Distributed Space-Time Coding in Two-Way Fixed Gain Relay Networks Over Nakagami-M Fading
The distributed Alamouti space-time code in two-way fixed gain Amplify-and-Forward (AF) relay is proposed in this paper. In particular, closed-form expressions for approximated ergodic sum-rate and exact Pair-Wise Error Probability (PWEP) are derived for Nakagami-m fading channels. To reveal further insights into array and diversity gains, an asymptotic PWEP is also obtained. Finally, numerical results are provided to corroborate the proposed theoretical analysis. Space-Time Codes (STC) for two-way relay networks have been recently considered for efficient transmission to achieve full diversity order and recover the loss in spectral efficiency inflicted by dual-hop transmission.