While coding and signal processing are key elements to successful implementation of a
MIMO system, the communication channel represents a major component that determines
system performance. A considerable volume of work has been performed to characterize
communication channels for general wireless applications. However, because MIMO systems
operate at an unprecedented level of complexity to exploit the channel space-time
resources, a new level of understanding of the channel space-time characteristics is required
to assess the potential performance of practical multiantenna links....