Dual-antenna selection with distributed space-time block codes in two-way relaying networks

Based on the criterion of maximising the end-to-end receiving signal-to-noise power ratio, a dual-antenna selection scheme combining with distributed space-time block code is proposed for two-way relaying networks with amplify-and-forward protocol in Rayleigh fading channels. To facilitate the performance analysis, the authors derive the lower bound and asymptotic expressions for the network outage probability performance. Moreover, a concise solution for optimal power allocation is also determined to minimise the outage probability under a total power constraint. From the asymptotic outage probability analysis, the authors demonstrate that the proposed dual-antenna selection scheme can achieve full outage diversity. Finally, numerical results verify the accuracy of the authors' analysis. Notably, the proposed scheme achieves competitive performance improvement compared with the beamforming scheme and the existing antenna selection schemes in the state of the arts.