The new generation of wireless devices support higher data rates.
Most of the new standards like HSPA utilize the spatial
multiplexing of MIMO channels to achieve higher data rates, and
exploit the diversity of MIMO channels to provide better
performance. Hence there is an increased interest in the analysis
of MIMO communication systems. The eventual objective is to achieve
higher data rates in MIMO systems under the constraints of limited
bandwidth and power. The radio spectrum is a scarce resource, and
very expensive to license. Hence improved and efficient channel
utilization techniques are requisite, that exploit the radio
spectrum more proficiently. The multipath characteristics of the
environment cause the MIMO channels to be frequency selective. For
frequency selective deep fading, MIMO system remains ineffective.
OFDM, a multicarrier transmission scheme, is well recognized for
its potential for attaining high rate transmission over frequency
selective channels. It can transform such a frequency selective
MIMO channel into a set of parallel frequency-flat channels.
Implementing space resources based on OFDM i.e., MIMO-OFDM provides
higher data rate.
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