Code division multiple access (CDMA) over frequency- selective fading channels faces challenges in suppressing multiuser interference (MUI). but can also benefit from the channel-induced multipath. diversity. On the other hand, uncoded orthogonal frequency division multiple access (OFDMA) is MUI-free by design, but faces challenges arising from, the fading-induced loss of multipath diversity. In this paper, we wed the advantages of CDMA with those of OFDMA. We design a group-orthogonal multi-carrier CDMA (GO-MC- CDMA) schem.e that minimizes MUI subject to the constraint that the full multipath diversity is enabled for all users. Each group of GO-MC-CDMA users shares a properly selected set of system subcarriers. MUI only exists among users in the same small-size group, which renders application of low-complexity multi-user detection per group, practically feasible. Simulation results illustrate the merits of GO-MJD-CDMA over competing multi-access alternatives.
|Original language||English (US)|
|Number of pages||6|
|State||Published - Dec 1 2002|
|Event||2002 MILCOM Proceedings; Global Information Grid - Enabling Transformation Through 21st Century Communications - Anaheim, CA, United States|
Duration: Oct 7 2002 → Oct 10 2002
|Other||2002 MILCOM Proceedings; Global Information Grid - Enabling Transformation Through 21st Century Communications|
|Period||10/7/02 → 10/10/02|