A concise review of the Space Time premise and its impact on modern wireless communication theory

In mid 90(s) researches of A. Paulraj\S. Kailath et al, E. Telatar and the historical research of G. Foschini\J. Gans ldquoOn Limits of Wireless Communications in a Fading Environment when Using Multiple Antennasrdquo; instigated a new era in the modern wireless communication. The research of G. Foschini\J. Gans led to what became defined as Space Time (ST) premise. Their study depicted mathematical models for optimizing spatial sharing of the physical link (channel capacity) through use of multi-element antenna MEA (space dimension). Use of space dimension opened new avenues to produce efficient coding and modulation techniques by exploring various combinations between spatial and the established time\frequency techniques. It has become a part of todays WCT necessities, that wireless designers acquire a profound understanding of this premise. This paper reviews the capacity limits in MEA channel, as expressed by G. Foschini\J. Gans and E. Telatar and the impact of their findings on succeeding developments in WCT field. The paper includes a brief description of two selected ST schemes; Multi-Input-Multi-Output with Orthogonal-Frequency-Division-Multiplexing (MIMO-OFDM) and a method to exploit the location diversity of Multiple Antenna Sites (MAS) for spatial multiplexing ldquoSFN-MAP-TDD-MIMO- OFDM techniquerdquo. Finally, paper predicts and discusses the next probable development roots in WCT.