Turbo-Coded Cooperative Diversity for CDMA System

In this contribution we study a range of turbo-coded cooperative diversity schemes in the context of a Code Division Multiple Access (CDMA) system. The cooperative diversity architectures considered are the Amplify-and-Forward (AF), Decode-and-Forward (DF) and Soft Relay (SR) schemes. We derived the soft-decision metric for the turbo decoder based on the Minimum Mean Square Error (MMSE) detection when considering the AF, DF and SR schemes. The effect of the relay position on the cooperative diversity system performance was studied. It was found that the AF-based turbo-coded CDMA system is the most attractive in terms of performance and complexity.

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