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The combination of OFDM and CDMA techniques is used in multicarrier CDMA (or OFDM-CDMA).  Such a technique is considered as a very likely candidate for future wireless systems because it marries the best of the OFDM and CDMA worlds and consequently, it can ensure good performance in severe multipath conditions.    There are various types of MC-CDMA systems and we have studied the performance and other aspects of these different MC-CDMA systems.  Combining schemes are used at the receiver for these various systems and their performance is studied using simulations.