The purpose of this chapter is to outline the main possibilities and to show that the simultaneous requirement for wideband and multiple channels opens the way to new beamforming techniques and waveforms, where different signals are simultaneously transmitted in different directions, for jointly coding space and time, and coherently processed in parallel on receive. Such concepts, first proposed and demonstrated by S. Drabowitch and J. Dorey, should now be considered as mature techniques to be implemented in operational systems.
Space-Time Coding for Active Antenna Systems, Page 1 of 2
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