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In this paper, we propose a distributed Alamouti space-time code (DASTC) fortwo-way relay networks employing a single amplify-and-forward (AF) relay. Wefirst derive closed-form expressions for the approximated average sum-rate ofthe proposed DASTC scheme. Our analysis is validated by a comparison againstthe results of Monte-Carlo simulations. Numerical results verify theeffectiveness of our proposed scheme over the conventional DASTC with one-waycommunication.

Average Sum-Rate of Distributed Alamouti Space--Time Scheme in Two-Way Amplify-and-Forward Relay Networks