%0 Conference Paper %A Abdurahman, F.M. %A Elazreg, A.M. %A Chambers, Jonathon %D 2011 %T Distributed quasi-orthogonal space-time coding for two-way wireless relay networks %U https://repository.lboro.ac.uk/articles/conference_contribution/Distributed_quasi-orthogonal_space-time_coding_for_two-way_wireless_relay_networks/9555860 %2 https://repository.lboro.ac.uk/ndownloader/files/17187740 %K Cooperative relay networks %K Distributed quasiorthogonal space-time block coding %K Space-time block coding %K Open-loop %K Exact phase feedback %K Mechanical Engineering not elsewhere classified %X Abstract—The contribution in this paper is to consider distributed quasi orthogonal space-time block coding (D-QO-STBC) for two-way (TW) wireless relay networks. In particular we exploit a two time slot protocol and both open-loop and closedloop D-QO-STBC with full cooperative diversity. In the openloop approach constellation rotation is exploited to improve performance, whereas two feedback terms are used in the closedloop schemes. Our end-to-end bit error rate simulations show that TW closed-loop D-QO-STBC and rotated open-loop D-QO-STBC are approximately 8 dB and 7.5 dB better than the distributed Alamouti TW approach at 10−4 bit error rate (BER), which confirms the advantage of four relay schemes in relay networks %I Loughborough University