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The system under study is a convolutionally coded and orthogonally modulated DS-CDMA system over timevarying frequency-selective Rayleigh fading channels in multiuser environments. Iterative soft demodulation and decoding using the Turbo principle can be applied to such a system to increase the system capacity and performance. To combat multiple access interference (MAI), we incorporate the interference cancellation (IC) and decision-directed channel estimation (CE) in the demodulator. However,doi:10.1093/ietcom/e89-b.1.150 fatcat:s3twhs3ysjec5htolafcbexkze