In this paper, we develop two approaches for designing unitarily-constrained space-time block codes, which are suitable for communicating high-resolution information in layered multiple-input multiple-output broadcast channels. Unlike existing space-time codes, which are usually synthesized from standard phase-shift keying (PSK) or quadrature amplitude modulation constellations, the space- time codes proposed herein are designed using direct optimization over the unitary group. In comparison with conventional unitary space-time block codes, including Alamouti code with PSK constellations, the space-time codes generated by the proposed approaches exhibit significantly better performance, more favorable distance spectra and more effective utilization of the degrees of freedom that underlie the unitary group.

Additional Metadata
Persistent URL dx.doi.org/10.1109/GLOCOM.2014.7417496
Conference 58th IEEE Global Communications Conference, GLOBECOM 2015
Citation
Hussien, M.T. (Mohammad T.), Seddik, K.G. (Karim G.), Gohary, R, Shaqfeh, M. (Mohammad), Alnuweiri, H. (Hussein), & Yanikömeroǧlu, H. (2015). Space-time block codes over the stiefel manifold. In 2015 IEEE Global Communications Conference, GLOBECOM 2015. doi:10.1109/GLOCOM.2014.7417496