A new multistage interference cancellation (MIC) technique with diversity reception for QPSK asynchronous direct sequence code division multiple access (DS/CDMA) system over frequency-selective multipath Rayleigh fading channels is presented. Unlike the conventional MIC, which tries to subtract the lump sum of the multiple-access interference (MAI) and the self-interference (SI), the new MIC attempts to cancel the MAI and the partial SI, and to treat the residual SI as useful signal for symbol decision. In this technique, the Rake combining is employed so as to collect signal replicas over multiple fading paths. Upper and lower bounds for the bit error rates are derived relying on the Gaussian approximation. Further, the effect of the channel estimation error is studied. Analysis and simulation show that the new MIC can provide good performance, which is close to the ideal performance of single-user system, and outperforms the conventional MIC even in the presence of channel estimation error.
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