Space-time coding over a code division multiple access system

We discuss the usage of space-time coding with multi-antenna transmission for a DS/CDMA system. We have considered an L-multipath, M-mobile antenna system in which the base station has a phased N-antenna array (i.e. fading at the base station antennas is completely correlated). We have shown that for the considered DS/CDMA system, for the channel with no ISI, adaptive antennas, with optimized transmit vector, can be combined with space-time coding (e.g. delay-diversity coding) to achieve a diversity gain of ML and a large coding gain whenever N/spl ges/L.

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