Space-time reversal techniques for wideband MIMO communication

This paper presents a framework for space-time reversal (STR) techniques in wideband MIMO communication systems for both single- and multi-user scenarios. We initially develop and analyze the STR framework in a point-to-point system which serves as a foundation and benchmark for multiuser scenarios. We also investigate an iterative STR scheme and discuss its connections to communication on the eigen modes of the space-time channel. We then explore the applicability of STR techniques in a multiuser setting, both in the broadcast and multiple-access modes. We present an initial set of observations on the convergence of the iterative STR technique in multiuser scenarios and using insights obtained in the single user setting, we propose and compare two different signaling mechanisms for multiuser systems that reliably separate the transmissions to/from different users. The relevant metrics in all the above scenarios are quantified analytically and illustrated with realistic simulation results.