A repetitively coded multicarrier CDMA (RCMC-CDMA) transceiver for multiuser communications

This work proposes an approximately MAI-free OFDM transceiver, called the repetitively coded multicarrier CDMA (RCMC-CDMA), which uses the CDMA technique to separate different users so that every user can utilize the whole bandwidth and time slot simultaneously. We derive the capacity of the proposed system with multiple receive antennas, and then compare it to the capacity of the generalized MC-CDMA system. Furthermore, the proposal system is robust to timing mismatch between different users so that it is suitable for uplink transmission. Finally, we show that the system has a great potential to mitigate the carrier frequency offset (CFO) problem.