, with the scope of building a first European 3G testbed,
following the DS-CDMA scheme, inspired our interest in another old technique, spread
spectrum, being as impressive as multi-carrier transmission. Although the final choice of
the specification of the CODIT testbed was based on wideband CDMA, an alternative
multiple-access scheme exploiting the new idea of combining OFDM with spread spectrum,
i.e., multi-carrier spread spectrum (MC-SS), was considered as a potential candidate
and discussed widely during the definition phase of the first testbed.
Our strong belief in the efficiency and flexibility of multi-carrier spread spectrum compared
to W-CDMA for applications such as beyond 3G motivated us, from the introduction
of this new multiple access scheme at PIMRC ’93, to further contribute to it, and to
investigate different corresponding system level aspects.
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