Date Added: Nov 2010
In this paper, the authors propose a Distributed Alamouti Space-Time Code (DASTC) for two-way relay networks employing a single Amplify-and-Forward (AF) relay. They first derive closed-form expressions for the approximated average sum-rate of the proposed DASTC scheme. Their analysis is validated by a comparison against the results of Monte-Carlo simulations. Numerical results verify the effectiveness of their proposed scheme over the conventional DASTC with one-way communication. Relay networking has been considered as an efficient approach to increase the communication range of wireless systems. However, dual-hop half-duplex relay networks lose half of the throughput compared to the direct communication due to the fact that the relay cannot transmit and receive simultaneously.