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In this paper, the performance of a serially concatenated convolutional code (SCCC) is evaluated for high-bit-rate data transmission in a wideband multicarrier CDMA system. A multipath fading environment is considered with a typical mobile speed and interleaving schemes. Multistage successive interference cancellation is used to counter the problem of MAI in the uplink. Application of SCCC coding and interference cancellation has improved performance of the system significantly even in the fully loaded case. Downlink performance is also shown for comparison, both with SCCC and turbo code, indicating some relative merits of SCCC in achieving very low error rates with relative absence of error floor behavior at the typical BER rate of interest for wireless data applications.