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.

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