This paper presents a new multistage co channel interference cancellation algorithm for DS/CDMA system.By inserting known symbols into the information stream periodically

the pllot symbol aided channel estimation technique is used to facilitate the coherent demodulation of the reverse link.Interference signals are precisely reconstructed from the output of Viterbi decoder of the convolutional codes.By combining plot symbol alded channel estimation and convolutional codes

the residual error is reduced dramatically but the overall processing delay remains the same.Signal processing procedures and channel estimation algorithm are described along with the performance analyses of the proposed algorithm.Numerical results show that the proposed algorithm outperforms the conventional one.