  In this paper multi-user detection techniques, such as Parallel and Serial
Interference Cancellations (PIC & SIC), General Minimum Mean Square Error
(GMMSE) and polynomial MMSE, for the downlink of a broadband Multi-Carrier Code
Division Multiple Access (MCCDMA) system are investigated. The Bit Error Rate
(BER) and Frame Error Rate (FER) results are evaluated, and compared with
single-user detection (MMSEC, EGC) approaches, as well. The performance
evaluation takes into account the system load, channel coding and modulation
schemes.
