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In this paper, a new detection algorithm is proposed for turbo coded CodeDivision Multiple Access (CDMA) signals in detect and forward cooperativechannels. Use of user cooperation makes much improvement in the performance ofCDMA systems. Due to the special structure of CDMA systems, cooperative schemesincrease the sum and cutoff capacities of CDMA based wireless systems andimprove the quality of user-partner link which enhances the overall performanceof the system. In this paper, a new combining scheme is proposed that makes thereceiver more robust against the decision errors in the partner link. Thisstructure is simulated for punctured 1/2 rate 4 states turbo code in a channelwith first-order Markov time variation and different Rice factor variances.Through various simulations, it is shown when the channel estimates areavailable in the partner and receiver, the cooperation between users providesmuch diversity gain especially while using the new proposed combiningalgorithm.

A Novel Detection Algorithm Efficient for Turbo coded CDMA Signals in Detect and Forward Cooperative Channels