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Comparing the performance of coded multiuser OFDM and coded MC-CDMA over fading channels

The bit error rate of a coded Multiuser OFDM (M-OFDM) system and coded multicarrier CDMA (MC-CDMA) system with multiuser detection is analyzed. The paper focuses on downlink wireless applications, where the channel suffers from frequency-selective fading. We investigate both systems when long time interleaving is possible, though introducing large delays, and when time interleaving is limited. Bit error rate lower bounds and simulation results show that, when the system load is high, M-OFDM performs similar to MC-CDMA while its implementation is less complex as it does not require multiuser detection.